TRADE TURNER st
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1 and 2 semester multiple choice question and answer
1. Which one of the following is not a part of the centre lathe? (a) Saddle
(b) Feed rod
(c) Arbor
(d) Lead screw
2. The headstock of a lathe is situated at the (a) Right-hand end of the lathe bed (c) Middle of the lathe bed
(b) Left-hand end of the lathe lathe bed bed
(d) Bottom of the lathe bed
3. The horizontal feed, cross feed and screw cutting movement in a lathe is controlled by (a) Headstock
(b)Tailstock
(c) Cross-slide
(d) Apron
4. A face plate is held at (a) Headstock spindle
(b) Tailstock
(c) Tool post
(d) Bed
5. Tumbler gear quadrant is used for (a) Increasing the speed of the spindle (b) Decreasing the speed of the spindle (c) Changing the direction direction of rotation of the lead screw (d) Changing the direction of the spindle 6. In a gap bed lathe, the gap is provided the nose of the headstock spindle (a) Just below the
(b) Just below the spindle of the tailstock (c) In the middle of the bed
(d) Anywhere in the bed
7. While drilling in lathe, the drill is held in the (a) Headstock
(b) Tailstock
(c) Compound rest
(d) Bed
8. Back-gear mechanism is provided in cone pulley headstock to (a) Reduce the speed of spindle (b) Increase the speed of spindle (c) Reverse the speed of spindle (d) Transmit power from spindle gear to stud gear
9. Lathe bed is made of (a) Mild steel
(b) Cast iron
(c) High carbon steel
(d) High alloy steel
10. To prevent lathe bed guideways from damaging by chuck while mounting (a) Take the help of the supervisor (b) Support it with screw jack (c) Lift it with hand crane (d) Place a wooden piece on the guideways
11. The sliding surfaces of the lathe bed are (a)Flame hardened
(c) Normalised
(b) Case hardened (d) Tempered
12. Which one of the following on a lathe is used u sed to give depth of cut? (a) Compound slide
(b) Top slide
(c) By adjusting the tool
(d) Cross slide
7. While drilling in lathe, the drill is held in the (a) Headstock
(b) Tailstock
(c) Compound rest
(d) Bed
8. Back-gear mechanism is provided in cone pulley headstock to (a) Reduce the speed of spindle (b) Increase the speed of spindle (c) Reverse the speed of spindle (d) Transmit power from spindle gear to stud gear
9. Lathe bed is made of (a) Mild steel
(b) Cast iron
(c) High carbon steel
(d) High alloy steel
10. To prevent lathe bed guideways from damaging by chuck while mounting (a) Take the help of the supervisor (b) Support it with screw jack (c) Lift it with hand crane (d) Place a wooden piece on the guideways
11. The sliding surfaces of the lathe bed are (a)Flame hardened
(c) Normalised
(b) Case hardened (d) Tempered
12. Which one of the following on a lathe is used u sed to give depth of cut? (a) Compound slide
(b) Top slide
(c) By adjusting the tool
(d) Cross slide
13. A tumbler gear unit consists of (a) One gear
(b) Two gears
(c) Three gears
(d) Four gears
14. The lathe bed has (a) One set set of 'V guideways and flatways flatways (b) Two sets of 'V guideways and flatways
(c) Three sets sets of 'V guideways and flatways flatways (d) Four sets of 'V guideways and flatways flatways 15. The cross-slide in a lathe moves (a) Parallel to the axis of rotation (b) At any angle to the axis of rotation (d) Either 'a' or 'b' Perpendicular Perpendicular to the axis of rotation
(c)
16. The carriage in a lathe moves (a) Parallel to the axis of rotation
(b) At any angle to to the axis of rotation rotation (c) Perpendicular to the axis of rotation (d) Either 'a' or 'b'
17. Which among the following parts of a lathe should have high compressive strength? (a) Bed
(b) Main spindle
(c) Lead screw
(d) Sliding gears in headstock
18. The compound slide swivel base is set at 45° to the centre line of lathe. The degree of the reading at the cross slide index will be (a) 135° (c) 45°
(b) 90° (d) 30°
19. The special gear of 127 teeth or 63 teeth may be used to cut metric threads in a lathe having British lead screw. It is known as (a) Idler gear
(b) Change gear
(c) Translating gear
(d) Compound gear
20. Which one of the following statements is true with respect to the half nut? (a) It is detachable part of the saddle saddle (b) It is an an integral integral part of the the saddle saddle (c) It is an integral integral part of the apron (d) It is detachable part of the the apron
21. What is the function of the drop worm provided in the apron of the centre lathe? (a) Engages / disengages the power feed (b) Changes the direction direction of rotation of the workpiece (c) Changes the feed direction (d) Engages / disengages the lead screw 22. The tailstock barrel has an internal taper. Which one of the following standard tapers is provided in the barrel bore? (a) Metric taper
(b) Morse taper
(c) Jorno taper
(d) Brown and Sharpe taper
23. A jib is provided between the top slide and t he swivel base assembly of the compound slide. Its purpose is to (a) Allowing dismantling the top slide easily (b) Eliminate the backlash of the screw and the nut in the assembly (c) Adjust the slackness developed due to to wear
(d) Permit flow of the lubricant between the sliding surfaces 24. One of the parts of a centre lathe is tumbler gear unit. It is provided to (a) Change the direction of feed
(b) Transmit motion from feed shaft to the carriage (c) Change the direction of rotation of the work (d) Alter the spindle speed 25. The graduations are marked at the base of the tailstock. To offset the body these graduations are given in (a) Degrees
(b) Taper per foot (d) Radians
(c) mm
26. The capacity of a lathe is expressed as (a) Horsepower and chuck diameter (b) Swing and distance between centres
(c) Bed length and spindle speed (d) Tool post size and lathe travel 27. The carriage of a lathe travels along which axis? (a) "B" axis
(b) "Z" axis
(c) "Y" axis
(d)"X"axis
28. The basic turning lathe is (a) Turret lathe (c) Engine lathe
(b) Automatic lathe (d) Swiss lathe
29 .Which one of the following is used to hold cylindrical rough casting for turning? (a) Three-jaw chuck
(b) Four-jaw chuck
(c) Collet chuck
(d) Magnetic chuck
30. Which one of the following centres is suitable while cutting taper by set over method? (a) Plain centre
(b) Half centre
(c) Ball centre
(d) Revolving centre
31. Which one of the following is used to hold the workpiece for machining diameter concentric to its hole / bore? (a) Face plate
(b) Mandrel
(c) Three-jaw chuck
(d) Four-jaw chuck
32.Which among the following centres is suitable when workpiece held between centres is to be turned at high speed? (a) Ball centre
(b) Half centre
(c) Pipe centre
(d) Revolving centre
33. The included angle of live centre nose is (a) 30°
(b) 45°
(c) 60°
(d) 90°
34. A lathe half centre is used (a) To support the workpiece always (b) To turn long workpiece (c) Because it is easy to lubricate the workpiece (d) To face the workpiece upto the end of the centre hole
35. Dead centre, as compared with the live centre, bears or resists (a) No friction
(b) Equal friction
(c) Less friction
(d) More friction
36.The size of three-jaw chuck is specified by (a) The size of each jaw (b) The thickness of each jaw (c) The diameter of the body of the chuck (d) Width of the body of the chuck
37.Which type of holding device is suitable for holding eccentric job (a) Three-jaw chuck
(b) Four-jaw chuck
(c) Faceplate
(d) Magnetic chuck
38. A follower steady consists of (a) One pad
(b) Two pads
(c) Three pads
(d) Four pads
39. A follower steady is fixed on the (a) Tailstock
(b) Bed
(c) Saddle
(d) Headstock
40.The taper provided in the nose of the tailstock barrel is (a) Morse taper
(b) Jarno taper
(c) Brown and Sharpe taper
(d) Metric taper
41.An irregularly shaped wotkpiece is turned on a lathe. Which one of the following work holding accessories is used? (a) Three-jaw chuck
(b) Two-jaw chuck
(c) Driving plate
(d) Faceplate
42.Which taper is used on spindle nose of the lathe headstock? (a) Jarno taper (c) Pin taper
(b) Brown and Sharpe taper (d) Morse taper
43.What is the advantage of tailstock spindle having left-handed threads? (a) Avoid advancement of barrel when rotated clockwise (b) Ensure that the barrel advances with clockwise movement of hand wheel
(c) Reduce the tendency for excessive movement of the barrel (d) Avoid jamming of spindle and hand wheel 44.Which among the following is NOT the feature of tailstock?
(a) It holds the job.
(b) Drills and reamers can be mounted on it. (c) Dead centre is mounted on its spindle. (d) It can be used for taper turning by offset method. 45.Which one of the following tool posts is easy for setting the tool centre height of the tool in a lathe? (a) Open side tool post
(b) Single screw tool post
(c) Four-way tool post
d.
universal tool post
46.An angular workpiece is to be faced. It should be mounted (a) In a three-jaw chuck
(b) In a collet
(c) Between centres
(d) On a face plate
47. Scroll and gear mechanism is employed in (a) Three-jaw chuck
(c) Magnetic chuck
(b) Four-jaw chuck (d) Collet chuck
48.Which among the following materials is used for steady rest pads? (a) Mild steel
(b) Lead
(c) Brass
(d) Aluminium
49.Which among the following statements in respect of fixed steady is NOT correct? When setting its two lower pads are made to just touch the surface of the job first. It must be trued before the pads to bear on the jo b. (c) Skinning is done on the job before it is set with the job. (d) It is fixed to the carriage of the lathe.
50.A fixed steady has (a) One adjustable pad
(b) Two adjustable pads
(d) Four adjustable pads
(c) Three adjustable pads
51.During machining operation using faceplate, the angle plate is held on the (a) Faceplate '
(b) Carriage
(c) Tailstock
(d) Bed
52.Which one of the following methods is used to press the mandrel squarely to the workpiece? (a) By hammering
(b) By arbor press
(c) By tailstock
(d) By vice
53.Tool maker's buttons are used for (a) Aligning the workpiece for boring to a given datum
(b) Setting the tool at correct centre height (c) Adjusting the slackness in the guideways of cross-slide (d) Holding the workpiece firmly 54.A faceplate is used for turning (a) Regular shaped jobs (c) Flat jobs
(b) Irregular shaped jobs
d) None of the above
55 .Which among the following statements is NOT correct? A faceplate is similar to the magnetic chuck. For accurate setting of the job on the faceplate, dial test indicator is used. To check the balance of the faceplate work, spindle drive should be disconnected. V-block is required to hold the cylindrical job on face plate.
56..‘V’ groves of cast iron pulley have to be fine turned. Which one of the following work holding methods gives the highest concentricity? (a) Holding between a four-jaw chuck and a revolving centre.
(b) Holding between a three-jaw chuck and supporting with a pipe centre. (c) Holding on a split mandrel and machining between centres. (d) Holding on cone mandrel and machining between centres. 57.When machining an irregularly shaped workpiece held in faceplate, counterbalancing is done by clamping weights. This is done Before mounting the faceplate on the spindle nose. After mounting the faceplate on the spindle nose and revolving the workpiece at the slowest rpm. After mounting the faceplate on the spindle nose and keeping the spindle in neutral position.
After taking the rough cut. 58.A fixed steady rest is used to Support the tool rigidly to avoid chatter during operation. Support long shafts that are being threaded for their full length. Support workpieces during facing large diameter workpieces with short length. Support long workpieces held in chuck, to perform operations at the overhanging end.
59.You want to fix an irregularly shaped workpiece on a lathe, which one of the following accessories is the most appropriate? (a) Three-jaw self-centering chuck (b) Driving plate (c
face plate
(d) Catch plate 60.The fingers of a fixed steady rest are set to support a lengthy workpiece held in a four-jaw chuck. The fingers are adjusted and set when the workpiece is Trued to the chuck and the work is stationary. Trued at the tailstock and when the work is running at slow rpm.
Trued at both ends and work is stationary .
Trued at both ends when the work is running at slow rpm. 61.A traveling steady is fixed at the saddle of a lathe. What is the function of this steady rest? To prevent bending of long shafts due to cutting force.
To avoid load on the lathe centres while turning long shafts. To reduce the load on the cutting tool while turning. To ensure to turn at higher cutting speeds than recommended. 62..The matching scroll threads on the back faces of the chuck jaws of a concentric chuck are Equal in numbers but unequal in pitch. Unequal in numbers but equal in pitch. Unequal in numbers and unequal in pitch. Equal in numbers and equal in pitch. 63.A split bearing bush which has its two halves soldered, is held in a four -jaw independent chuck for machining. Which one of the following defects will result if the work is not held by the two opposite jaws on soldered points (a) Truing at the chuck end is not possible. (b) Soldering will give way and the two halves will be separated. (c) Bored hole not concentric with outer dia. of the bush. (d) Bored dimensional accuracy cannot be obtained. 64.Which one of the following tool angle is provided to avoid rubbing of the body of the tool with the workpiece? (a) Rake angle
(b) Helix angle
(c) Clearance angle
(d) None of the above
65.The negative rake angle is generally provided on the tool made of (a) High speed steel
(b) Tool steel
(c) Tungsten carbide
(d) High carbon steel
66.Which one of the following is used only for finishing and maintaining correct form of thread ? (a) Tap
(b) Threading tool
(c) Threading chaser
(d) Tipped tool
67.The chip breaker on a lathe tool is essential when (a) Turning soft material (b) Turning ductile materials and to break the chips (c) Turning cast iron (d) Turning hardened materials 68.A tool, which is used to enlarge a previously drilled hole is known as (a) Facing tool
(b) Turning tool
(c) Form tool
(d) Boring tool
69.What effective change will occur to the tool geometry if the cutting tool is set below the centre height on lathe? (a) front clearance angle increase (b) Front clearance angle decreases (c) Front clearance angle remains the same (d) Front clearance angle becomes zero 70.Inserted HSS tool bits are more useful for the operation (a) Boring (c) Internal threading
(b) External threading (d) All the above
71.Which one of the following materials is used for manufacturing centre drills ? (a) Cast steel
(b) Mild steel
(c) High speed steel
(d) Cast iron
72.Which among the following statements in respect of chasers is correct ? Chaser is a single point cutting tool Cutting threads by a chaser is slower process than that by a single point tool Cutting threads by chaser gives better finish The same chaser can be used for cutting any pitch of thread irrespective of the type of chaser used 73.Which among the following statements in respect of the lathe cutting tools is correct ? Red hotness temperature is higher for high carbon steel tool than that of carbide tool
The property of tool chipping off with vibration is more for cemented carbide tools than that of HSS tools Ceramic tool has more resistance to shock as compared to HSS tool HSS tool can work at more spindle speed and feed than cemented carbide tool 74.In the parting off tool which angle will help the tool to penetrate into the work without rubbing at the sides ? (a) Top rake angle
(b) Front clearance angle
(c ) Side clearance angle
(d) Back clearance angle
75.Which among the following statements in respect of chip breakers is correct ? Chip breakers are essential for breaking the long continuous chips into small pieces Chip breakers are necessary to break the chips to protect the finished work surfaces Chip breakers are provided to curl and break the chips All the above
76.Helix angle is found on (a) feed rod of lathe
(b) threading tool
(c) threaded workpiece
(d) taper turning attachment
77.The width of the tool used to cut 10 mm pitch square thread iss
(a) 10 mm
(b)7.5mm
(c) 5 mm
(d) 2.5 mm
78.The included angle of the countersinking portion of a centre drill of type 'B' used for protecting the centre hole is (a) 75°
(b) 90°
(c) 100°
(d) 120°
79.Which one of the following factors will NOT influence the selection of the cutting speed ? (a) Diameter of the workpiece
(b) Workpiece material
(c) Tool material
(d ) Operation to be performed
80.Which one of the following angles of rough turning tool, depends upon the feed rate chosen ? (a) Top rake angle
(b) Side rake angle
(c) Front clearance angle
(d) Side clearance angle
81.The size of the centre drill is selected on the basis of the (a) length of the workpiece
(b) material of the workpiece
(c) diameter of the workpiece (d) operation to be performed on the workpiece 82.Taps are surface treated to (a) improve the appearance (b) improve the wear resistance property (c) prevent them from getting corroded (d) be used only on automatic threading machines 83.Chip breakers are meant to break continuous long chips. Which one o f the following types of chip breakers is found on a throw away insert with holder ? (a) Piece of sheet metal clamped to the holder in the path of the coil (b) A step is ground on the throw away insert along the cutting edge
(c) A small groove ground at the cutting edge (d) A carbide bit is screwed and held on the top face of the bit
84.To enable a nut to fit properly on a bolt of square threads, the width of the internal square threading tool should be (a) slightly more than the half pitch (c) equal to the half pitch
(b) slightly less than the half pitch (d ) equal to the pitch
85. The tip of a cemented carbide tool is joined on the shank by (a) welding
(b) brazing
(c) soldering
(d) clamping with a screw
86. Which one of the following materials for lathe cutting tools can be forged to any de sired shape ? (a) High speed steel
(b) High carbon steel
(c) Stellite
(d) Tungsten carbide
87. when rough turning a workpiece with a carbide tool long curly chips are formed. Which one of the following is the right way of getting rid of this kind of chip ? (a) Stop the power feed at intervals so that the chip breaks (b) Change the rake angle (c) Provide chip breaker on the tool (d) Use a metal hook and pull away the chips 88.A brass shaft is to be turned to a surface roughness Ra = 0.8, with high cutting speed. Which one of the following cutting tool materials is most suitable ? (a) High speed steel
(b) High carbon steel
(c) Low alloy steel
(d) Cemented carbide
89..Which one of the following statements is true with reference to the tool life ? (a) Time between starting and finishing a job (b) Total time for turning work including regrinding of tool
(c) Time between two successive regrinds (d) Time between starting of metal cutting and tool wear out 90.A carbide tipped tool with blue marking is used on a lathe. Which on e of the following materials can be machined with this tool ? (a) Brass
(b) Steel
(c) Plastic
(d) Grey cast iron
91.Hand chasers are used for (a) quick production of threads (b) cutting threads on soft metal directly (c) rectifying threads cut on steel rods which are distorted (d) rectifying crest and root of threads formed by single point tool 92.Which one of the following is the correct position of threading tool to cut V-thread? Exactly at centre height of the workpiece with tool axis perpendicular to the workpiece axis
Exactly at centre height of the workpiece with tool axis at 60° to the workpiece axis Exactly at centre height of the workpiece with tool axis at 45° to the workpiece axis Exactly at centre height of the workpiece with tool axis at 30° to the workpiece axis 93.Which among the following statements is suitable to get better finish by turning ? (a) Increase the speed and feed (b) Reduce the speed and feed (c) Increase the speed and reduce the feed (d) Increase the feed and reduce the speed 94.For plain turning a 60 mm diameter workpiece using HSS tool with recommended cutting speed of 30 metre / min., the rpm should be (a) 80 rpm
(b) 159 rpm
(c) 192 rpm
(d) 318 rpm
95.Which among the following factors governs the selection of feed when turning a workpiece ? (a) Tool geometry
(b) Surface finish required
(c) Type of coolant required
(d) All of the above
96.Which one of the following shoulders is used on components to be threaded ? (a) Square shoulder
(b) Radius shoulder
(c) Undercut shoulder
(d) Beveled shoulder
97.State the direction of rotation of job and lead screw while cutting left hand thread viewing from tailstock end. (CW = clockwise; ACW = anticlockwise). (a) Both the job and lead screw rotate CW (b) Both the job and lead screw rotate ACW (c) Job rotates CW and lead screw rotates ACW (d) Job rotates ACW and lead screw rotates CW
98.Fine facing is done by feeding the tool (a) from centre to the periphery of the job
(b) from periphery to the centre of the job (c) either 'a' or 'b' (d) neither 'a' nor 'b' 99.Which one of the following types of chips is found while turning cast iron ? (a) Long curly chips
(b) Segmental chips.
(c) l-shaped chips
(d) Spiral chips
100. While step turning, it is preferred to turn first (a) small diameter step
(b) large diameter step
(c) either 'a' or 'b'
(d) neither 'a' nor 'b'
101.As the diameter of the workpiece decreases, the spindle speed (for the same cutting speed) A) increase
(b) decreases
(c) remains the same
(d) none of the above
102.The difference in measurement between the machined and un-machined diameter is equal to the (a) depth of cut
(b) ½ depth of cut
(c) 2 x depth of cut
(d) none of the above
103.Centre drilling should be done at (a) higher rpm with a slower feed
(b) higher rpm with a higher feed
(c) slower rpm with a higher feed
(d) slower rpm with a slower feed
104.Which among the following is the cause for incorrect pitch of thread during threadcutting with single point tool? (a) Incorrect selection of change gears (c) Half nut worn out
(b) Lead screw worn out (d) Any one of the above
105.Which one of the following is the reason for torn threads while thread cutting on lathe ? (a) Blunt tool
(b) Heavy depth of cut
(c) Insufficient side clearance
(d) Any one of the above
106.For setting of tool for threading, it is aligned with the work by using (a) try square (c) thread plug gauge
(b) centre gauge
(d) template
107.Which among the following statements in respect of threads/ thread cutting is NOT correct ? Threading tools are checked for accuracy for the 60° angle by using a centre gauge M 10 x 1.25 is a fine pitch thread M 10 is a coarse pitch thread Same tool is used for cutting external and internal threads
108.While cutting internal threads on lathe with single point tool, the spindle speed should be less than that for the plain turning operations more than that for the plain turning operation equal to that for plain turning operation None of the above 109.Which one of the following statements in respect of thread cutting is NOT correct? Inserted tool bits are more advantageous while cutting internal threads Before cutting internal threads, the hole should be chamfered When internal thread cutting is done in a blind hole, a recess should be provided When cutting internal threads, the core diameter may be equal to the size of external threads 110.Which among the following in respect of thread cutting is NOT correct ? The threads can be cut on a lathe by using simple gear train arrangement only The 127 teeth gear is used as driven gear for cutting metric threads on a lathe having lead screw in TPI The 63 teeth gear is used as a driver for cutting British threads on a lathe having metric lead screw The teeth of the driver and driven are based on t he pitch of thread to be cut and the pitch of thread on lead screw 111.Which one of the following statements in respect of eccentric turning is correct ? In an eccentric shaft, the centres of the individual diameters are displaced Eccentric shaft can be turned by holding it in a three-jaw chuck Higher speed is chosen for eccentric turning It is preferred to give more depth of cut in the beginning while turning an eccentric shaft 112.Which one of the following statements in respect of thread chasing dial is NOT correct ? (a) Thread chasing dial is used to catch the thread when threading on lathe (b) Worm gear of chasing dial engages with the lead screw while thread chasing
(c) Thread chasing dial is an additional part of the lathe carriage (d) Thread chasing dial stops rotating when the half nut lever is engaged 113.If the pitch to be cut is 2.5 mm and the lathe has 5 mm pitch lead screw, the thread chasing dial has 8 divisions and a 16 teeth worm wheel fitted on it, the engagement of half nut should be (a) only at one particular position (b) only at numbered or un-numbered division (c) at opposite position
(d) anywhere
114.Which among the following statements is correct ? During turning, after giving one depth of cut, the diameter is reduced equal to double the depth Carbide tipped tool can withstand shock load When turning bigger diameter job, the rpm is proportionally increased When turning smaller diameter job, the rpm is proportionally decreased 115.A 24-teeth gear is fixed at stud as driver gear. After completion of first start and before starting of second start, the driver gear should be turned (a) 24 teeth
(b) 18 teeth
(c) 12 teeth
(d) 6 teeth
116.A simple gear train is to be used to cut a thread with a certain pitch. A driver gear with 3 teeth more than that of the calculated value is mounted due to the nonavailability of the required gear from the set. The thread that is cut will have the pitch More than that required throughout the length Less than that required throughout the length Equal to that required throughout the length More for a certain length and then less for the remaining length 117.Power feed is not possible in compound slide method of taper turning. Which one of the following defects can be noticeable on the tapered workpiece due to the above reason ? (a) Chatter (c) Taper angle more than set
(b) Poor surface finish (d) Taper angle less than set
118.To get a fine even surface on a workpiece b y facing operation on lathe, it is necessary to have (a) low cutting speed, fine feed and heavy depth of cut (b) low cutting speed, fine feed and light depth of cut (c) high cutting speed, fine feed and light depth of cut (d) high cutting speed, fine feed and heavy depth of cut 119.Which one of the following operations is NOT done on a workpiece held in-between centres ? (a) Knurling
(b) Undercutting by plunging
(c) Thread cutting
(d) Parting off
120.Which one of the following methods of catching the threads consumes more time when cutting odd pitch threads ? (a) Using thread-chasing dial (b) Reversing the machine (c) Marking the work holding device and lead screw (d) Pre-determined travel of the carriage 121.A hole is drilled in a lathe by using a 10 mm dia straight shank drill held in a drill chuck. After a short distance of the drill travel, it rotates along with the work. Which one of the following is the cause for this defect ? (a) Chips getting clogged (b) Centre not aligned (c) Spotting at the centre not done (d) Feeding by tailstock hand wheel is too slow 122.Unusual sound is heard during rough boring a large diameter hole. Which one of the following statements is the cause for this defect ? (a) Boring tool springs its travel (b) Coolant is not applied with force
(c) Tool set below centre (d) No secondary clearance ground on the front cutting edge 123.A workpiece is chamfered to remove burrs. It is observed that the chamfer width is not uniform throughout the periphery of chamfer on a workpiece. Which one of the following is the cause for this defect? (a) The angle of chamfering is not correct (b) The chamfering tool not set square to the work axis (c) The work face not running true (d) The overhang of the tool is too much 124.By which one of the following, a multi-start thread is cut on a lathe ? (a) By a chaser
(b) By a die head
(c) By a single-point tool
(d) By a split die
125.If the lead screw has 6 TPI and there are 4 numbered divisions in the chasing dial, which one of the following will be the teeth worm wheel of chasing dial ? (a) 48 teeth
(b) 24 teeth
(c) 18 teeth
(d) 12 teeth
126.While thread cutting on a lathe by using single-point tool, the tool moves in a path called as (a) Epicycloid (c) Rake
(b) Cycloid (d) Helix
127.Which one of the following diameters of the workpiece should be turned before cutting external threads ? (a) Major diameter
(b) Core diameter
(c) Pitch diameter
(d) Head diameter
128.When the threading tool reaches the end of the thread, the tool should be (a) left in the groove and reverse the workpiece
(b) withdrawn after stopping the machine (c) withdrawn while the tool is taking cut (d) withdrawn after removing the workpiece 129.A shaft of 50 mm has to be rough turned to 0 42 mm in one pass. When will you check to ensure the set depth of cut is correct ? (a) After the tool traveled the full length (b) After the tool traveled half way (c) Just after the cut is taken at the tailstock end
-
(d) After the tool has traveled a distance more than the angular shoulder 130.A M30 thread is rough cut using a thread roughing tool. Which one of the following is the correct procedure for aligning the finishing tool with the thread groove ? Work stationary, tool adjusted and positioned in the groove by compound slide and cross slide Work stationary, tool adjusted and positioned in the groove by carriage hand wheel and cross slide hand wheel Work revolving, half nut engaged, tool positioned in the groove by compound slide and cross slide Work revolving, half nut engaged, tool positioned in the groove by carriage and cross slide hand wheels 131.Which one of the following is a remedial measure to prevent the tool cutting edge chipping off? (a) Increase feed rate
(b) Reduce cutting speed
(c) Decrease nose radius
(d) Use negative top rake
132. The distance through which a screw thread advances axially in one turn is called: (a) Pitch of thread
(b) Lead of thread
(c) Depth of thread
(d) Diameter of thread
133.The pitch of 3-start thread is the lead divided by (a) 1
(b) 2
(c) 3
(d) 4
134..the angle of I.S. thread (V-shaped) is (a) 29° (c) 50°
(b) 471/2° (d) 60°
135.what type of threads are suitable for small precision components and measuring gauges ? (a) British Association threads
(b) Whitworth Screw threads
(c) Acme threads
(d) Square threads
136.What type of threads are suitable for lead screws of machine tools ? (a) British Association threads
(b) Whitworth Screw threads
(c) Acme threads
(d) Square threads
137.Which one of the following is the reason for rough and broken threads ? (a) Thread cutting tool blunt. (b) The size of hole or diameter of the blank for bolt is not correct. (c) The flutes of cutting tool are filled with chips. (d) All the above. 138. The distance between one point on a screw thread and the corresponding point on the next thread, measured parallel to the axis is called as (a) Axis of thread (c) Pitch of thread
(b) Depth of thread (d) Lead of thread
139.In a single start thread (a) Lead and pitch are equal
(c) Pitch is double the lead
(b) Lead is double the pitch (d) Lead is half the pitch
140.Which one of the following screw thread forms has an included angle of 29° between the flanks of thread ? (a) B. A. thread
(b) Acme thread
(c) Buttress thread
(d) Knuckle thread
141.The pitch diameter of the external screw thread is checked by (a) Screw pitch gauge
(b) Thread ring gauge
(c) Screw thread micrometer
(d) Vernier caliper
142.A screw thread is formed on a cylindrical surface by cutting (a) Helical grooves
(b) V-grooves
(c) Square grooves
(d) Half round grooves
143.The root of ISO metric thread is (a) Flat (c) Sharp corner
(b) Round
(d) None of the above
144.Which one of the following thread forms is used in a threaded assembly where the sliding force acts in one direction only ? (a) Square thread
(b) V thread (d) Knuckle thread
(c) Saw-tooth thread
145.B.S.F. screw threads have the included angle of (a) 30°
(b) 45°
(c) 55°
(d) 60°
146.The depth of B.A. screw thread is (a) 0.64 P
(b) 0.7035 P
(c) 0.6 P
(d)0.61 P
147.The pitch diameter of a screw thread is the (a) Nominal diameter of the rod (b) Imaginary diameter in between the major and minor diameter of the thread
(c) Minimum diameter of the thread (d) Maximum diameter of the thread
148.B.S.F. screw threads are generally used for (a) Ordinary bolts and nuts
(b ) Electrical goods
(c) Lathe lead screw
(d) Vice spindle
149.Which one the following threads, is used on mechanical jack? (a) Acme
(b) Square
(c) Buttress
(d) B.S.F.
150.Screw threads are produced without metal removing by a process called as (a) Thread cutting (c) Thread rolling
(b) Thread chasing (d) Tapping
151.Which one of the following thread forms on bolts and nuts is meant for general fastening purposes ?
(a) 'V’ threads (c) Knuckle threads
(b) Square threads (d) Acme threads
152.Which one of the following screw thread elements is NOT checked with the thread ring gauge ? (a) Pitch diameter
(c) Helix angle
(b) Pitch (d) Profile
153.Which one of the following elements of an external screw thread cannot be measured directly with precision instruments ? (a) Width of crest
(b) Minor diameter
(c) Major diameter
( d) pitch diameter
154.Which one of the following statements is correct with respect to the spiral fluted taps ? (a) Used to tap oversized hole
(b) Used to tap holes with slots
(c) The tap tends to push the chips ahead of the tap (d) Threads formed by displacing the work material 155.The shape of the frame of thread snap gauge is in the form of
(a) Round
(b) Square
(c) 'Y' type
(d) "C" type
156.The shape of the thread in the 'Not Go' end of a thread snap gauge is (a) Beveled
(b) Truncated
(c) Taper
(d) Sharp
157.The handle of thread plug gauge is made from ebonite material for (a) reducing the cost
(b) reducing the weight
(c) easy manufacturing
(d) easy handling
158.Which one of the following thread groups is only for transmitting motion ? (a) Square, Modified square, Acme, Buttress threads (b) Whitworth, Acme, Square, Buttress threads (c)
Unified, Acme, Square threads
(d) ISO Metric, Modified Square, Acme threads 159.Buttress threads are most commonly used for (a) Transmission of motion
(b) Resisting force exerted in one direction only
(c) Positioning of mechanical parts
(d) Special bolts and units in structural work
160.While threading on lathe, the carriage is moved by means of (a) Lead screw
(b) Hand wheel
(c) Feed rod
(d) Gear train on a rack
161.The depth of Indian Standard (BIS) thread is (a) 0.6495 P
(b) 0.6000 P
(c) 0.6403 P
(d) 0.6134 P
162.Threads are cut on a lathe with a single point tool by (a) Setting the correct speed
(b) Setting on cut for the full depth of the thread. (c) Making a series of cuts in the same cut. (d) Moving the carriage by means of rack. 163.Which one of the following thread forms is mostly found on threaded shaft of lifting equipment for carrying loads? (a) V thread
(b) Square thread
(c) Saw tooth thread
(d) Knuckle thread
164.In a threaded assembly the contact between the male and female threads takes place on the (a) Pitches
(b) Flanks
(c) Crests
(d) Roots
165.Dressing and truing of a grinding wheel are (a) exactly the same operation (b) done with the same equipment (c) done only for coarse grinding wheels (d) only for form grinding wheels 166.A hardened die block (work) has to be ground. It is required to retain the same hardness even after grinding. If the work is overheated in the grinding process, it may result in work being rejected or scrapped. Probable reason for rejection is that the work surface is (a) discoloured (c) rough
(b) softened (d) brittle
167.What is the trouble when grinding wheel fails to cut in a grinding machine ? (a) Grinding wheel's grade is too soft
(b) Grinding wheel is glazed
(c) Grinding wheel is not securely mounted on spindle (d) Too much feed is given 168.The depth of infeed per pass in dressing a grinding wheel should be not more than (a) 0.25 mm
(b) 0.025 mm
(c) 0.0025 mm (d) 0.00025 mm 169.The 169.grade of a grinding wheel is specified by letters from A to Z. Which are of the following refers to the hardest grade? (a) E
(b) J
(c) P
(d) Y
170.It is required to finish grind a 050 mm mild steel shaft on a c ylindrical grinding machine. What will be the surface speed if r.p.m. of the job is 191 ? (a) 20 metres/min.
(b) 25 metres/min.
(c) 30 metres/min. (d) 35 metres/min. 171.Which among the following is the natural abrasive ? (a) Corrundum
(b) Diamond
(c) Emery
(d) All of the above
172.Which one of the following range of carbon content is present in pig iron? (a) 0.05 to 1.4%
(b) 0.9 to 1.4%
(c) 1.7 to 2.2%
(d) 3 to 5%
173.What is the name of the furnace, which is used for the manufacture of C.I. ? (a) Open hearth
(b) Cuploa
(c) Bessemer
(d) Puddling
174.The main product of puddling furnace is (a) Cast iron
(b) Wrought iron
(c) Cold rolled steel
(d) Hot rolled steel
Pig iron is product of (a) Cuploa furnace
(b) Blast furnace
(c) Open hearth furnace
(d) Electric arc furnace
Which one the following processes can produce high alloy steel with accurately specified chemical composition?
(a) Bessemer process (c) Electric arc process
(b) Open hearth furnace (d) Crucible process
A black malleable cast iron (a) Is a raw casting (b) Can be worked with hard cutting tools (c) Which through malleablizing and is decarburized at the outer skin (d) Is steel cast in moulds. Which one of the following elements, influences most of the forgeability of steel ? (a) Silicon
(b) Manganese
(c) Carbon
(d) Nitrogen
In case of steel, through which one of the following processes, there will be no increase in hardness ? (a) Heating above 600°C and slow cooling
(b) Rolling
(c) Hammering
(d) Alloying with chromium
Grey cast iron has (a) High compressive strength
(b) Low compressive strength
(c) High tensile strength
(d) Low tensile strength
Main alloying element in H.S.S. is (a) Tungsten
(b) Chromium
(c) Vanadium
(d) Nickel
Carbon percentage in HSS tool is (a) 0.75 to 1.00%
(b) 1.00 to 2.00%
(c) 0.60 to 0.75%
(d) 0.20 to 0.30%
The commonly used proportions of alloying elements in HSS are
(a) 18% tungsten, 4% chromium and 1% vanadium
(b) 18% chromium, 4% tungsten and 1% vanadium (c) 18% vanadium, 4% chromium and 1% tungsten (d) 18% cobalt, 4% chromium and 1% vanadium Grey cast iron is (a) Malleable
(b) Ductile
(c) Tensile
(d) Rigid
Which one of the following metals has less carbon content? (a) Plain carbon steel
(b) Wrought iron
(c) Pig iron
(d) Cast iron
A brass shaft is to be finish turned to a surface roughness Ra = 0.8, with high cutting speed. Which one of the following cutting tool materials is suitable for this purpose? (a) H.S.S.
(b) High carbon steel
(c) Low alloy steel
(d) Cemented carbide
A solid forged boring tool is made of (a) H.S.S.
(b) Tungsten carbide
(c) Stellite
(d) Cast iron
Solid milling cutters are manufactured from (a) Sintered carbide
(b) H.S.S.
(c) Ceramic
(d) Stellite
Which one of the following is an alloy of iron and carbon? (a) Pig iron
(b) Cast iron
(c) Wrought iron Lubricant is necessary to (a) Run the machine smoothly taking least load.
(d) Steel
(b) Run the machine quickly. (c) Stop the machine immediately. (d) Produce workpiece of greater accuracy. The general ratio of soluble oil and water used as coolant is (a) 10:1
(b) 1:10 (d) 20:1
(c) 1:20
The best example for semi-liquid lubricant is (a) Grease
(b) Graphite
(c) Castor oil
(d) Lard oil
Best example for gravity feed lubrication is (a) Grease gun
(b) Ring lubricator
(c) Tell-tale lubricator
(d) Wick feed lubricator
Most common type of cutting fluid used in almost all the machining operation is (a) Water (c) Soluble oil
(b) Lard oil (d) Compressed air
Fire point is The temperature at which an oil gives off sufficient vapour to burn it continuously when ignited. The temperature at which an oil will cease to flow when cooled. The lowest temperature at which an oil gives off sufficient vapour to support a momentary flash without actually setting fire. The temperature at which fire is produced. Graphite is a (a) Liquid lubricant
(b) Semi-liquid lubricant
(c) Solid lubricant
(d) None of the above
The best example for splash lubrication is (a) Ring lubricator
(b) Wick feed lubricator
(c) Grease gun
(d) Pump lubricator
Slideways of a machine are frequently lubricated by (a) Oilcan (c) Ring lubricator
(b) Grease gun (d) Wick feed lubricator
Which one of the following is the reason that tap water is not preferred as coolant on machine tools? (a) It decreases cutting action of the tool. (b) Danger of corrosion. (c) It has insufficient cooling effect. (d) Due to high cooling effect the cutting edges of tool break off. Which one of the following frictions occurs in an un-lubricated journal bearing ? (a) Sliding friction
(b) Rolling friction
(c) Fluid friction
(d) Dry friction
In which one of the following materials no cutting oil is used when drilling ? (a) Tool steel
(b) Grey cast iron
(c) Copper
(d) Aluminium
Preventive maintenance is The overall lubrication and repair work carried out by the maintenance section in advance of the machine coming to breakdown. The maintenance work for any fault noticed during the work. Done to prevent the maintenance of machines. None of the above. For effective cutting of steel with hand hacksaw, which one of the following coolant is suitable?
(a) Cutting oil
(b) Grease
(c) Lard oil
(d) Kerosene oil
Leveling bolts are used for (a) Supporting the load for machine
(b) Adjusting the height of machine
(c) Rigidity of machine
(d) None of the above
Which one of the following tests is carried out after overhauling and reconditioning of machines ? (a) Periodic acceptance test
(b) Geometrical test only
(c) Performance test only
(d) None of the above
The permissible deviation for leveling of machine is (a) 0.03/100 mm
(b) 0.03 / 200 mm
(c) 0.03 / 300 mm
(d) 0.03 / 400 mm
Which one of the following is used for checking run out of the internal taper of machine spindle ? (a) Dial test indicator (b) Test mandrel and dial test indicator (c) Precision height gauge (d) Test mandrel and precision height gauge The sensitivity of precision spirit level is (a) 0.02 to 0.05/100 mm
(b) 0.02 to 0.05 / 200 mm
(c) 0.02 to 0.05 / 500 mm
(d) 0.02 to 0.05 /1000 mm
Which among the following is NOT the purpose of a grease? (a) Carry away heat produced in bearing. (b) Prevent metal-to-metal contact and reduce friction. (c) Prevent entry of foreign material i.e. dust, dirt etc. in the bearing.
(d) Provide a cushion to a load and shocks. Which one of the following is NOT the property of a good lubricant ? (a) No change in viscosity due to variation in temperature. (b) Reduces friction between machine parts. (c) Takes up the surface pressure between sliding parts. (d) Becomes thicker after prolonged use. A concrete mixture ratio is given as 1 : 2 : 4. Which one of the following indicates these numbers ? (a) One part cement, two parts sand and four parts stone. (b) One part stone, two parts cement and four parts sand. (c) One part sand, two parts stone and four parts cement. (d) One part cement, two parts stone and four parts sand. The most important quality of any lubricant is (a) Viscosity
(b) Specific gravity
(c) Specific heat
(d)Emulsification
Which one of the following is the best way for preparing an emulsion ? (a) Mix soluble oil and water by pouring both simultaneously (b) Add water to the soluble oil (c) Add soluble oil to the water (d) None of the above Which one of the following is common method for applying cutting fluid on the tool point ? (a) With high pressure jet
(b) With a brush
(c) With an oil can
(d) Either 'b' or 'c'.
While machining cast iron, the coolant used should be (a) Dry air
(b) Kerosene
(c) Machine oil
(d) Soft water
215 The use of pipe reamer is: (a) to make OD of the pipe smaller (c) to make ID of the pipe bigger
(b) to remove the burr (d) to make threading
The diameter of the best sized wires, in the three wire measurement of pitch diameter of an external screw thread depends upon (a) major diameter, pitch and helix angle (b) major diameter, pitch and thread angle (c) pitch and helix angle (d) pitch and thread angle Rake angle is not provided on a form tool used to produce taper on a workpiece. The reason for this is (a) to reduce grinding time of the tool (b) to reduce wastage of tool material (c) taper angle is not affected by re-sharpening (d) for the tool to have large wedge angle A simple change gear train is used to cut a certain pitch thread. Due to the non-availability of the required gear from the set, down gear with 3 teeth more than that of the calculated value is mounted.The thread that is cut will have a pitch (a) more than that required for the full threaded length (b) less than that required for the full threaded length (c) equal to that required for the full threaded length (d) more for certain length and then less for the remaining thread length A rough turning tool is ground by hand on a pedestal grinder. After grinding it is observed that the ground faces of the tool are concaved. Which one of the following statements is the cause for this defect? Tool rest not set to the required angle
Tool held in one position only against the wheel Surface speed of the grinding wheel is not as specified The grinding is carried out on a peripheral grinding wheel Which one of the following standard tapers is self-holding type ? (a) Morse taper
(c) Jarno taper
(b) Brown and Sharpetaper (d) Metric taper
The amount of offset of tailstock for taper turning is done by the o ffset screws provided. The procedure to be followed is Loosen both screws and push the body to the amount of offset Loosen both the screws and push the base to the amount of offset Loosen the screw opposite to the direction of movement and tighten the other screw Loosen the screw in the direction of movement and tighten the other screw Single point metric 'V threading tools are checked for its flank angle accuracy by using a (a) thread plug gauge
(b) centre gauge
(c) screw pitch gauge
(d) tool angle gauge
You have to cut threads on aluminium. Which one of the following coolants will you use? (a) Lard oil (c) Soluble oil
(b) Kerosene
(d) Vegetable oil
Different threads have got different depths. Which one of the following has got the highest depth ? (a) Square
(b) Acme
(c) Worm
(d) Buttress
The standard taper of taper pin is (a) 1 : 20 (c) 1 : 40
(b) 1 : 30 (d) 1 : 50
Which taper is used on spindle nose of the lathe headstock? (a) Jarno taper
(b) Brown and Sharpe taper
(c) Pin taper
(d) Morse taper
The most favourable metal for chemical plants and food processing equipment is stainless steel because it has high corrosion resistance at (a) atmospheric temperature only
(b) high humidity
(c) high electrical current
(d) elevated temperatures
Which jig is used for drilling on thin sheet? (a) Solid jig
(b) Sandwich jig
(c) Post jig
(d) Table jig
Carbide tipped tool used for turning hard material is provided .... (a) Side rake angle
(b) Zero rake angle
(c) Positive rake angle
(d) Negative rake angle
The plastics which formed to shape by the application of heat and pressure without any chemical change are known as .... (a) Thermosetting plastics
(b) Thermoplastics
(c) Elastomers
(d) Aminos
The value of one thimble scale division in a metric micrometer is .. (a) 1 mm (c) 0.02 mm
(b) 0.5 mm
(d) 0.01 mm
The main purpose of screw pitch gauge is... To check the minor diameter of screw thread To check the limits of screw thread To check the distance between adjacent crests of screw threads
To check the major diameter of screw thread
The soft material particles get clogged in the grinding wheel while grinding. This is called... (a) Truing
(b) Loading
(c) Glazing
(d) Dressing
The faces of anvil and spindle of outside micrometer is made of... (a) Cast iron
(b) Steel
(c) Tungsten carbide
(d) Aluminium alloy
Which one of the following formula is applied to find the tail stock offset, when turning tapers by offset method ? (a)
(c)
D
d D
d I
(b)
(d)
X L
2 I
D d 2 I
d D 2 I
What is the most suitable size of rod for M6 threading? (a) 6 mm
(b)
(c) 5.6 mm
(d) 5.2 mm
5.9 mm
Best conductor of heat and electricity is Nickel (c) Chromium
(b) Copper
(d) Aluminium
Which machine reamer has guides on front and rear sides? (a) Jig reamer
(b) Rose reamer
(c) Shell reamer
(d) Chucking reamer
In a vernier micrometer, vernier scale is graduated on... (a) thimble (c) barrel
(b) spindle (d) frame
Calculate the tap drill size in mm to tap M12 X 1 thread...
(a) 9.6 mm
(6)10.8 mm
(c) 11.38 mm
(d) 11.62 mm
Which range of cutting speed is suitable for turning mild steel using H.S.S. tool? (a) 30 m/min
(b) 42 m/min
(c) 60 m/min
(d) 70 m/min
a) 15-20m/min (The diameter of the best sized wires, in the three wire measurement of pitch diameter of an external screw screw thread depends upon (a) major diameter, pitch and helix angle (b) major diameter, pitch and thread angle (c) pitch and helix angle (d)pitchandthreadangle
Rake angle is not provided on a form tool used to produce taper on a workpiece. The reason for this is (a) to reduce grinding time of the tool (b) to reduce wastage of tool material (c) taper angle is not affected by re-sharpening (d) for the tool to have large wedge angle A simple change gear train is used to cut a certain pitch thread. Due to the non-availability of the required gear from the set, down gear with 3 teeth more than that of the calculated value is mounted.The thread that is cut will have a pitch (a) more than that required for the full threaded length (b) less than that required for the full threaded length (c) equal to that required for the full threaded length (d) more for certain length and then less for the remaining thread length A rough turning tool is ground by hand on a pedestal grinder. After grinding it is observed that the ground faces of the tool are concaved. Which one of the following statements is the cause for this defect? Tool rest not set to the required angle Tool held in one position only against the wheel Surface speed of the grinding wheel is not as specified The grinding is carried out on a peripheral grinding wheel Which one of the following standard tapers is self-holding type ? (a) Morse taper
(c) Jarno taper
(b) Brown and Sharpetaper (d) Metric taper
The amount of offset of tailstock for taper turning is done by the offset screws provided. The procedure to be followed is Loosen both screws and push the body to the amount of offset
Loosen both the screws and push the base to the amount of offset Loosen the screw opposite to the direction of movement and tighten the other screw Loosen the screw in the direction of movement and tighten the other screw Single point metric 'V threading tools are checked for its flank angle accuracy by using a (a) thread plug gauge
(b) centre gauge
(c) screw pitch gauge
(d) tool angle gauge
You have to cut threads on aluminium. Which one of the following coolants will you use? (a) Lard oil (c) Soluble oil
(b) Kerosene
(d) Vegetable oil
Different threads have got different depths. Which one of the following has got the highest depth ? (a) Square
(b) Acme
(c) Worm
(d) Buttress
The standard taper of taper pin is (a) 1 : 20
(b) 1 : 30
(c) 1 : 40
(d) 1 : 50
Which taper is used on spindle nose of the lathe headstock? (a) Jarno taper
(b) Brown and Sharpe taper
(c) Pin taper
(d) Morse taper
The most favourable metal for chemical plants and food processing equipment is stainless steel because it has high corrosion resistance at (a) atmospheric temperature only
(b) high humidity
(c) high electrical current
(d) elevated temperatures
Which jig is used for drilling on thin sheet? (a) Solid jig
(b) Sandwich jig
(c) Post jig
(d) Table jig
Carbide tipped tool used for turning hard material is provided .... (a) Side rake angle
(b) Zero rake angle
(c) Positive rake angle
(d) Negative rake angle
The plastics which formed to shape by the application of heat and pressure without any chemical change are known as .... (a) Thermosetting plastics
(b) Thermoplastics
(c) Elastomers
(d) Aminos
The value of one thimble scale division in a metric micrometer is .. (a) 1 mm (c) 0.02 mm
(b) 0.5 mm
(d) 0.01 mm
The main purpose of screw pitch gauge is... To check the minor diameter of screw thread To check the limits of screw thread To check the distance between adjacent crests of screw threads
To check the major diameter of screw thread The soft material particles get clogged in the grinding wheel while grinding. This is called... (a) Truing
(b) Loading
(c) Glazing
(d) Dressing
The faces of anvil and spindle of outside micrometer is made of... (a) Cast iron
(b) Steel
(c) Tungsten carbide
(d) Aluminium alloy
Which one of the following formula is applied to find the tail stock offset, when turning tapers by offset method ?
(a)
(c)
D
d D
d I
(b)
(d)
X L
2 I
D d 2 I
d D 2 I
What is the most suitable size of rod for M6 threading? (a) 6 mm
(b)
(c) 5.6 mm
(d) 5.2 mm
5.9 mm
Best conductor of heat and electricity is Nickel
(b) Copper
(c) Chromium
(d) Aluminium
Which machine reamer has guides on front and rear sides? (a) Jig reamer
(b) Rose reamer
(c) Shell reamer
(d) Chucking reamer
In a vernier micrometer, vernier scale is graduated on... (a) thimble (c) barrel
(b) spindle (d) frame
Calculate the tap drill size in mm to tap M12 X 1 thread... (a) 9.6 mm
(6)10.8 mm
(c) 11.38 mm
(d) 11.62 mm
Which range of cutting speed is suitable for turning mild steel using H.S.S. tool? (a) 15-20m/min
(b) 35 - 50 m/min
267.while setting a parting tool ,it must be set such that the a. cutting point is slightly above the center b. cutting point is slightly below the center c. cutting point is exact to the center
d. cutting point is slightly Inclined to the work axis 268. The parting off operation must be carried out at a. a high spindle speed b. automatic feed c. a reduced spindle speed d. a vari able spindle speed 269. Chucks and face plates are mounted on the spindle by the means of a.interchangeable spindle noses b.any of the several types of spindle noses
c. a circle of socket heat cap screw d. a permament assembly 270. Catch plates usually have A. T-slots b. t-slots and straight slots c. one single slots
d. one or several slots 271. If you have to turn the face of any irregulary shaped work piece ,you should mount the piece a. on a face plates
b. in a mandrel and hold in between centres c. between centres d. in a three-jaw chucks 271. Driving plates are used for a. mounting fixtures and work pieces b. driving shafts between centres with a lathe dog
c. facing operation only d. internal operations only 272. A Tumbler gear unit has a. a single gear b. two gear c. three gear
d. four gear 273. A trumbler gear is provided a. to change the direction of feed
b. to transmit the motion from the leadscrew to the carriage c. to change the direction of the chucks d. to change the spindle speed 274. The least count of vernier caliper is a. 0.01mm b. 0.02mm
c.0.001mm d.0.1mm 275. The least count of a vernier caliper in which 19(19mm) main scale divisions are divided into 20 equal divisions in the vernier scale will be a. 0. 01mm b . 0.02mm c . 0.03mm d . 0.05mm
276. The center drill size is suitable for center drilling 40 mm diameter of work which is to be turned is
a. 1Ẍ1.5 b. 2Ẍ5 c. 3Ẍ8
d. 5Ẍ12 277. The center drill size is selected on the basis of the a. length of the job b. material of the job c. diameter of the job
d. type of operation 278. Center drilling is done at a a. high spindle speed with a high feed b. low spindle speed with a high feed c. high spindle speed with a low feed
d. low spindle speed with a low feed 279. A work piece is centre drilled in the lathe for the purpose of a. turning in between centers only b. spotting a hole for drilling or turning between centers
c. placing it on a mandrel and turning between centers d. facing to center of the work pieces 280. The center drill breaks as a results of a. too heavy feed and too low speed
b. too light feed and too high feed c. dropping it on the floor d. allowing chips to form a tangle around them
281. Which one of the following is not the appropriate purpose of groo ving a. to provide clearance for the tool b. to provide a reference plane for measuring c. to permit full travel of the nut up to the shoulder d. to ensure a proper fit for mating components 282. Knurling operation is done at the a. turning the spindle speed b. high spindle speed c. 1/3 of the turning speed d. 1/2 of the turning speed 283. the lenghth of job upon which taper turning can be done by offsetting the tail stock is a.longer then the bed b.the maximum length held between centres
c.very short length d.of any length 284.taper turning by offsetting the tailstock method can produce a.an internal taper b.an internal taper thread c.an external taper d.both external and intarnal tapers 285.when the tailstock is offset for taper turning,the angle produced on different lengths of the Workpiece for the same offset a.will be the same b.will not the same
c.will increase in degrees equal to the increasein lentgh d.will decrease in degrees equal to the increase in length 286.long and narrow external taper threads may be cut by a.swivelling the compound si\lide method b.offsetting the tailstock method c.using the taps d.using the split dies 287.the purpose of using a mandrel is a.to hold the workpiece securely b.to give a high degree of concentricity of external diameter with a previously bored and finished hole c.to give a high degree of correctivity with a previ ously turned step d.to enable to turn at high speeds 288.the mandrel shown here is a.an expanding type
b.a solid type for turning in between centre c.a solid type for turning in a chuck d.a taper mandrel 289.mandrels are generly used when machinig with a.heavy cuts b.short facing cut
c.light cuts d.boring tools 290.A mandrel is used a.in a chuck for moving the jaws
b.for taper turning only c.for holding the dead centre d.for turning a bored workpiece over the whole length
291.the thrread M10x1.25 is a fine thread.this type of thread is used a.when the normal thread profile would be a hindrance b.when great forces have to be transmitted c.when a thread with a course pitch is required d.when easy unscrewing has to be prevented 292.A thread M30x2 mm is to be cut on mild steel work internally.select the most suitable hole size to be bored before cutting the intarnal thread a.28 mm b.30 mm c.27.6 mm d.27 mm 293.multi-start threads are used a.when alternating loads have to be transmitted b.to achieve a small amount of friction at the flanks of the thread c.to achive a great axial movement withj a small rotary motion d.to achieve a small axial movement with a great rotary motion 294.what does the expression M22x2 mean a.metric thread 22mm out side diametre,grade2
b.metric threaed Ө22 and two starts c.metric thread 22mm outside dia,2mm depth of thread d.metric thread 22mm outside dia,pitch 2mm
295.the depth of B.I.S metric thread is
a.0.6403xp b.0.6xp c.0.6134xp
d.0.5xp 296.threads are cut on a lathe with a single point tool a.by making a series of cuts in the same groove
b.in one cut for the depth of thread c.by moving the carrige by means of the rake that is located under the front way d.by setting the correct feeds on the quick change gear box 297.measuring erros which are due the measuring instrument are know as a.random erros b.sysmatic erros
c.observation errors d.contact errors 298.when the theoretical form indicated on the drawing does not correspond with the workpiece measured,the error is known as a.micro-geometrical error b.macro-geomatrical error
c.cosine error d.random error 299.surface roughness result in a.micro-geomatrical error
b.systematic error c.temperature error d.random error
300.observation error is also known as a.cosine error b.parallex error
c.tempreatur error d.random error 301.the reference tempreatuer for measurent is a.15°c b.25°c c.20°c
d.10°c 302.thread chaser are used for a.quick production of threads b.maintaining an exat form of thread
c.cutting threads on hard materials d.cutting thread on soft materials 303.thread chaser are made out of a.carbon steel b.high speed steel c.tool steel
d.stainless steel 304.chasers are used to cut a.ʿvʾ form threads only b.sqare threads only c.acme threads only
d.any form of threads 305.the cutting teeth forms on chasers are produced a.on a lathe b.on a tool and cutter grinder c.by a suitably shaped grinding wheel d.on a millung machine 306.hand chasers are mostly used for cutting small thread on a.carbon steel b.high speed steel c.mild steel d.brass and other soft materials
307.tangential chasers or dove-tail chasers are clamped in a a.tool-bit hoder b.special tool holder c.lathe tool post d.tool holder meant for holding circular form tool 308.a chares not set to the corret centre height of job will cut a.rough thread b.corret profile threads c.oblique threads
d.wrong pitch threads. 309.to cut M24x3mm pitch internal threads,the core diametre of the job is a.27.00mm b.24.50mm
c.21.00mm
d.24.00mm 310.the depth of cut forM24x3mm internal threads is a.0.5412x3
b.0.6134x3 c.0.5x3 d.0.7x3 311.to cut 24x3mm internal acme threads,the core diametre of the job is a.20.00mm b.21.60mm c.21.00mm d.20.60mm
312.the width of the acme tool at the cutting edge should be a.0.3707xP
b.0.5xP c.0.6xP d.0.4xP 313.the depth of cut for metric square threads is a.0.6xP b.0.5xP
c.0.5412xP d.0.6412xP 314.to cut M30x3.5mm internal square threads,the core diameter is a.27.5 mm
b.26.5 mm
c.29.8 mm d.26.0mm 315.to cut butters threads,the depth of cut is a.0.5412xP b.0.6xP c.0.7xP d.0.75xP
316.the width of the tool at the cutting edge for cutting square threads is equal to a.0.5xP
b.0.6xP c.1xP d.0.3707xP. 317. to enable a nut to fit properly on a bolt with square threads. The width of the internal square thread the wedth of the internaql square thread will be a. equal to half the pitch b. less then half pitch c, slightly more then half pitch
d. double the pitch 318. for the cutting the acme threads ,the tool is ground to an included angle of a. 600 b.290
c.47.50 d.300
319. to cut m20 ×2.5mm internal ‘v’ thread on a lathe the most useful tool is
a.HSS solid tool 16mm×120mm b.HSS tool bit 6mm square section of suitable length c.tipped tool d. inserted tool bit in a tool holders 320. the cutting edge of a solid tool is made of a.carbon steel b.mild steel c. super high speed steel
d.stellite
321. The dial test indicator shows the measurement as a. the actual size of the component b. the difference between the two steps of 5 mm c. the magnified small variations in sizes through a pointer
d. the direct reading of the dimension 322.The principle of working of the dial test indicator is a. the linear motion is converted into reciprocating motion using slotted link b. the linear motion is converted into rotary motion using rack and pinion c. magnifications of small variation using lenses d. magnifications by electronic means. 323. The part of the vernier bevel protractor which is normally used as a reference base for measuring the angle is a. blade
b. stock
c. disc
d. main scale
324. The part of the vernier bevel protractor on which main scale divisions are marked is a. stock
b. dial
d. adjustable blade
c. disc
325. The part of the bevel protractor which comes in contact with the inclined surface while measuring is b. stock
a. blade
c. disc
d. dial
326. The value of each division of the main scale of a vernier bevel protractor is a. 10
b. 100
c. 50
d. 5 min
327. The value of each division of the vernier scale of a vernier bevel protractor is a. 10
b. 10 5min
c. 10 55min
d. 5min
328.The following precision instrument is used for aligning the lathe centres a. vernier caliper
b. micrometer
d. slip gauges. c. dial test indicator 329. For checking parallelism one of the following devices is used a. chuck
b. face plate
c. test bar
d. revolving centre.
330.Centre alignment will help to get a. taper on job
b. thread formation on job
c. radius formation on job
d. parallelism on job
331. Inside tapers are checked with a. a taper ring gauge c. an inside caliper
b. a screw plug gauge d . a taper plug gauge.
332. Turning taper by the compound rest method involves working solely with a. decimal measurements b. fractional measurements c. metric measurements
d. angular measurements. 333. Long tapers are produced a. with the taper turning attachment b. with the compound slide c. by setting over the tail stock d. by adjusting the cross slide. 334. The length of turned tapers are checked with a. vernier caliper
c. inside caliper
b. micrometer d. by adjusting the cross slide.
335. The disadvantages of taper turning using the compound slide are a. only long tapers can be turned b. only very large tapers can be turned c. only manual infeed is possible d. only short tapers can be turned due to the restrictions of the compound slide. 336. External tapers are checked with a. limit plug gauge b. taper ring gauge
c. taper plug gauge d. thread plug gauge. 337. Other name for ball turning is a. form turning c. spherical turning
b. convex turning d. profile turning
338. While turning a ball form right to left the movement of a. carriage and compound slides are used
b. cross feed and compound slide are used
c. carriage and cross feed are used d. any of the above can be used. 339. A jig is a special device a. which holds the job b.which locates the cutting tool c. which guides the tool d. which holds, supports, locates and also guides the cutting tool. 340. Drilling jigs are used for a. drilling operation only
b. holding the jobs while drilling c. drilling, reaming, tapping and other allied operations d. none of the above. 341. A fixture is a production tool thata. locates the piece part b. holds the piece part
c. controls the cutting tool d. locates and holds the piece part but does not c ontrol the cutting tool. 342. Selection of a particular type of jig will be based on a. the shape of the piece part b. the place where drilling or its allied operation has to be performed c. the shape of the piece part and place where the drilling and its allied operation has to be performed
d. none of the above. 343. Which type of jig is used for location from a bore
a. solid jig
b. drill jig
c. box jig
d. post jig.
344. The type of jig in which base plate is not available is a. plate jig
b. box jig
c. post jig
d. latch jig.
345. What are the tapers you can measure with taper plug and ring gauges? a. non standard tapers b. standard tapers
c. all types of taper. 346. Taper ring gauge is used to measure a. external taper
b. internal taper c. external and internal taper. 347. Taper plug gauge is used to measure a. external and internal taper b. internal taper
c. external taper 348. Your job taper is correct if it is measured a. above the higher limit b. in between higher and lower limit
c. below the lower limit. 349. Speed used for knurling should be a. very high
b. high
c. low
350. while knurling, the tool should be suppled with.
a. copious coolant
b. little coolant
c. no coolant 351. What happens if both the rollers of the knurling tool do not fully bear on the work ? a. tool may break b. it may cause accident c. full pattern of the knurl is not formed 352. Sine bar is made of – a. high carbon steel b. high speed steel c. nickel steel d. stabilized chromium steel. 353. Sine bar is used for a. leveling the job for drilling b. Finding the angle of taper job c. measuring diameter of holes d. checking profile of thread. 354. Length of sine bar is the distance between a. one end to another end of sine bar b. diagonal cross length of the sine bar c. centre to centre between rollers.
d. outside to outside between rollers.
355. The size of sine bar is specified by it’s a. weight
b. measurement of width
c. length
d. maximum angle of setting.
356. The purpose of providing a stcpper at one end of the sine bar is for a. easy handling b. preventing the job from slipping
c. supporting the slip gauge d. using as a reference while setting. 357. The purpose of the holes provided on the slides of the sine bar is to – a. prevent distortion b. to reduce the weight as well as to clamp the workpiece
c. handle easily d. minimize surface contact. 358. To improve the surface finish of the bored hole, it should b e smoothened out a. by your fingers b. by your hand c. by the use of emery paper with stick. 359. Remer is a tool used for a. finishing a bored hole with rough surface b. enlarging a bored hole c. knurling the bored hole .d. finishing a bored hole to the given size with smooth surface. 360.While boring, the cutting speed used is a. more than external turning b. the same for external turning c. half of the external turning. 361. The boring tool is selected
a. based on length and diameter of the bore b. based on length of the bore c. based on surface finish of the bore 362. Boring is a operation which a. enlarges the hole already drilled b. reduced the dia. Of the hole c. grinds the surface of the hole. 363.When checking bored holes with a plug gauge a. The tool is removed from the hole b. the tool is covered c. The workpiece is removed d. the tool is removed from the tool post. 364.the internal radius turned A .for tight fit b. for oil circulation c. for ball bearing seating d.for machining convenience 365.how will you ensur the correctness of internal radius a. by radius gauge b. by seating a round ball bearing c. by grinding an internal radius tool equal to the radius of job to do the operation d. by template 366.what speed will you use for internal radius forming A .slow speed
b.medium speed c. high speed d.fast speed 367. to check the correct ness of the radius ground on boring tool ,you will use a. a straight gauge b.fillet radius gauge
c. a convex radius gauge d. all of the above 368.treapining tool is used for a. small boring b.step boring c. bigger sizes hole
d. blind holes 369.while boring the trepanning tool are used A .for saving materials b. for surface finish c. for saving time d. all of the above 370 what is the princepal of micromiter. a.bolt & screw mechanism
c. rack and pinion
b.sliding mechanisam d.none of these
371.The half included angle of the morse taper Is
a.1degree 29 minutes
b.3degree 29 minutes
c.2degree 58minutes d.3degree 15 minute
372. The taper ratio of the morse taper i s a.1 in 10
c.1in20
b.1in 15
d.1in 25
373. The morse standard taper is available in a.16numbers
c.10numbers
b.12numbers
d.8numbers
374. If the compound slide swivels base is set at a 60 0 to the lathe centreline,the degrees of the reading at the cross slide Index will be a.450
c.1500
b.300
d.90 degree
375.The form tool method of turning taper is suitable for lengthy jobs with slow tapers a. Any length of work b.Very .b b. b.Short and slow angle c. right at any angle 376. A taper workpiece has an angle of 70 0.if the taper is made with a compound rest ,how many degrees should the setting be on the swivel base. a.700
c.200
b.1400
d.350
377.Tapers may be measured when the work is in the lathe by using a. A taper plug and a ring gauge b. steel rule and a micrometer
c.. Universal bevel protractor d. Sine bar and slip gauges
378.The tailstock offset amount may be measured By using a steel rule to measure the distance between the dead center and ways
b.With a dial indicator ,a rule,a tool holder,and a micrometer dial
With a micrometer,caliper or an offset gauge
With a height gauge
379.the least count of universal vernier bevel protractor is a. 6 min
c..0.5min
b.1/120 380.______standard taper is named as a self locking type a.Jarno taper
b.Morse taper
c.Pin taper
d.None
381.the ratio between the difference in the diameter of the taper and its length is known as A .Concencity
c. both a&b
b. Conicity
d .None
382.Long and steep tapers and turned by offsetting the ________ centre a.Headstock
c.Spindle
b.Tailstock
d.Chuck
383._______is used to measure the taper angle upto an accuracy of 5 min. a.Bevel protractor
b.Protractor
c.Vernier bevel protractor
d.None
384._______taper is employed in the lathe headstock spindle bore a. Brown and sharp b. Morse c. Jarno
d.Metri
385.____ gauge is used for21.The half included angle of the morse taper Is a.1degree 29 minutes b.3degree 29 minutes d.3degree 15 minutes
c.2degree 58minutes
386.The taper ratio of the morse taper is a.1 in 10
b.1in20
c.1in 15
d.1in 25
387. The morse standard taper is available in a.16numbers
b.10numbers
c.12numbers
d.8numbers
388. If the compound slide swivels base is set at a 60 0 to the lathe centreline,the degrees of the reading at the cross slide Index will be a.450
b.1500
c.300
d.900
389.The form tool method of turning taper is suitable for Lengthy jobs with slow tapers
Very short at any angle
Any length of work
Short and slow angle
390. A taper workpiece has an angle of 70 0.if the taper is made with a compound rest ,how many degrees should the setting be on the swivel base. 700
200
1400
350
391.Tapers may be measured when the work is in the lathe by using A taper plug and a ring gauge
Universal bevel protractor
A steel rule and a micrometer
Sine bar and slip gauges
392.The tailstock offset amount may be measured
By using a steel rule to measure the distance between the dead center and ways
With a dial indicator ,a rule,a tool holder,and a micrometer dial
With a micrometer,caliper or an offset gauge
With a height gauge
393.the least count of universal vernier bevel protractor is 6 min
1/120
50
0.5min
394.______standard taper is named as a self locking type Jarno taper
Morse taper
Pin taper
None
395.the ratio between the difference in the diameter of the taper and its length is known as Concencity
both a&b
Conicity
None
396.Long and steep tapers and turned by offsetting the ________centre Headstock
Spindle
Tailstock
Chuck
397._______is used to measure the taper angle upto an accuracy of 5 min. Bevel protractor
Protractor
Vernier bevel protractor
None
398._______taper is employed in the lathe headstock spindle bore a. Brown and sharp b.Morse c.Jarno d.none 399.what is the leap clearance angle of drill. a.12-15 b.8-12 c.17-25 d. 30-35 400. Lubricant is necessary to (a) Run the machine smoothly taking least load, (b) Run the machine quickly, (c) Stop the machine immediately, (d) Producer work piece of greater accuracy 401. The general ratio of soluble oil and water used as coolant is (a) 10:1 (b) 1:10 ( c) 1:20 (d) 20:1 402. The best example for Semi- liquid lubricant is (a) Grease (b) Graphite (c) Castrol oil (d) Lard oil 403. Best example for gravity feed lubricator is (a) Grease gun (b) Ring lubricator (c) Tell-tale lubricator (d) wick feed lubricator 404. Most common type of cutting fluid used in almost all the machining operations is (a) Water (b) Lard Oil (c ) Soluble oil (d) Compressed air 405. Fire point is (a) The temperature at which oil gives of sufficient vapour to burn at continuously when ignited (b) The temperature at which oil will case to flow cooled (c) The lowest temperature at which oil gives off sufficient vapour to support a momentary flash with out actually setting fire. (d) The temperature at which fire is produced 406. Graphite is a
(a) Liquid lubricant (b) Semi-liquid lubricant (c ) Solid lubricant (d) None of the above 407. The best example for splash lubricator is (a) Ring lubricator (b) Wick feed lubricator (c) Grease gun (d) Pump lubricator 408. Slide ways of a machine are frequently lubricated by (a) Oilcan (b) Grease gun (c) Ring lubricator (d) Wick feed lubricator
409. Which one of the following is the reason that tap water is not preferred as coolant on machine tools? (a) it decreases cutting action of the tool (b ) danger of corrosion (c) it has insufficient cooling affect (d) Due to high cooling affect the cutting edges of tool break off 410. Which one of the following frictions occurs in an un-lubricated journal bearing? (a) Sliding friction (b) Rolling friction (c) Fluid friction (d ) Dry friction 411. In which one of the following materials no cutting oil is used when drilling? (a) Tool steel (b ) Grey cast iron (c) Copper (d) Aluminum 412. For affective cutting of steel with hand hacksaw, which one of the following coolant is suitable? (a) Cutting oil (b) Grease (c) Lard Oil (d) Kerosene oil 413. Which among the following is NOT the purpose of grease? (a) Carry away heat produced in bearing (b) Prevent metal-to-metal contact and reduce friction (c) Prevent entry of foreign material i.e. dust, dirt etc. in the bearing (d) Provide a cushion to a lo0ad and shocks 414. Which one of the following is NOT the property of a good lubricant? (a) No change in viscosity due to variation in temperature (b) Reduces friction between machine parts (c) Takes up the surface pressure between sliding parts (d) Becomes thicker after prolonged use 415. the most important quality of any lubricant is
(a) Viscosity (b)Specific heat (c) Specific gravity (d) Emulsification 416. Which one of the following is the best way for preparing an e mulsion? (a) Mix soluble oil and water by pouring both simultaneously (b) Add-water to the soluble oil (c) Add soluble oil to the water (d) None of these
417. Which one of the following is common method for applying cutting fluid on the to ol point? (a) With high pressure jet (b) With a brush (c) With an oil can
(d) Either ‘b’ or ‘c’ 418. While machining cast iron, the coolant used should be (a) Dry air (b) Kerosene (c) Machine oil (d) Soft water 419. When tolerance is given on one side of the basic dimension, it is called (a) Tolerance system (b) Allowance system (c) Unilateral tolerance (d) Bilateral tolerance 420. The maximum clearance between whole 30 +0.021+0.000 and shaft 30-0.110-0.143 is
(a) 0.164 mm (b) 0.143mm (c) 0.131 mm (d) 0.110 mm 421. Limits of 50mm hole is ES=+0.025 and minimum hole size will be : (a) Max. 50.02mm; Min. 49.998mm (b)Max. 50.025mm; Min.50.002mm (c)Max. 49.998mm; Min.50.002mm (d)Max. 49.990mm; Min.49.975mm 422. British standard limit system consist of (a) 21 Classes of fits and 16 grades of tolerances (b) 12 classes of fits and 61 grades of tolerances (c) 16 classes of fits and 21 grades of tolerances (d) 61 classes of fits and 12 grades of tolerances 423. A dimension is stated as ø 25 H 7 in a drawing. The lower limit is (a) 24.75mm (b) 24.85mm (c) 25.00mm (d) 25.021mm 424. A dimension is stated as 25 +-0.02mm in a drawing. What is the tolerance? (a) 25.00mm (b) +0.02mm (c) -0.02mm ( d) 0.04mm 425. The difference between the maximum and minimum sizes allowed in manufactured components is called: (a) Clearance (b) Allowance (c ) Tolerance (d) Limit 426. The measured size of the dimension of a component is called (a) Basic size (b) Nominal size (c) Allowed size
(d) Actual size 427. A pin fitted in a hole. The tolerance zone of the pin is entirely above that of hole. The fit obtained will be (a) Clearance fit (b) Interference fit (c) Transition fit (d) None of the above 428. In the drawing the dimension of a shaft is shown 40 +0.068-0.042mm. Which size of shaft is not within the tolerance? (a) 40.068mm (b) 40.096mm (c) 40.000mm (d) 39.998mm 429. Interchangeability is normally applied for (a) Repairing of parts (b) Mass Production (c) Single piece production (d) All the above 430. Bilateral tolerance is fixed (a) On upper side of the basic size (b) On lower side of the basic size (c) On any one side of the basic size (d) On both sides (upper & lower) of the basic size 431. Best example for driving fit is (a) Ball bearing on the shaft
(b) Tyre on the rail wheel (c) Pulley with key on the shaft (d) Cart rim on the wooden wheel 432. In hole basis system (a) The size of the shaft is made constant (b) The size of the hole is made constant (c) The permissible tolerances are given on the hole and the shaft (d)Allowance is given only on the hole 433. Tolerance is given to the part size to (a) Increase the production (b) Decrease the production (c) Finish the components approximately (d) P roduce the parts within the required permissible size error 434. As per BIS system of limits and fits, there are 18 grades of tolerances represented by number symbols from
(a) ITO1, IT1…. To IT16 (b) IT1… to IT18 (c) IT0… to IT17 (d)IT01, IT0,IT1 to 16
435. Which of the following is not the correct method of expressing a fit under BIS system of limits and fits? (a) 45 H8 / g7 (b) 45 H8 – g7 (c) 45 H8-g7 (d) 45H8/g7
436. The size of a component is given as 24-0.1. What does -0.1 indicate? (a) Upper deviation is+0.1mm (b) Lower deviation is0.0mm (c) Fundamental deviation is 0.0mm (d) Lower deviation is-0.1mm 437. Which one of the following is the clearance fit under the hole basis system? (a) 20 H7/P6 (b) 20 H7/Z11 (c) 20 E8/g11 (d) 20H7/g11 438. Which one of the following measured dimensions is with the tolerance as per drawing given in fig? (a) 44.92 mm (b) 44.88 mm (c) 45.08 mm (d) 45.04 mm 439. in the assemblies obtained by using the system of limits and fits, the damaged parts (a) Cannot be replaced (b) Are required to be scrapped (c) May be easily replaced without rejecting the assembly (d) Have to be made with new tolerance 440. In the BIS system of limits and fits the standard range of sizes covered are (a) 0 to 500 mm (b) 25 to 400 mm (c) 0 to 100 mm (d) 0 to 10 mm 441. The tolerance of a hole is the difference between the (a) Maximum hole size and maximum shafts size
(b) Maximum hole size and minimum hole size (c) Minimum hole size and maximum shaft size (d) Maximum hole size and minimum shaft size 442. The three classes of fits as per BIS system are (a)clearance fit ,transition fit and interference fit (b)medium fit , push fit and tight fit (c)flat fit , round fit and square fit (d) sliding fit , loose fit and shrinkage fit 443. In the BIS system of limits and fits, 25 hole deviations are specified by using a. small letter
b . capital letters
c. small letters with tolerance
d. small letters with numbers
444. Which one of the following statements is correct a. interchangeability of parts may be obtained by adopting the system of limits and fits
b. the BIS system of limits and fits dose not give the desired fit c. interference fit is always designed with a positive clearance `
d. transition fit is always specified with negative clearance
445. The first step of quality control is the product specification. On who´s opinion is the product specification based a. marketing department
b. consumer/user
c. sales department
d. servicing department
446. Mass-produced component should be interchangeable . One of the following is the most important factor required to achieve the interchangebillity in mass production a. dimensional accuracy
b. standardization
c. geometrical accuracy
d. surface finish
447. Threaded components both external and internal are manufactured with thread tolerance. One of the reasons for having thread tolerance is to a. ensure enterchangebillity of threaded parts b. identify and group up threaded assemblies by labeling c. determine the percentage of thread of both bolt and nut d. obtain qualitative surface finish 448. In the BIS system of limits and fits, the grades of tolerance are represented by number and there are a. 18 grades of tolerances
b.16 grades of tolerance
C. 14 grades of tolerances
d. 20 grades of tolerance
449. Which among the following is the correct statement a. a clearance fit always provides interference b. an interference fit always provides clearance c. an interference fit may some time provide clearance and some time interference d. a transition fit may some time provide clearance and some time interference
450. a hole whose lower deviation is zero is called basic hole. Which one of the following letters indicates basic hole a. E
b. F
C. G
D. H
451. Under the terminology of the IS system of limits the tern ´tolerance ´ is defined as the difference between the a. maximum limits and the basic size
b. minimum limit and the basic size
c. maximum limits and minimum limit d. actual size and basic size
452. If the dimensions of a component is finished within the limit size , then it will be __________ a. minimum size
b. basic size
c. acceptable size
d. rejected size
453. The distance a drill moves into the work for each revolution of the spindle is called the a. feed of drill
b. speed of drill
c. depth of drill
d. cutting speed of drill
454. The used pipe reamer is a. to make OD of the pipe smaller b. to remove the burr c. to make ID of the pipe bigger
d. to make threading
455. As per indian standard system of limits and fits , there are 18 grades of fundamental tolerance . these are
a. 1T1, 1T2 ,…………1T18
B. 1T0,1T1, 1T2,…… 1T17
C. 1T01,1T0, 1T1, 1T2,…..1T16
D. 1T00,1T01,1T0,1T2,….1T15
456.General composition of high speed steel cutting tool ( H.S.S) is in ratio of 18: 4:1. In the ratio 18 refers to a. chromium
b. tungsten
c. cobalt
d. vanadium
457. The difference between maximum limit of size to it’s corresponding basic size of component is a. actual deviation
b. upper deviation
c. tolerance
d. lower limit
458. When checking bore with three- point internal micrometer ,the types of error detected is a. micro geometrical error
b. macro geometrical error
c. temperature error
d. observation error
459. For sawing cast iron the coolant used is a. watter
b. dry air
c. kerosene
d. soluble oil
460. The zero checking is done for (0 to 25 mm) depth micrometer on a a. test piece
b setting ring
c. surface plate
d straight edge
461. the diameter of best sized wires, in the three wire measurement of pitch diameter of an external screw thread depends upon a. major diameter, pitch and helix angle
b. major diameter, pitch and thread angle
c. pitch and helix angle
d. pitch and thread angle
462. Which one of the following is used as a coolant while drilling plastics ? a. water
b. compressed air
c. serve cut-5
d. serve synth-2
463. Rack angle is not provided on a from tool used to produce taper on a work piece. The reason for this is a. to reduce grinding time of the tool b. to reduce wastage of the material c. taper angle is not affected by resharpening
d. for the tool to have large wedge angle 464. A simple change gear train is used to cut a certain pitch thread. Due to the non – availability of the required gear form the set , driven gear with 3 teeth more than that of the calculated value is mounted . The thread the is cut will have a pitch a. more than that required for the full threaded length b. less than that required for the full threaded length
c. equal to that required for the full threaded length d. more for certain length and than less for the remaining thread length 465. Which on of the following methods of catching the thread takes the longest time ? a. chasing dial
b. pre – determined travel of the carriage
c. marking on work holding device and lead screw d. reversing the machine
466. A carbide tippet tool with the blue marking is used on a lath e. Which on of the following material can be machined with this tool ? a. brass
b. steel
c. plastic
d. grey cast iron
467. A rough turning tool is ground by hand on a pedestal grinder . A after grinding it is observed that the grounded of the tool are concaved . Which on of the following statements is the cause for this defect ? a. tool rest not set to the required angle b. tool held in one position only against the wheel c. surface speed of the grinding wheel is not as specified d. the grinding is carried out on a peripheral grinding wheel
468. The standard solid plain mandrel is generally made of tool steel , h ardened and ground with a taper of A. 1:20
B.1: 100
C. 1: 200
D. 1 : 2000
469. The tensile stress is tensile load divided by a. length of work piece
b. cross sectional area of the work pieces
c. circumferential area of the work pieces d. volume of the work pieces 470. Metals posses physical and mechanical properties. Which one of the following is a physical property? a. fusibility
b. tenacity
c. ductility
d. mallebilli
471.the process of heating and cooling for changing the structure of steel for obtaining the required properties is called a. hardening b. heat treatment
c. normalising
d. tepering. 472.the process by whice steel is is heated to a suitable temperature depending upon its carbon content and is held at that temperature for sufficient time and then slowly cooled to room temperature is known as a. annealing
b. hardening c. normalising d. tempering 473.the main purpose of annealingis a. to increase the hardness b. to increase the toughness c .to improve machinability
d. to remove distoration. 474.the process which helps in produing a fine grain fro uniformalty of structure and for improved mechanical properties is known as a.tempering b.annealing c.hardening d.normalsing
475.which one of the following is an alloy of carbon and iron, in which carbon is in a combined state a.steel
b.wrought iron c.cast iron d.pig iron 476.carbon dissolied in the to form a solid solusiton is called
a.cementite b.ferrite
c.pearlite d.austentite 477. a chemical compound of carbon with iron is called a.ferrute b,pearlite c. cementite
d. austentite 478. cementite and ferrite will together form a laminated structure in the steel is called a. martensite b . alloy steel c. austentie d. pearlite
479. increase of carbon content in steel results in proportional a. reduction of strength b. increase in hardness
c. increase in strength d. increase in ductility 480.pearlite combines the good properties of both ferrite and cementite and due this.a certain property of steel increases with the carbon conten unitl 08% crabon is reached. Which property is that? a. hardness b. strength
c. ductility
d. malleability 481.what is the angle of pipe thread? a. 600 b. 47 1/20 c.290 d.550
482.what is the use of pipe thread? a. transmission b. maintain pressure c. air tight cnectionon
d. none of the above 483. Before thread cutting the following taper is turned at the end of the pipe a.3034’ 0 0 b. 1047’c.1 45’d. 2
484. Internal threads of the coupling can be formed with a. thread milling cutting b. reamer c. tap
d. dia.
485.what is the depth of the 2’’ pipe thread ? a. 0.5’’ b. 0.640’’ c.0.335’’
d.0.580’’
486. when turning long work pieces, the following is used a. sleeve b. change gear c. steady rest
d. bracket 487. The change gear must be done only when a. the spindle is running b. the carriage is running c. the lead screw is running d. the m/c main is switched off.
488.The external thread is checked with a. thread cutting tool b. thread plug gauge c. thread ring gauge
d. tap. 489. the cutting angle in a tool is equal to a. 900-clearance angle + wedge angel b. 900-weadge angel + face angel c. 900- rake angle + clearance angle
d. none of the above 490.the cutting speed of carbide tipped tool as compared to HSS is a. 7times as great b. 3times as great
c. 10times as great
d. 5times as great
491.The pitch on job is 1/12’’. The lead screw pitch is ¼’’,what will be t he change gears to cut this thread ? a. Dr/Dn=16/48 b. Dr/Dn=20/120 c. DR/DN=40/120
D. none of these 492. the pitch is 3mm,3 start thread on job. What is lead o f the thread ? a. 12mm b. 9mm
c. 15mm d. 6mm 493. the major dia. Is 40mm. pitch of the square thread is 5mm. what is the pitch dia. Of the thread? a. 37.5mm
b. 38mm c. 35mm d.45mm 494. the major dia. Is 40mm.pitch of the square thread is 5mm, what is the minor diameter Of the thread? a. 30mm b. 32mm c. 35mm
d.26mm 495. what is the formula to find out helix angel? a. lead/ pitch dia.
b. pitch/ lead ×pitch dia.
c. lead/π×major dia. d. none of the above 496. what is the width of tool used to cut 5mm pitch square thread? a.5mm b.3.5mm c. 2.5mm
d. 2mm 497. Helix angel is formed on the a. lathe bed b. square threading tool c. square thread job
d. taper attachment 498. leading angle is ground on the a. front of the square threading tool b. advancing side of square threading tool c. top of the square threading tool d. all of the above 499. leading angle is equal a. helix angle -1 030’ b. helix angle ×1030’ c. helix angle% 1 030’ d. helix angle + 1 030’
500. following angle is equal to
a. helix angle- 1030’
b. helix angle × 1030’ c. helix angle % 1 030’ d. helix angle + 1 030’
