Is June 2013

Aviation World (www.dgcaquestionpapers.blogsp (www.dgcaquestionpapers.blogspot.com) ot.com)

Instrument System

IS JUNE 2013

1. MTCS, for instrument element sequence-

A. Detecting / Measuring /Coupling /indicating element B.Measuring/coupling/indicating/detecting element C.Coupling/indicating/measuring/detecting element 2.Sometimes the same instrument serves s erves more than one element than the bourden tube serves as – (OP-08)A. Detecting & Measuring element

B. Detecting & Coupling C. Detecting & Indicating

3.The command bars which directs the aircraft as on FDS forms (OP-363)

A.Normal V B.Inverted V C. Shallow Inverted V D. None of the above 4.For the cabin of the aircraft to be pressurized, the essential items are (FAA-8549)A. Cabin Alt, Diff. pr. Ind., VSI B. Cabin alt, Altimeter, VSI C. Both A & B

5.MTCS- the warning flags that appear in the Mach/ASI in ADC (NP-171) A.Vmo flag- indicates failure of Vmo & Mmo ckts B.M flag- indicates failure of mach ckt C.both A & B 6.The three operating positions of the Oxygen regulator are (15A-595) A. Normal, High, Emergency B. Normal, Low, High C. Emergency, Normal, Low 7.The X-OR gate will provide o/p only when the both inputs are (BLT-2583) A. Different B. Same C. Low D. High

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Aviation World (www.dgcaquestionpapers.blogsp (www.dgcaquestionpapers.blogspot.com) ot.com) 8.The standard atmospheric condition is (OP-65) A. Pressure at sea level is 1013.25 mb & temp is 15 degree C B.As in A, for every 1000 ft increase in altitude temp decreases by 1.98 degree C C.Beyond 36089ft the temp remains constant. D. Both B & C are correct 9.The dispatch readiness of a/c is shown in ____ mode of EFIS(NP-380) A. Status B. Maintenance C. Operation

10.The position of primary flt control surfaces of a/c is shown in ____ mode of EFIS (NP-380)A. Status B. Maintenance C. Operation

11.If the pentavalent impurity is added to an intrinsic semiconductor (BLT-2041) A. N-type semiconductor is formed B. as in A conduction band is almost empty C. only A is correct 12.How can the slip of indicator glass has been occurred determined – determined –(15A-470)A. (15A-470)A. white index mark B. red index mark C. blue index mark

13.Some of the instruments has all 4 units in the combined units & are cantained within the case of the instruments ,these are (OP-06) A. direct reading instrumentsB. self cantained instruments C. remote reading instruments 14.In a/c instrument i nstrument system we use-(OP-07) A.Rod & lever is used as coupling element B.application of lever confined to the direct reading pressure gauge C.application of rod is confined to the a/c pitot – pitot –static static system instruments D.all of the above & instruments using multiple pointer we use gear mech. 15. In a/c instrument & control system-(OP-12/13) A.a problem to be faced is that a gear can always turn small amount before it will drive the one in which it is meshed with B.this loss of motion is called backlash C.as in B & it can be avoided by using coiled hairspring D. all of the above & backlash can be elminatedv by antibacklash gear


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Aviation World (www.dgcaquestionpapers.blogsp (www.dgcaquestionpapers.blogspot.com) ot.com) 16. The temp compensation in a instruments utilize-(OP-15) A.bimetal strip principal B.as in A to the altimeter & ASI C. as in B & also applies to VSI & EGT indicator 17.Bimetallic strip is formed of – of –(OP-15)A. (OP-15)A. a form of steel with 36% Ni c antent B. as in A & with neglible coff. Of linear expensoin 18.In an pressurised a/c the internal atm. Pressure condition r increasesd to a value > that prevailing at the altitude at which a/c flying to withstand this pressure (OP-17/18) A. bourden tube & capsule like instruments r connected to pressure source by using sealed case & venting them to outside atm. B. some instruments filled by N2 & hermatically sealed C. some instruments filled by He & hermatically sealed D. all of the above 19.MTCS- (OP-19) A.most comman form of D/P r quantative & qualitive D/P B.principle methods by which instruments may be displayed r-circule/digital/vadar/straight C.ROCI use non linear D/P or lograthmic scale D. all of the above 20.MTCS-the head up D/P used in a/c-()A. known as VAM B. airborne equivalent of VASI C. as in A it aids pilot when approach to land in airfield not equipped with VASI or ILS / other approach aidsD. all of the above & it provides cues like vertical approach angle ,horizontal attitude & speed error

21.How is flangeless inst. Case mounted in an inst. Panel(OP-44) A. by an expanding type clamp secured to back of panel & tightened by the screw from front of inst. Panel 22.The property of a good conductor – conductor –(15A-494)A. (15A-494)A. low voltage drop B. low power rating C. high voltage drop

23.The cabin pressurization in the ground gr ound is restricted by (FAA-)A. main landing gear operated microswitch

24.Crkts that have I/P, logic network ,O/P, & memory r (BLT-2576)


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Aviation World (www.dgcaquestionpapers.blogsp (www.dgcaquestionpapers.blogspot.com) ot.com) A. sequential logic B.series crkt C.parall crkt 25.Convert decimal number 35 into XS-3 code (BLT-2553)A . 01101000 B. 01110000 C. 11000011

26.In a 4 pole ,3 phase motor running with a frequency of 50 Hz AC I/P. calculate the speed of the magnetic field of the stator (BLT-) A. 1500 B. 2000 C. 500 D. 1000 27. One of the basic requirement of the servomotor is that it must produce high torque at all (BLT1567)A. speed B. voltage C. power D. load

28.The most comman 2 phase servomotor differ from a standard AC induction motor because it has (BLT- 1567) A. high rotor resistenceB. low rotor resistance C. high I/P voltage 29.The CMOS used in IC chips mostly because of (BLT-2630) A. high packing density B.low packing dyensity C.low power dissipation 30.In the diluter demand O2 regulator ,when does the demand valve operates? (FAA -79)A. when diluter control set at normal B. when user dmands 100% O2C. when the user breathes

31.In a high presuure O2 system , if pressure reducer fails ,what prevents high pressure O2 from entering the system downsteam (FAA-80) A. check valve

B. pressure relief valve

C. manifold control valve 32. What is the fixed line mark attached to the bowl of a magnetic compass called?(FAA-83) A. reeder line B. lubber line C. reference line 33.What will the result if the inst. Static pressure line becomes disconnected inside a pressurized cabin during crusing flight (FAA-83) A. altimeter & ASI both will read lowB. altimeter & ASI both will read high C. altimeter will read low & ASI will read high Share your documents with us at ([email protected] ([email protected])) OR www.facebook.com/aviatorsworld

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Aviation World (www.dgcaquestionpapers.blogsp (www.dgcaquestionpapers.blogspot.com) ot.com) 34.Which statement regarding an a/c inst. Vaccum system is true (FAA-84) A. dry type vaccum pumps with carbon vanes r very susceptible to damage from solid airborne particles & must take in only filtered air

35.The operation of an AOA indicator system is based on detection of diff. pressure at a point where the airstream flows in a direction (FAA-85) A. not parall to true AOA of a/cB. a/ cB. parall to true AOA of a/c a/ c C. parall to long. Axis of a/c 36.Turbine engine EGT r measured by (FAA-85) A. iron/constantan thermocouple B.chromel/alumel thermocouple C. ratiometer electrical resistance thermocouple 37.The rad radial lines on the face of an engine oil pressure gauge gaug e indicates(FAA-89) A. mini. engine safe rpm operating range B. mini. precautionary safe rpm operating rangeC. mini. & or maxi. Safe operating range

38.Dutch roll , a combination of yawing & rolling oscillation that affects many sweptwing a/c , is counteracted with (FAA-90) A. FDS

B. an aeliron dampar system

C. a yaw damper system 39.In an autopilot, which signal nullifies the i/p signals to the ailerons(FAA-91) A. displacement signal B. course signalC. followup signal

40.Instrument transformer used in……… A. voltmeter B. ammeter C. wattmeter

D. all of the above

41. Which one hold is related to autopilot () A. stability hold

B. localizer hold

C. airspeed hold

D. all of the above

42.Drain 42.Drain holes locted………..in the pitot static probe A. underside of pressure headB. in i n front of pressure head C. lowerside of pressure head 43.At some AOA , the velocity of airfiowA. increase over upper surface of wing & pressure decrease Share your documents with us at ([email protected] ([email protected])) OR www.facebook.com/aviatorsworld

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Aviation World (www.dgcaquestionpapers.blogsp (www.dgcaquestionpapers.blogspot.com) ot.com) B.decrese over upper surface of wing & pressure decrease C.decrese over upper surface of wing & pressure increased

44.GA mode can be engged -(AFCS-290)A. RA<2000 feet & autothrottle enggedB. RA>2000 feet & autothrottle engged C. RA=2000feet & autothrottle disengaged 45.If pitot probe blocked & drain holes open in ASI during decend A. overread

B. underread

C. not read 46. If X & i/p i/ p of a CRO r rpectively vsin(wt) & -vsin(wt) the resulting lissajous pattern lissajous pattern will be A. straight line B. curved line C.both A & B 47.Highest temp increased on emitter in transistor is-A. oxide coated emitter upto 3650 degree C B. oxide coated emitter upto 3650 degree F C. oxide coated emitter upto 3650 degree K

48.The white arc in ASI will indicates () A. appropriate a/s range over which an a/c a/ c ‘s landing flaps may be extended to take off , approach & landing configuration 49.IF rate of climb of cabin c abin altimeter is too great ,then A. safety valve will close too faster B. safety valve will close too slower C. safety valve will close too modratee 50.The most sensetive air data inst. I s

A. ROCI C. altimeter

B. AS I D. machmeter

51.When gyroscope axis is alined with long. Axis of a/c ,during roll A. gimbal error will not occur B. gimbal error will occur C. gimbal will not occur in pitch attitude also 52.If there is not a good electric contact b/w static discharger & base A . it should be removed & contact surface cleaned B. replace with the new one C. both A & B

53.The pinch off voltage isShare your documents with us at ([email protected] ([email protected])) OR www.facebook.com/aviatorsworld

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Aviation World (www.dgcaquestionpapers.blogsp (www.dgcaquestionpapers.blogspot.com) ot.com) A. Vds=mini. , Idmaxi. & constant, & Vgs =0 B.Vds=mini. , Idmaxi. & constant, & Vgs =maxi C.Vds=maxi. , Idmaxi. & constant, & Vgs =maxi 54. When making a temperory flight plan in FMS () A. f/o has no access to flight plan but he can review the active flight plan in a normal way B.f/o has access to flight plan but he can’t review the active flight plan in a normal way C.f/o has access to flight plan but he can review the active flight plan in a normal way 55. The flight control surfaces of a/c r aerodynamically balancd 4(AFCS-28) A. stability stability B. controliability . to assist pilot by reducing the pilot’s physical effort in controlling the a/c D. all of the above 56. In case of ASI – ASI – Error

compansation

A. Posi Positiv tivel ely y incr increa ease sed d towa toward rdss highe higherr end end

bime bimetal talli licc strip strip move moved d away away from from r

B. positively increased t hrouhout hrouhout the range

bimetallic bimetallic strip moved away from rockin

57. Rapid response type of thermocouple is used for (NIP-283) A. turbopropeller a/c C. piston engine a/c

B. turbine a/c C. all of the above

58.The profile drag includes ( AFCS-07)A. Form , interference , skin friction drag

59.In EGT indicator , thermocouple made of A. Chromel ( +) , alumel (-) 60.The force balance transducer of ADC is (NP-164)A. electromechanical type

61.Engine vibration monitoring system A.pick up unit at 90 degree to engine axis B.amplifier monitoring unit indicates vibration amplitude C.microammeter indicates vibration amplitude D. all of the above 62.which of the following transducer not used for pressure sensing?A. photoelectric

63.If gyro rotor speed of rotation greater then A. smaller the rate of precesion 64.In TSI , the speed of gyro is maintened constant by A. Centrifugal governor mech. Share your documents with us at ([email protected] ([email protected])) OR www.facebook.com/aviatorsworld

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Aviation World (www.dgcaquestionpapers.blogsp (www.dgcaquestionpapers.blogspot.com) ot.com) B. Constant frequency AC motorC. Both A and B

65.The ADC gives its output to (AFCS-173) A. EEC

B.GPWS

C. INS

D. All of the above

66. The earth axis rotation rate is A. 15 Degree per hrs.

B. 20 Degree/ hr

67.In transformer…….. directly perportional to square of voltage & will decrease when voltage increase A. iron loss. B. Eddy current loss C. Cu loss.

D. Regulation

68. MTCS- Conversion of 1 HP A. = 746 Watt

B. = 375 Miles Lbs/hrs

C. =550 Ft Lbs/ hrs

D. all of the above

69. The data transfer b/w A/C computer system, components and CPU by (EISMIN-147) A. Serial data

B. Parallel data

C. ARINC 429 70. MTCS w. r. t. DR/RR compass the deflection is maxi. At A.north magnetic heading & increase incr ease rapidly with distance B.south magnetic heading & increase rapidly with distance C.south magnetic heading & decrease rapidly with distance D.north magnetic heading & decrease rapidly with distance 71. MTCS- wrt stability (AFCS-11/12) A.static stability can’t be positive , negative & neutral but dynamic can be B.static stability is subsequent long term reaction which is of an oscillatory nature about a neutral or equilibrium position C.static stability is a prerequisite 4 dynamic stability although the converse is not true 72. Heading hold signals 4 an AFCS r supplied to the (AFCS-169/202) A. roll channel

B. pitch channel

C. yaw channel

D. none of the above

73.Azimuth information during an ILS approach is provided by signals from (AFCS-202/181)A. Share your documents with us at ([email protected] ([email protected])) OR www.facebook.com/aviatorsworld

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Aviation World (www.dgcaquestionpapers.blogsp (www.dgcaquestionpapers.blogspot.com) ot.com) the glideslope Tx B. marker beaconsC. the localizer Tx

74.In IAS mode of FDS – FDS –MTCS MTCS (AFCS-266) A. selected to maintain a particular IAS during climbout, after take off, & during letdown over a VOR station B.command bars provide vertical guidance C. both A & B 75.The TO-FROM indicator of an HSI is in operation when-(AFCS-276)A. either the VOR or LOC mode is selected B. only the VOR mode is selectedC. a heading change is selected

76.When failure of data signals occurs , indication is given on EFIS D/P units by flags displayed in (AFCS-276) A. red B. magenta C. yellow 77. Which synchro is used 4 precise angular measurements (NP-136) A. resolver synchro B. torque synchro C. control synchro

D. differential synchro

78. MTCS-in CDI/HIS (NP-216) A. a/c symbol fixed at centre shows the heading/ position wrt compass card & VOR/ LOC deviation bar 79. In IRS/INS ‘s computer we insert …….at the time of initially starting & alining a system prior commencement of a flight (NP-257) A. longitude & latitude

B. final destination

C. no. of intermidate waypoints

D. all of the above

80. MTCS wrt RA in EFIS (NP-300) A. RA is digitally displayed during an approach & a/c is b/w 2500 & 1000 ft above ground level B.below 1000ft D/P automatically changes to a white circular scale calibrated in increments of 10 ft C.as in B & selected DH displayed as a magenta COLOURED marker on the white scale D.at DH+500 ft aural alert chime sound increased with increased rate until DH reached 81.the leads made of the same materials as the thermocouples is called (NP-324) A. extension leads B. compensating leads C. both A & B

C. none of the above


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Aviation World (www.dgcaquestionpapers.blogsp (www.dgcaquestionpapers.blogspot.com) ot.com)

82. In compansator type tank probe MTCS (NP-336) A. inner ,outer tubes have low impedance & middle tube have high im pedance

83.the purpose of rotor composite construction, 1 part soft iron laminations, & other part a laminated 2 pole permanent magnet (OP-245) A.rotor combine the self starting & high torque properties of a squirrel cage motor B. self synchronous properties of a permsnent magnet motor C.both A & B 84.the parallax error is minimized by(OP-23) A. plateform scale & tilting inst. Panel 15 degree forward from vertical


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Is June 2013

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