Name Of Candidate
Total Experience:
Interview on:
Inteviewed by:
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Page 1/5
Q1
What What are are the the stan standa dard rds s use use in A/C A/C duc ductt fab fabri rica cati tion on? ?
Ans
SMACNA US ,dw 142
Q2
What What are are the the diff differ eren entt met metho hod d use used d for for duct duct sizi sizing ng? ?
Ans
Equal Friction, Velocity,Static Velocity,Static Regain. Regain.
Q3
What What are th the con conver versio sion of of fol follo low wing? ing? 1CFM 1CFM= = 0.47 0.472L 2LPS PS 1CM 1CMH= 0.58 0.588C 8CFM FM 1inch= 25.4mm 1LPS= 15.8GPM
Q4
Clas Classi sify fy the the air cond condit itio ioni ning ng Unit Units? s?
Ans
Window, Split, Chiller, DX, DX, Package Unit etc.
Q5
W ha hat is the use of strainer?
Ans
It is installed before the the cooling coil to protect protect dirt & foreign material material entering into the cooling coil / evaporator.
Q6
How How do do you you meas measur ure e & cont contro roll the the nois noise e lev level el in A/C A/C sys syste tem? m?
Ans
Noise level can be measured measured by dB meter.It can be controlled controlled by providing providing acoustic to the the unit panels, if the sound crosses the set noise criteria we have to go f or sound attenuatos.
Q7
What What is the the use use of of str strai airc rcas ase e pres pressu suri riza zati tion on? ?
Ans
To provide fresh & clean clean air in the staircase staircase when fire occurs occurs in the floor. The pressurized air keeps the smoke away from the stair wall. It is used for creating positive pressure.
Q8
What What are are the the rec recom omme mend nded ed pres pressu sure re drop drop in Chil Chille led d wat water er pipe pipes? s?
Ans
210 PASCAL'S per per meter (0.84 inches).
Q9
Where Where do you you use use Fire Fire Damp Damper er,S ,Spl plit iter er Damp Damper er & Non Non Retu Return rn Damp Damper er? ?
Ans
Fire dampers (FD) are are used to stop the fire wherever wherever duct passes thro thro fire wall. . Spliter dampers(SD) are used to split the main duct for propotional air balancing Non Return Dampers(NRD) are used to stop the back flow of air in the duct. NRD's used in exhaust and ventilation system only.
Page 2/5
Q10
What is use of U-Trap and where it is used?
Ans
It is used in Drain connection as water seals/smell.
Q11
What are the different types of exhaust fans used to extract the air?
Ans
Axial type propeller fan, forward curved, twin fan, direct driven centrifugal fan.
Q12
What are different duct shapes normally used?
Ans
Rectangular, Round, Spiral, Oval.
Q13
How do you control vibration of AHU & Chillers?
Ans
Spring vibration isolators, Rubbers pads, Kinetic Chain, flexible bellows.
Q14
What is the difference between VAV & CAV?
Ans
Variable Air Volume & Constant Air Volume
Q15
What is the difference betwwen NRV & Check valve?
Ans
Both are same
Q16
Mention typical valve arrangement for chiller connection?
Q17
What do you consider while making plant room layout explain briefly?
Ans
Space, site orientation, plant room location, A/C unit (ready made or tailor made).
Q18
What are the different type of Louvers used?
Ans
Fresh air louvers, sand trap louvers, door louvers, acoustic louvers, supply air and return air louvers.back draft louvers.
Q19
Classify the different types of chillers?
Ans
Reciprocating,screw,centrifugal & scroll chillers.
Q20
What is the Primary & Secondry pump?Where it is used?
Ans
Primary Pump Supplies return water to chiller & Secondary Pump supplies supply water from chiller.
Page 3/5
Q21
What are the standard test pressure for chilled water piping for Industrial application?
Ans
Test pressure 1.5 times of working pressure.
Q22
What is VFD? & Where it is used?
Ans
Variable Frequency Drive it is used to control the speed of motor by controlling the frequency applied to it. It is used with Chillers,AHU etc.
Q23
Name some fine controlled Valves?
Ans
Needle valve,Spindle valve, regulating valve, motorized valved etc.
Q24
What are the Securities checking in chillers?
Ans
Flow switch, Chiller and Pump interlocking, High Pressure cut-out, Oil Pressure switch, High Suction superheat, Anti Freeze.
Q25
What are the temperature & RH required for human comfort?
Ans
22 ±2 degree celcius & 50%RH
Q26
What is Boiling Point temperature of water in Fahrenheit scale?
Ans
212 degree Fahrenheit?
Q27
At what temperature degree Ferhenite & degree Celcius are same?
Ans
-40°C
Q28
Which gas is used to purge the refrigerant line during the brazing?
Ans
Nitrogen gas.
Q29
1 TR=
Q30
How much design velocity required in the main duct of an office building?
Ans
900-1100 FPM
Q31
What should be the max distance between sewer line & portable water line?
Ans
3 meter
Q32
How much size of clean out is provided for sewer pipe below 10" dia?
Ans
6"
Q33
What should be height of fire cabinet from floor level?
Ans
1 meter
365 to 400 CFM 3.7KW
Page 4/5
Q34
What are the different types of sprinkler heads used in fire protection system?
Ans
Upright sprinkler,Pendent Recessed sprinkler,Pendent sprinkler,Side wall sprinkler,extended side wall sprinker.
Q35
What is standered for fire protection system?
Ans
NFPA
Q36
What is the test pressure for fire fighting pipe network?
Ans
1.5 times of working pressure.
Q37
What is the temperature rating for fire fighting sprinkler head?
Ans
170°F
Q38
What is the fire department connection known as?
Ans
Siamese
Q39
Name the different types of fire extinguisher?
Ans
Portable type CO2,Portable type Dry Powder & water.
Q40
What are the different types of Pump used in fire protection system?
Ans
Main Pump,Jockey Pump & In case of power failure Diesel driven pump.
Q41
What are the different types of Valve used in fire protection system?
Ans
Alarm valve,Zonal valve etc.
Q42
Who gives final approval to fire fighting network after installation?
Ans
Civil Defence.
Q43
What is the test pressure for domestic water supply pipe?
Ans
1.5 times of working pressure.
Q44
Name the different types of Traps used for Water Closet?
Ans
P-Trap & S-Trap.
Q45
What are the different pipe material used in plumbing installation?
Ans
CI,Acid resistant CI,Bituminous fiber pipe,virtified clay pipe,Lead pipe,Galvanized steel pipe, Galvanized wrought iron pipe,brass pipe,copper pipe,Plastic & synthetic pipe.
Q46
What are the impotant factor to consider while installing waste pipe?
Ans
Selection of right kind of material, Conservative use of fittings. Right location of cleanouts Right pitch or slop of pipe li ne. Manner of joining the pipe.
Name Of Candidate
Total Experience:
Interview on:
Inteviewed by:
Passport No:
Position:
Q1
What are the standards use in A/C duct fabrication?
Ans
Q2
What are the different method used for duct sizing?
Ans
Q3
What are the conversion of following? 1CFM= LPS 1CMH= CFM 1inch= mm 1LPS= GPM
Q4
Classify the air conditioning Units?
Ans
Q5
W hat is the use of strainer?
Ans
Q6
How do you measure & control the noise level in A/C system?
Ans
Q7
What is the use of straircase pressurization?
Ans
Q8
What are the recommended pressure drop in Chilled water pipes?
Ans Q9 Ans
Where do you use Fire Damper,Spliter Damper & Non Return Damper?
Page 1/4
Page 2/4
Q10
What is use of U-Trap and where it is used?
Ans
Q11
What are the different types of exhaust fans used to extract the air?
Ans
Q12
What are different duct shapes normally used?
Ans
Q13
How do you control vibration of AHU & Chillers?
Ans
Q14
What is the difference between VAV & CAV?
Ans
Q15
What is the difference betwwen NRV & Check valve?
Ans Q16
Mention typical valve arrangement for chiller connection?
Q17
What do you consider while making plant room layout explain briefly?
Ans
Q18
What are the different type of Louvers used?
Ans
Q19
Classify the different types of chillers?
Ans
Q20 Ans
What is the Primary & Secondry pump?Where it is used?
Page 3/4
Q21
What are the standard working & test pressure for chilled water piping for Industrial application?
Ans Q22
What is VFD? & Where it is used?
Ans
Q23
Name some fine controlled Valves?
Ans Q24
What are the Securities checking in chillers?
Ans
Q25
What are the temperature & RH required for human comfort?
Ans Q26
What is Boiling Point temperature of water in Fahrenheit scale?
Ans Q27
At what temperature degree Ferhenite & degree Celcius are same?
Ans Q28
Which gas is used to purge the refrigerant line during the brazing?
Ans Q29
1 TR=
CFM KW
Q30
How much design velocity required in the main duct of an office building?
Ans Q31
What should be the max distance between sewer line & portable water line?
Ans Q32
How much size of clean out is provided for sewer pipe below 10" dia?
Ans Q33 Ans
What should be height of fire cabinet from floor level?
Page 4/4
Q34
What are the different types of sprinkler heads used in fire protection system?
Q35
What is standered for fire protection system?
Q36
What is the test pressure for fire fighting pipe network?
Q37
What is the temperature rating for fire fighting sprinkler head?
Q38
What is the fire department connection known as?
Q39
Name the different types of fire extinguisher?
Q40
What are the different types of Pump used in fire protection system?
Q41
What are the different types of Valve used in fire protection system?
Q42
Who gives final approval to fire fighting network after installation?
Q43
What is the test pressure for domestic water supply pipe?
Q44
Name the different types of Traps used for Water Closet?
Q45
What are the different pipe material used in plumbing installation?
Q46
What are the impotant factor to consider while installing waste pipe?
