Mcq or multiple choice question with answer for Refrigeration and air conditioning in a Compressors of the part : - 2
31. The screw compressor the male rotor is driven by————
a. Piston, b. Electric motor, c. Both and b, d. Engine
Ans. b. Electric motor
32. The rotates of the screw compressor it's companion female rotor in the———— direction of the male rotor.
a. Opposite, b. Clockwise, c. Both and b, d. None of this
Ans. a. Opposite
33. Double acting compressor compresses gas ———— charges per revolution of the crank shaft.
a. Three, b. Four, c. Two, d. One
34. A centrifugal compressor fitted in a refrigeration plant with a 1000 to 2000 tons and ———— r. p. m. Of the speed.
a. 3000 to 6000 , b. 100 to 600, c. 100 to 400, d. 3500 to 4000
Ans. d. 3500 to 4000
35. The piston ring is made of ————
a. Cast iron, b. Steel, c. Cast steel, d. None of this
Ans. a. Cast iron
36. Welded sealed units are generally available from 1/12 horse power to ———— horse power.
a. 10, b. 2, c. 5, d. 6
Ans. b. 2
37. The main part of the sealed unit is ———— and ————.
a. Compressor and piston, b. Connecting rod and piston, c. Compressor and motor, d. Oil and gas
Ans. c. Compressor and motor
38. In a sealed unit ———— capacitor used in motor or compressor.
a. Start, b. Run, c. Both and b, d. Ohms
Ans. c. Both and b
39. The Advantage of the wet compression is ————.
a. Heated of the compressor, b.cooling the compressor, c. Stop the compressor, d. Defect of the compressor
Ans. b. Cooling of the compressor
40. The following factors which reduce the volumetric efficiency of the compressor is ————.
a. Large clearance poket, b. Too much leakage through valves, c. Both and b, d. Small clearance pocket
Ans. c. Both and b
41. Wet compression means is ————
a. Uuvapourised liquid from the Evaporator are compressed by the compressor
b. Compressed the gas of the compressor
c. Condensed the gas of the condenser
d. Stop the compressor
Ans. a. Uuvapourised liquid from the Evaporator are compressed by the compressor
42. The single acting compressor ———— charge is compressed gas in the cylinder.
a. Only two, b. Only one, c. Both a and b, d. None of this
Ans. b. Only one
43. The single acting compressor during ———— revolution of the crank case.
a. One, b. Two, c. Three, d. Four
Ans, a. One
44. Parts of the wobble or swash plate compressor is ————
a. Cylinder, b. Piston, c. Suction valve, Discharge valve, d. All of this
Ans, d. All of this
45. The wobble or swash plate has a link with ———— .
a. Head plate, b. Valve plate, c. Piston, d. Suction valve
Ans, c. Piston
46. The screw compressor has a main body made of ————
a. Cast iron, b. Cast steel, c. Both and b, d. Steel
Ans, a. Cast iron
47. The low pressure suction gas enters from one end of the screw compressor and by passing through the threads or grooves it is ———— in lower volume to raise its pressure.
a. Compressor, b. Compressed, c. Condenses, d. Evaporated
Ans, b. Compressed
48. The scroll compressor has ———— spiral bodies.
a. Two, b. Three, c. One, d. Four
Ans, a. Two
49. The small spiral body of scroll compressor is fitted in the large size ———— body.
a. Cylinder, b. Chamber, c. Spiral, d. Pump
Ans, c. Spiral
50. Leak proof electric terminals of the scroll compressor are fitted on the ———— for connecting it to electric supply.
a. Dome, b. side, c. bottom, d. suction pipe
Ans, a. Dome
51. The oil Separator is a fitted in the ———— line.
a. Suction line, b. Discharge line, c. Both and b, liquid line
Ans, b. Discharge line
52. The centrifugal compressor works on the principal of centrifugal force and ———— are not necessary.
a. Main body, b. Impeller, c. Valves, d. Rotor
Ans, c. Valves
53. The oil return of the oil separator it the ———— of the compressor.
a. Head, b. Valve, c. Piston, d. Crank case
Ans, d. Crank case
54. The oil separator ———— shape.
a. Cylindrical shall, b. Core, c. Cube, d. None of this
Ans, a. Cylindrical shall
55. The speed of the compressor and motor is ———— in the sealed unit.
a. Low, b. High, c. Both and b, d. Same
Ans, d. Same
56. Domestic sealed unit are generally run by the A. C ———— supply.
a. Single phase, b. Three phase, c. Both and b, d. None of this
Ans, a. Single phase
57. Crank case oil heater is fitted in large reciprocating compressor keeping the oil ————.
a. Cooling, b. Heating, c. Vapour, d. Liquid
Ans, b. Heating
58. Compressor or motor speed measure in R. P. M. Is called ———— .
a. Techo meter, b. Volt metel, c. Amper meter, d. Ohms meter
Ans, a. Techo meter
59. Total cylinder volume swept by the piston in any certain time ———— of compressor.
a. Negative, b. Dynamic, c. Piston displacement, d. Piston
Ans, c. Piston displacement
60. Low side part of the compressor is ————.
a. Discharge valve, b. discharge line , c. Suction valve, d. None of this
Ans, c. Suction valve
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