Mcq or multiple choice question with answer for Refrigeration and air conditioning in a Compressors of the part : - 1
1. Reciprocating compressor in which a piston moves in a ––––––––– in reciprocating motion.
a. cylinder, b. Crank case c. Head plate, d. Gasket
Ans. a.Cylinder
2. Compressor suc the refrigerant vapour to compresses then discharge refrigerant————— to the discharge line.
a. Liquid, b. Brine, c. Low pressure, d. Vapour
Ans. d. Vapour
3. Compressor and motor are assembly in a single dome is called a—————unit.
a. Open, b. Semi - sealed, c. Sealed, d. None of this
Ans. C. Sealed
4. The body of reciprocating compressor is made of —————.
a. Cast steel, b. Cast iron, c. Steel, d. None of this
Ans. b. Cast iron
5. Inline compressor are commonly direct driven by the ——————.
a. Electric motor or diesel engines, b. Compressor, c. Both and b, d. none of this
Ans. a. Electric motor or diesel engines
6. The piston of compressor is made of best grade ——————.
a. Steel, b. Stainless steel, c. Cast iron, d. Cast steel
Ans. c. Cast iron
7. The wobble or swash compressor are of ————and———— acting type.
a. Multi and double, b. Single and double, c. both and b, d. Three and four
Ans. b. Single and double
8. The wobble or swash compressor above action the piston in the cylinders Complete their suction and discharge stroke by ———motion.
a. Reciprocating, b. Rotary, c. Centrifugal, d. Axial
Ans. a. Reciprocating
9. The wobble or swash compressor are Multi cylinder, that means such type of compressor have as —————pistons, suction valve and discharge valve as the number of cylinder.
a. Big, b. Small, c. Less, d. Many
Ans. d. Many
10. The cylinders of ———— stages are found in a straight line when seen from top of the in line reciprocating compressor.
a. Various, b. Low, c. High, d. Medium
Ans. a. Various
11. The reciprocating inline compressor are most commonly used compressors with ———— pressure range.
a. Fixed, b. Low, c. High, d. Varying
Ans. d. Varying
12. V - shaped in large compressor is cooled by ———— .
a. air, b. Water, c. Gas, d. None of this
Ans. b. Water
13. The similarly the multi stage compressor gas to through in ———— of stage.
a. Number, b. One, c. Two, d. Three
Ans. a. Number
14. in a multistage compressor are usually of ———— type.
a. Horizontal, b. Vertical, c. Core, d. None of this
Ans. a. Horizontal
15. The screw compressor has a ———— rotors in the shape of screws.
a. Two, b. Three, c. Four, d. Six
Ans. a. Two
16. ———— is domestically not used with a machine equipped with sealed unit.
a. Piston, b. Connecting rod, c. Motor, d. Receiver
Ans. d. Receiver
17. Generally ———— is used as a metering device in a machine equipped with sealed unit.
a. Capillary tube, b. Low side, c. High side, d. Thermostatic
Ans. a. Capillary tube
18. Generally service valve are not used in ————
a. Sealed unit, b. Open unit, c. Both and b, d. V shaped
Ans. a. Sealed unit
19. The shaft seal dose not require in ———-
a. Open unit, b. Sealed unit, c. Both and b, d. None of this
Ans. b. Sealed unit
20. In the single acting compressor the gas is compressed in ————
a. Two, b. Three, c. Only one, d. Four
Ans. C. Only one
21. Double acting compressor are usually of ———— type.
a. Vertical, b. Horizontal, c.Core,d.none of this
Ans. a. Vertical
22. What are types of the rotary compressor?
a. Three, b. Two, c. Four,d.one
Ans. b. Two
23. The multi stage compressor gas is compressed again in ————
a. Condenser, b. Intercooler, c. Other compressor d. Both and b
Ans. C. Other compressor
24. The single acting compressor are in usually of ———— type.
a. Vertical, b. Horizontal, c. Both and b, d. None of this
Ans. b. Horizontal
25. A screw compressor one rotor is called male and the other is called ———— rotor.
a. Female, b. Male, c. Both and b, d. None of this
Ans. a. Female
26. The small centrifugal compressor have ———— impeller.
a Three or four, b. One or two, c. Five or six, d. Nine or ten
Ans. One or two
27. What range of the temperature a centrifugal compressor is suitable?
a. 40°f to 100° f, b. 70° f to 180° f, c. 90° f to 200° f, d. 50° f to 130° f.
Ans. d. 50° f to 130° f
28. The main part of a centrifugal compressor ————
a. Main body, b. Suitable inlet and outlet, c. Rotor or impeller, d. All of this
Ans. d. All of this
29. The size of the gasket depends upon its ————
a. Thickness, b. Volume, c. Diameter, d. Depth
Ans. a. Thickness
30. The compressor is off the crank case oil heater is ————
a. Off, b. Forward, c. Both and b, d. On
Ans. d. On
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