Refrigeration And Air Conditioning question and answer for competitive exams
21. A refrigerant with highest critical pressure is –
(A) Carbon-dioxide
(B) Ammonia
(C) Freon-11
(D) Freon-22
22. The leakage in a refrigeration system using Freon is detected by
(A) Soap and water
(B) Sulphur sticks
(C) Halide torch
(D) All of the above
23. In order to obtain high C.O.P., the pressure range of compressor should be
(A) Low `
(B) High
(C) Optimum
(D) Any value
24. The refrigerant commonly used in commercial ice plants.
(A) Brine
(B) Water
(C) Ammonia
(D) Freon – 12
25. Leakage in the refrigeration system using ammonia as refrigerant is detected by
(A) Soap and water
(B) Burning candle
(C) Sulphur sticks
(D) Halide torch
26. Where is secondary refrigerant invariably used?
(A) Domestic refrigerators
(B) Ice plants
(C) Deep freezers
(D) Water coolers
27. Which of the following refrigerants has the lowest boiling point?
(A) Freon- 12
(B) Carbon-dioxide
(C) Ammonia
(D) Sulphur dioxide
28. The C.O.P. of a domestic refrigerator in comparison to domestic air conditioner will be
(A) Less
(B) Same
(C) More
(D) Unpredictable
29. When two refrigerants are mixed in proper proportions, the mixture forms a third refrigerant called
(A) Auxiliary
(B) An zoetrope
(C) Synthetic
(D) None of the above
30. An Electrolux refrigerator works on ………….system.
(A) Vortex tube
(B) Absorption refrigerant
(C) Vapour compression
(D) Steam refrigeration
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