16. Air refrigeration cycle is used in –
A. domestic refrigerators
B. air-conditioning
C. gas liquefaction
D. commercial refrigerators
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18. The wet-bulb depression is zero when relative humidity is –
A. 0
B. 0.5
C. 0.75
D. 1
19. A condenser of the refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be –
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A. 1/3
B. 1/4
C. 3
D. 4
20. A refrigerant with the highest critical pressure is –
A. R-11
B. R-12
C. Ammonia
D. R-22