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49.

Air refrigeration cycle is used in                        
A. domestic refrigerators B. commercial refrigerators
C. air conditioning D. gas liquefaction



50.

Allowable pressure on high-pressure side or ammonia absorption system is of the order of                        
A. atmospheric pressure B. slightly above atmospheric pressure
C. 2-4 bars D. 5-6 bars



51.

Ammonia-absorption refrigeration cycle requires                        
A. very little work input B. maximum work input
C. nearly same work input as for vapour compression cycle D. zero work input




52.

Clapeyron equation is applicable for registration at                        
A. saturation point of vapour B. saturation point of liquid
C. sublimation temperature D. triple point



53.

Critical pressure of a liquid is the pressure                        
A. above which liquid will remain liquid B. above which liquid becomes gas
C. above which liquid becomes vapour D. above which liquid becomes solid



54.

Critical temperature is' the temperature above which                        
A. a gas will never liquefy B. a gas will immediately liquefy
C. water will evaporate D. water will never evaporate



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