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.Management Sciences
Category: Refrigeration and Air Conditioning
The COP of a domestic refrigerator___________________?
A. is less than 1
B. is more than 1
C. is equal to 1
D. depends upon the make
E. depends upon the weather conditions
Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system ?
A. strong solution to weak solution
B. weak solution to strong solution
C. strong solution to ammonia vapour
D. ammonia vapour to weak solution
E. ammonia vapour to strong solution
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant_________________?
A. decreases
B. increases
C. remains same
D. depends on other factors
E. none of the above
The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is_________________?
A. same
B. more
C. less
D. more or less depending on ambient conditions
E. unpredictable
Clapeyron equation is applicable for registration at___________________?
A. saturation point of vapor
B. saturation point of liquid
C. sublimation temperature
D. triple point
E. critical point
Moisture in freon refrigeration system causes________________?
A. ineffective refrigeration
B. high power consumption
C. freezing automatic regulating valve
D. corrosion of whole system
E. breakdown of refrigerant
The relative coefficient of performance is_____________________?
A. actual COP/fheoretical COP
B. theoretical COP/actual COP
C. actual COP x theoretical COP
D. 1-actual COP x theoretical COP
E. 1-actual COP/fheoretical COP.
One of the purposes of sub-cooling the liquid refrigerant is to________________?
A. reduce compressor overheating
B. reduce compressor discharge temperature
C. increase cooling effect
D. ensure that only liquid and not the vapour enters the expansion (throttling) valve
E. none of the above
For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet and atmosphere is high, then_________________?
A. bigger cabinet should be used
B. smaller cabinet should be used
C. perfectly tight vapour seal should be used
D. refrigerant with lower evaporation temperature should be used
E. refrigerant with high boiling point must be used
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