Highest temperature encountered in refrigeration cycle should be________________?

A. Near critical temperature of refrigerant
B. Above critical temperature
C. At critica. temperature
D. Much below critical temperature

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

In a refrigeration system, heat absorbed in comparison to heat rejected is_________________?

A. More
B. Less
C. Same
D. More for small capacity and less for high capacity

Formation of frost on evaporator in refrigerator ________________?

A. Results in loss of heat due to poor heat transfer
B. Increases heat transfer rate
C. Is immaterial
D. Can be avoided by proper design

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

Which of the following is not a desirable property of a refrigerant_________________?

A. High triiscibility with oil
B. Low boiling point
C. Good electrical conductor
D. Large latent heat

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

If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be________________?

A. Same
B. More
C. Less
D. More/less depending on rating

Highest pressure encountered in a refrigeration system should be________________?

A. Critical pressure of refrigerant
B. Much below critical pressure
C. Much above critical pressure
D. Near critical pressure

A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is________________?

A. Ammonia
B. Carbon dioxide
C. Freon
D. Brine