Super heating in a refrigeration cycle __________________?

A. Increases cop
B. Decreases cop
C. Cop remains unaltered
D. Other factors decide cop

For obtaining high COP, the pressure range of compressor should be_______________?

A. High
B. Low
C. Optimum
D. Any value

The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature constant, will______________________?

A. Increase
B. Decrease
C. Remain unaffected
D. May increase or decrease depending on the type of refrigerant used

Most of the domestic refrigerators work on the following refrigeration system _________________?

A. Vapour compression
B. Vapour absorption
C. Carnot cycle
D. Electrolux refrigerator

Reducing suction pressure in refrigeration cycle_________________?

A. lowers evaporation temperature
B. increases power required per ton of refrigeration
C. lowers compressor capacity because vapour is lighter
D. reduces weight displaced by piston

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

Which of the following refrigerants has lowest freezing point_______________?

A. Freon-12
B. Nh3
C. C02
D. Freon-22

The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P_____________________?

A. More
B. Less
C. Equally.
D. Unpredictable

The COP of a vapor compression plant in comparison to vapor absorption plant is ________________?

A. More
B. Less
C. Same
D. More/less depending on size of plant

The evolution of heat of solution takes place in ammonia absorption plant when _____________________?

A. Ammonia vapour goes into solution
B. Ammonia vapour is driven out of solution
C. Lithium bromide mixes with ammonia
D. Weak solution mixes with strong solution