Highest pressure encountered in a refrigeration system should be

Highest temperature encountered in refrigeration cycle should be

A

Near critical temperature of refrigerant

B

Above critical temperature

C

At critical Temperature

D

Much below critical temperature

The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system

A

Is as light as possible

B

Has very high C.O.P

C

Employs minimum quantity of refrigerant

D

Consumer minimum horse power

Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is

A

Positive

B

Negative

C

Zero

D

Infinity

One Ton of Refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice---

A

In 1 hour

B

In 24 hour

C

In 10 minutes

D

In 12 hour

A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?

A

Vapor compression cycle using expansion valve

B

Air refrigeration cycle

C

Vapor compression cycle using expansion engine

D

Carnot refrigeration cycle

In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by

A

Liquid pump

B

Generator

C

Absorber and generator

D

Absorber, generator and liquid pump

Which of the following is the result of a reduction in operating pressure in the Air refrigeration cycle?

A

decrease in C.O.P.

B

always decreases

C

increase in C.O.P.

D

no change in C.O.P.

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

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

All of the above

The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents

A

Condensation of the refrigerant vapour

B

Evaporation of the refrigerant liquid

C

Compression of the refrigerant vapour

D

Metering of the refrigerant liquid

Highest pressure encountered in a refrigeration system should be

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