Where does the lowest temperature occur in a vapour compression cycle?

The lowest temperature during the cycle in a vapour compression system occurs after

A

Compression

B

Expansion

C

Condensation

D

Evaporation

In vapour compression cycle the condition off refrigerant is dry saturated vapour

A

After passing through the condenser

B

Before passing through the condenser

C

After passing through the expansion or throttle valve

D

Before entering the compressor

In vapour compression cycle, the condition of refrigerant is very wet vapour

A

After passing through the condenser

B

Before passing through the condenser

C

After passing through the expansion or throttle valve

D

Before entering the compressor

In vapour compression cycle the condition of refrigerant is superheated vapour

A

After passing through the condenser

B

Before passing through the condenser

C

After passing through the expansion or throttle valve

D

Before entering the expansion valve

The temperature of ammonia after compression in a vapour compression system is

A

20 to 50°C

B

50 to 70°C

C

70 to 110°C

D

None of these

In a vapour compression system, the condition of refrigerant is dry saturated vapour

A

Before entering the compressor

B

After leaving the compressor

C

Before entering the condenser

D

After leaving the condenser

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

The higher temperature in vapour compression cycle occurs at

A

Receiver

B

Expansion valve

C

Evaporator

D

Compressor discharge

Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle

A

Heat rejection is lower

B

Expansion and compression are isentropic

C

Combustion is at constant volume

D

Maximum temperature is higher

Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in

A

Increased COP

B

Same COP

C

Decreased COP

D

Increased or decreased COP ; depending upon the type of refrigerant

Where does the lowest temperature occur in a vapour compression cycle?

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