Which of the following is a widely used refrigerant in vapour compression refrigeration system (using large centrifugal compressor)?

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

In vapour compression refrigeration system, refrigerant occurs as liquid between

A

Condenser and expansion valve

B

Compressor and evaporator

C

Expansion valve and evaporator

D

Compressor and condenser

The condition of refrigerant as it leaves the compressor in a vapour compression system is

A

Saturated liquid

B

Wet vapour

C

Dry saturated vapour

D

Superheated vapour

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 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 variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet.

A

P, Q and R

B

P and R

C

R and S

D

P, R and S

Axial flow compressor has the following advantage over centrifugal compressor

A

Larger air handling ability per unit frontal area

B

Higher pressure ratio per stage

C

Aerofoil blades are used

D

Higher average velocities

In a centrifugal compressor, the flow of air is ________ to the axis of compressor.

A

Parallel

B

Perpendicular

C

Inclined

D

None of these

Which of the following is a widely used refrigerant in vapour compression refrigeration system (using large centrifugal compressor)?

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