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Chapter:

20+ Vapour Compression Refrigeration Solved MCQs

in Refrigeration and Air conditioning

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .

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Chapter: Vapour Compression Refrigeration
1.

Heat is absorbed by the refrigerant, during vapour compression refrigeration cycle in

A. Compressor
B. Condenser
C. Evaporator
D. Throttle valve
Answer» C. Evaporator
discuss
2.

In a simple saturated vapour compression cycle, the refrigerant is in superheated condition

A. before entering compressor
B. before entering condenser
C. before entering throttle valve
D. before entering evaporator
Answer» B. before entering condenser
discuss
3.

Sub-cooling is a process of cooling the refrigerant in vapour compression refrigeration system

A. after compression
B. before compression
C. before Throttling
D. none of the above
Answer» C. before Throttling
discuss
4.

The order in which main components of vapour compression refrigeration system are used is

A. compressor-evaporator-condenser-throttle valve
B. compressor-condenser-evaporator-throttle valve
C. compressor-throttle valve- evaporator-condenser
D. compressor-condenser- throttle valve- evaporator
Answer» D. compressor-condenser- throttle valve- evaporator
discuss
5.

The oil separator is incorporated in vapour compression refrigeration system

A. between evaporator and compressor
B. between compressor and condenser
C. between condenser and Throttle valve
D. between throttle valve and evaporator
Answer» B. between compressor and condenser
discuss
6.

In vapour compression refrigeration cycle the following data is available Heat rejected in condenser = 65 KW Work done in compressor = 10 kw, then COP( refrigerator) is

A. 4.5
B. 5.5
C. 6.5
D. not possible to find with the given data
Answer» B. 5.5
discuss
7.

Following results are tabulated for vapour compression refrigeration cycle.
Enthalpy at suction = 190 kJ/kg
Enthalpy at discharge from compressor = 210 kJ/kg
Enthalpy at exit from condenser = 80 kJ/kg
COP of cycle would be

A. 3.5
B. 4.5
C. 5.5
D. 6.5
Answer» C. 5.5
discuss
8.

For simple saturated vapour compression refrigeration cycle operating between 5°C and 40°C, and the refrigerants being R-11, R-12, R-717 and R-22, the evaporator pressure is lowest for

A. R-11
B. R-12
C. R-717
D. R-22
Answer» A. R-11
discuss
9.

For simple saturated vapour compression refrigeration cycle operating between 5°C and 40°C, and the refrigerants being R-11, R-12, R-717 and R-22, the compressor displacement per min per ton of refrigeration is highest for

A. R-11
B. R-12
C. R-717
D. R-22
Answer» A. R-11
discuss
10.

With reciprocating compressor in vapour compression refrigeration system, wetcompression is not desirable because

A. liquid trapped up in the head of cylinder may damage the compressor valves
B. COP of the cycle decreases
C. volumetric efficiency of compressor decreases
D. mass flow rate per ton of refrigerant increases
Answer» A. liquid trapped up in the head of cylinder may damage the compressor valves
discuss
11.

An ideal refrigerant should have

A. low latent heat of vaporization
B. high critical temperature
C. high boiling point
D. high specific volume of vapour
Answer» B. high critical temperature
discuss
12.

The refrigerant leaving throttle valve is

A. saturated liquid
B. saturated vapour
C. superheated vapour
D. fraction as saturated vapour and remainder as liquid
Answer» D. fraction as saturated vapour and remainder as liquid
discuss
13.

Freon group of refrigerants

A. toxic
B. inflammable
C. non-toxic and non-inflammable
D. highly toxic and inflammable
Answer» C. non-toxic and non-inflammable
discuss
14.

The leaks of refrigerant from a cycle may be detected by

A. halide torch test
B. sulphur candle test
C. soap and water test
D. any of the above
Answer» D. any of the above
discuss
15.

During compression in a vapour compression cycle the refrigerant is super heated

A. work done is increased
B. C.O.P is increased
C. Work done is reduced
D. Refrigerating effect is reduced
Answer» A. work done is increased
discuss
16.

Heat is rejected by the refrigerant, during vapour compression refrigeration cycle in

A. Compressor
B. Condenser
C. Evaporator
D. Throttle valve
Answer» B. Condenser
discuss
17.

Wet compression vapour compression refrigeration cycle means

A. Vapour compression takes place in wet region
B. Vapour compression in dry region, but evaporation in wet region
C. vapour compression in wet region, but leaves in superheated region
D. None of the above
Answer» A. Vapour compression takes place in wet region
discuss
18.

For simple saturated vapour compression refrigeration cycle operating between 5°C and 40°C, and the refrigerants being R-11, R-12, R-717 and R-22, the evaporator pressure is highest for

A. R-11
B. R-12
C. R-717
D. R-22
Answer» D. R-22
discuss
19.

With reciprocating compressor in vapour compression refrigeration system, wet compression is not desirable because

A. liquid trapped up in the head of cylinder may damage the compressor valves
B. COP of the cycle decreases
C. volumetric efficiency of compressor decreases
D. mass flow rate per ton of refrigerant increases
Answer» A. liquid trapped up in the head of cylinder may damage the compressor valves
discuss
20.

An ideal refrigerant should have

A. low latent heat of vaporization
B. lower critical temperature
C. lower boiling point
D. high specific volume of vapour
Answer» C. lower boiling point
discuss
21.

During compression in a vapour compression cycle the refrigerant is super heated

A. C.O.P is reduced
B. C.O.P is increased
C. Work done is reduced
D. Refrigerating effect is reduced
Answer» A. C.O.P is reduced
discuss

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