Explore topic-wise MCQs in Refrigeration.

This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Refrigeration knowledge and support exam preparation. Choose a topic below to get started.

1.

If a condenser and evaporator temperatures are 250 K and 100 K respectively, then reverse Carnot C.O.P is _________

A. 5.5
B. 1.5
C. 2.5
D. 3.0
Answer» D. 3.0
Discussion
2.

The C.O.P for reverse Carnot refrigerator is 2. The ratio of lowest temperature to highest temperature will be _____

A. twice
B. half
C. four times
D. three times
Answer» E.
Discussion
3.

If a condenser and evaporator temperatures are 312 K and 273 K respectively, then reverse Carnot C.O.P is _________

A. 5
B. 6
C. 7
D. 8
Answer» D. 8
Discussion
4.

The C.O.P. of reverse Carnot cycle is most strongly dependent on which of the following?

A. Evaporator temperature
B. Condenser temperature
C. Specific heat
D. Refrigerant
Answer» B. Condenser temperature
Discussion
5.

If a condenser and evaporator temperatures are 120 K and 60 K respectively, then reverse Carnot C.O.P is _________

A. 0.5
B. 1
C. 3
D. 2
Answer» C. 3
Discussion
6.

The reverse Carnot cycle C.O.P. can be expressed as _________ (Where t1 is the lower temperature and t2 is the higher temperature).

A. \(\frac{t1-t2}{t2}\)
B. \(\frac{t2-t1}{t2}\)
C. \(\frac{t2-t1}{t1-t2}\)
D. \(\frac{t2-t1}{t1}\)
E. .a) \(\frac{t1-t2}{t2}\) b) \(\frac{t2-t1}{t2}\) c) \(\frac{t2-t1}{t1-t2}\) d) \(\frac{t2-t1}{t1}\)
Answer» E. .a) \(\frac{t1-t2}{t2}\) b) \(\frac{t2-t1}{t2}\) c) \(\frac{t2-t1}{t1-t2}\) d) \(\frac{t2-t1}{t1}\)
Discussion
7.

In a refrigerating machine, if the lower temperature is fixed, then the C.O.P. of machine can be increased by?

A. Increasing the higher temperature
B. Decreasing the higher temperature
C. Operating the machine at lower speed
D. Operating the machine at higher speed
Answer» C. Operating the machine at lower speed
Discussion
8.

The Co-efficient of Performance is always __________

A. greater than 1
B. less than 1
C. equal to 1
D. zero
Answer» B. less than 1
Discussion
9.

Which equation represents efficiency in general?

A. \(\frac{Work \,Done}{Refrigeration \,effect}\)
B. \(\frac{Heat \,Trasfer}{Work \,Done}\)
C. \(\frac{Work\, Done}{Heat \,Transfer}\)
D. \(\frac{Refrigeration \,effect}{Work \,Done}\)
Answer» D. \(\frac{Refrigeration \,effect}{Work \,Done}\)
Discussion
10.

Find the C.O.P. of a refrigeration system if the work input is 30 KJ/kg and refrigeration effect produced is 120 KJ/kg of refrigerant flowing.

A. 3
B. 4.00
C. 0.75
D. 0.25
Answer» C. 0.75
Discussion
11.

Find the Relative C.O.P. of a refrigeration system if the work input is 60 KJ/kg and refrigeration effect produced is 130 KJ/kg of refrigerant flowing. Also Theoretical C.O.P. is 3.

A. 0.65
B. 0.79
C. 0.72
D. 0.89
Answer» D. 0.89
Discussion
12.

Find the C.O.P. of a refrigeration system if the work input is 40 KJ/kg and refrigeration effect produced is 130 KJ/kg of refrigerant flowing.

A. 3
B. 2.25
C. 3.75
D. 3.25
Answer» E.
Discussion
13.

What is the term relative C.O.P. referred in terms of refrigeration?

A. \(\frac{Actual \,C.O.P.}{Theoretical \,C.O.P.}\)
B. \(\frac{Theoretical \,C.O.P.}{Actual \,C.O.P.}\)
C. \(\frac{Actual \,C.O.P.}{Average \,C.O.P.}\)
D. \(\frac{Average \,C.O.P.}{Theoretical \,C.O.P.}\)
Answer» B. \(\frac{Theoretical \,C.O.P.}{Actual \,C.O.P.}\)
Discussion
14.

C.O.P. can be expressed by which equation?

A. \(\frac{Work \,Done}{Refrigeration \,effect}\)
B. \(\frac{Refrigeration \,effect}{Work \,Done}\)
C. \(\frac{Work\, Done}{Heat \,Transfer}\)
D. \(\frac{Heat \,Transfer}{Work \,Done}\)
Answer» C. \(\frac{Work\, Done}{Heat \,Transfer}\)
Discussion
15.

What is the term C.O.P. referred in terms of refrigeration?

A. Capacity of Performance
B. Co-efficient of Plant
C. Co-efficient of Performance
D. Cooling for Performance
Answer» D. Cooling for Performance
Discussion