Explore topic-wise MCQs in Refrigeration.

This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Refrigeration knowledge and support exam preparation. Choose a topic below to get started.

1.

A refrigerator works on a reversed Carnot cycle. The Coefficient of performance is 7. If the capacity of the refrigerator is 12 TR. What is the value of heat rejected from the system?

A. 46 kW
B. 50 kW
C. 42 kJ/min
D. 48 kJ/min
Answer» E.
Discussion
2.

A refrigerator works on a reversed Carnot cycle. The Coefficient of performance is 3.5. If the capacity of the refrigerator is 6 TR. Find out the power required to run the refrigerator.

A. 5 kW
B. 3.5 kW
C. 360 kJ/min
D. 520 kJ/min
Answer» D. 520 kJ/min
Discussion
3.

Two refrigerators M and N operate in series. The refrigerator M absorbs energy at the rate of 1 kW from a body at temperature 400 K and rejects energy as heat to a body at a temperature T. The refrigerator N absorbs the same quantity of energy which is rejected by the refrigerator N from the body at temperature T, and rejects energy as heat to a body at temperature 800 K. If both the refrigerators have the same C.O.P., what is the value temperature T?

A. 600 K
B. 200 K
C. 565.68 K
D. 459.21 K
Answer» D. 459.21 K
Discussion
4.

C.O.P. of the refrigerator is always _____ the C.O.P. of the heat pump when both are working between the same temperature limits.

A. less than
B. greater than
C. equal to
D. inverse of
Answer» B. greater than
Discussion
5.

If the Coefficient of performance of a heat pump is 5, then what is the value of the Coefficient of performance of the refrigerator operating under the same conditions?

A. 4
B. 6
C. 0.2
D. 3
Answer» B. 6
Discussion
6.

A reversed Carnot cycle is operating between temperature limits of 272 K and (+) 49 C. If it acts as a heat engine gives an efficiency of 15.52%. What is the value of C.O.P. of a refrigerator operating under the same conditions?

A. 6.44
B. 0.1838
C. 5.44
D. 2
Answer» D. 2
Discussion
7.

If the reversed Carnot cycle operating as a refrigerator between temperature limits of 405 K and 255 K, then what is the value of C.O.P.?

A. 2.7
B. 0.588
C. 1.7
D. 0.370
Answer» D. 0.370
Discussion
8.

For the systems working on reversed Carnot cycle, what is the relation between C.O.P. of Refrigerator i.e. (C.O.P.)R and Heat Pump i.e. (C.O.P.)P?

A. (C.O.P.)<sub>R</sub> + (C.O.P.)<sub>P</sub> = 1
B. (C.O.P.)<sub>R</sub> = (C.O.P.)<sub>P</sub>
C. (C.O.P.)<sub>R</sub> = (C.O.P.)<sub>P</sub> 1
D. (C.O.P.)<sub>R</sub> + (C.O.P.)<sub>P</sub> + 1 = 0
Answer» D. (C.O.P.)<sub>R</sub> + (C.O.P.)<sub>P</sub> + 1 = 0
Discussion
9.

The C.O.P. of a reversed Carnot refrigerator is 5. What is the ratio of highest temperature to lower temperature?

A. 1.2
B. 0.8
C. 1.2
D. 0.8
Answer» D. 0.8
Discussion
10.

The efficiency of Carnot heat engine is 40%. What is the value of C.O.P. of a refrigerator operating on reversed Carnot cycle?

A. 2.5
B. 1.5
C. 4
D. 10
Answer» C. 4
Discussion
11.

If the condenser and evaporator temperatures are 320 K and 240 K respectively, then what is the value of the C.O.P.?

A. 0.25
B. 4
C. 0.33
D. 3
Answer» E.
Discussion
12.

In a refrigerating machine working on the reversed Carnot cycle, if the lower temperature is fixed, then what can be done to increase the C.O.P.?

A. Increasing higher temperature
B. Operating machine at higher speed
C. Decreasing higher temperature
D. Operating machine at a lower speed
Answer» D. Operating machine at a lower speed
Discussion
13.

If a refrigeration system having T1 and T2 as lower and higher temperatures respectively then, what is the value of C.O.P of the refrigeration system working on the reversed Carnot cycle?

A. T<sub>2</sub> / (T<sub>2</sub> T<sub>1</sub>)
B. (T<sub>2</sub> T<sub>1</sub>) / T<sub>1</sub>
C. (T<sub>2</sub> T<sub>1</sub>) / T<sub>2</sub>
D. T<sub>1</sub> / (T<sub>2</sub> T<sub>1</sub>)
Answer» E.
Discussion