# Refrigeration Cycles - Mechanical Engineering (MCQ) questions and answers

1)   How is the COP of a refrigerator calculated?

a. [COP]Ref. = Q1 / W
b. [COP]Ref. = Q2 / W
c. [COP]Ref. = W / Q1
d. [COP]Ref. = W / Q2
 Answer  Explanation ANSWER: [COP]Ref. = Q2 / W Explanation: No explanation is available for this question!

2)   Wet compression is ______.

a. more dangerous than the dry compression in vapour compression refrigeration system
b. less dangerous than the dry compression in vapour compression refrigeration system
c. equally preferable in vapour compression refrigeration system
d. cannot say
 Answer  Explanation ANSWER: more dangerous than the dry compression in vapour compression refrigeration system Explanation: No explanation is available for this question!

3)   What is correct formula for calculating COP of heat pump?

a. [COP]H. P. = Q1 / W
b. [COP]H. P. = Q2 / W
c. [COP]H. P. = W / Q1
d. [COP]H. P. = W / Q2
 Answer  Explanation ANSWER: [COP]H. P. = Q1 / W Explanation: No explanation is available for this question!

4)   The gas-refrigeration system is

a. more heavy and bulky than the vapour compression cycle
b. less heavy and bulky than the vapour compression cycle
c. same in construction with the vapour compression cycle
d. none of the above
 Answer  Explanation ANSWER: less heavy and bulky than the vapour compression cycle Explanation: No explanation is available for this question!

5)   How is the COP of gas-refrigeration cycle compared with the COP of vapour compression cycle, for the same capacity?

a. the COP of gas-refrigeration cycle is lower than the COP of vapour compression cycle, for the same capacity
b. the COP of gas-refrigeration cycle is higher than the COP of vapour compression cycle, for the same capacity
c. the COP of gas-refrigeration cycle is same as the COP of vapour compression cycle
d. none of the above
 Answer  Explanation ANSWER: the COP of gas-refrigeration cycle is lower than the COP of vapour compression cycle, for the same capacity Explanation: No explanation is available for this question!

6)   The ideal gas-refrigeration cycle is similar to

a. Brayton cycle
b. Reversed Brayton cycle
c. Rankine cycle
d. Reversed Rankine cycle
 Answer  Explanation ANSWER: Reversed Brayton cycle Explanation: No explanation is available for this question!

7)   How much is the temperature drop of real gas by throttling?

a. vary big temperature drop
b. very small temperature drop
c. no temperature drop
d. cannot say
 Answer  Explanation ANSWER: very small temperature drop Explanation: No explanation is available for this question!

8)   In gas cycle refrigeration system, the throttle valve of a vapour compression refrigerant system is replaced by

a. capillary tube
b. expander
c. reverse throttle valve
d. none of the above
 Answer  Explanation ANSWER: expander Explanation: No explanation is available for this question!

9)   In year-round air conditioning, by reversing refrigerating cycle

a. condenser acts like evaporator
b. evaporator acts like condenser
c. both a. and b.
d. none of the above
 Answer  Explanation ANSWER: both a. and b. Explanation: No explanation is available for this question!

10)   Which of the following is NOT a type of heat pump?

a. vapour compression type
b. vapour absorption type
c. both a. and b.
d. none of the above
 Answer  Explanation ANSWER: none of the above Explanation: No explanation is available for this question!

1 2 3 4 5