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Mechanical Engineering · Q235

Refrigeration And Air Conditioning

Engineering and GATE · Mechanical Engineering · question 235

Q235

A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be

A.
1.33
B.
2.33
Answer
C.
3.33
D.
4.33

Answer: Option B

Solution

Answer: Option B
Solution:
C.O.P. is reciprocal of efficiency of heat engine.
C.O.P. =
= 3.33 = C.O.P. of heat engine.
Now,
C.O.P. of refrigerator = C.O.P. of heat engine - 1
= 3.33 - 1
= 2.33.
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