MCQs
Total Questions : 2525
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Question 1. The thermal efficiency of a reversible heat engine operating between two given thermal reservoirs is 0.4. The device is used either as a refrigerator or as a heat pump between the same reservoirs. Then the coefficient of performance as a refrigerator (COP)R and the co-efficient of performance as a heat pump (COP)HP are
Answer: Option C. -> (COP)R = 1.5; (COP)HP = 2.5
Answer: Option A. -> Infinity
Answer: Option B. -> Sum of all resistances
Answer: Option A. -> 1
Answer: Option B. -> Between two bodies not in physical contact with each other
Answer: Option C. -> In case of a 1 - 2 shell and tube heat exchanger, the LMTD correction factor value increases sharply, when a temperature cross occurs
Answer: Option C. -> Same for all wavelengths
Answer: Option C. -> Wien's
Answer: Option D. -> None of these
Answer: Option A. -> Black