Efficiency of a Carnot engine is 75% and work done by the engine is 20 kJ per cycle. Then heat rejected by the engine to the sink is

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3.35 kJ/cycle

2.71 kJ/cycle

6.67 kJ/cycle

5.67 kJ/cycle

answer is C.

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Detailed Solution

WQ1=η⇒Q1=20 kJ0.75=803 kJ∴Heat rejected Q2=Q1-W=803-20 kJ/cycle=6.67 kJ/cycle

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