Q 11-11-030NEETJEE MainMedium
An engine absorbs $1000$ J of heat from a source at $500$ K in each cycle and rejects heat to a sink at $300$ K. The maximum work it can do per cycle is
Answer: (A) $400$ J
Concept. The best possible engine is a Carnot engine.
Step 1. Efficiency. $1 - \dfrac{300}{500} = 0.4$.
Step 2. Work. $0.4 \times 1000 = 400$ J.
Answer. $400$ J (Option A).
Solution by Sreeraj P, M.Sc Physics