Question

The efficiency of the Carnot heat engine :

• A. is independent of the temperature of the source and the sink
• B. is independent of the working substance
• C. can be 100%
• D. is not affected by the thermal capacity of the source or the sink

Answer 1

The correct option is B is independent of the working substance

Efficiency of Carnot engine is given by $\eta =1-\frac{T_1}{T_2}$, where $T_2$ is temperature of source and $T_1$ is temperature of sink.

Hence, we see that efficiency depend on the temperature of sink and source only and not on the substance.