Question

If the temperature of a source increases, the efficiency of a heat engine :

• A. increases
• B. decreases
• C. remains unchanged
• D. none of these

Answer 1

The correct option is A increases

For a Carnot cycle efficiency is given by
$\eta =1-\frac{T_1}{T_2}$
where $T_1$ is the temperature of the sink and $T_2$ is that of source.
Therefore, if we increase the temperature of source, its efficiency will increase.