A certain heat engine draws 500 cal/s from a water bath at 27°C and transfers 400 cal/s to a reservoir at a lower temperature.The efficiency of this engine is:
A)80%
B)75%
C)55%
D)25%
E)20%

Question

Quizplus · Accepted Answer

The efficiency of a heat engine is calculated using the formula: Efficiency = (Work output / Heat input) * 100%. The work output is the difference between the heat input and the heat transferred to the lower temperature reservoir. Here, Work output = 500 cal/s - 400 cal/s = 100 cal/s. Therefore, Efficiency = (100 cal/s / 500 cal/s) * 100% = 20%.

A Certain Heat Engine Draws 500 Cal/s from a Water