Question

if one fourth of the energy added to an engine as heat is removed to the engine's surroundings as heat, what is the efficiency of the engine ​

Answer 1

Explanation:

The useful work done by a heat engine is W = Q1 - Q2 (energy conservation).

An ideal reversible engine does the maximum amount of work.

Any real engine delivers more heat Q2 at the reservoir at T2 than a reversible one and therefore does less useful work.