Question

What is heat engine obtain its expression for its efficiency

Answer 1

Answer:

A heat engine is a device which converts heat energy into mechanical energy.

Explanation:

Efficiency of a heat engine is the ratio of useful , work done (w) by the engine per cycle to the heat energy absorbed from the source (Q1) per cycle.

n = w/Q1 = 1 - Q1/Q2

where , Q2 is the heat energy rejected to the sink.