"A heat engine is a device"

Heat engine is a device used to convert .............energy into...............energy.

A heat engine is 20% efficient. If the engine does 500 J of work every second, how much heat does the engine exhaust every second ?

Efficiency of heat engine is defined as the

Heat engine is a mechanical device which converts heat into ________. [Fill in the blank]

The efficiency of the reversible heat engine is eta_(r) and that of irreversible heat engine is eta_(l) . Which of the following relations is correct?

Distinguish between a heat engine and a refrigerator?

Is it theoretically possible to device a heat engine which will create no thermal pollution ?

Describe heat engine. Define efficieny of heat engine. Mention two reasons for which the efficiency of a heat engine becomes low.