Assertion : The efficiency of a heat engine can never be unity.
Reason : Efficiency of heat engine is fundamental limitation given by first law of thermodynamics.

Efficiency of a Carnot heat engine may be given as

Assertion: Efficiency of a heat engine can't be greater than efficiency of Carnot engine. Reason: Effieciency of any engine is never 100%

The maxium possible efficiency of a heat engine is

Assertion : Efficiency of a Carnot engine increase on reducing the temperature of sink. Reason : The efficiency of a Carnot engine is defined as ratio of net mechanical work done per cycle by the gas to the amount of heat energy absorbed per cycle from the source.

A : Efficiency of heat engine can neve be 100%. R : Second law of thermodynamics puts a limitaion of the efficiency of a heat engine.

Relationship between efficiency of heat engines and coefficient of performance.

What would be the efficiency of the heat engine diagramed as shown below?

What percentage T_(1) is of T_(2) for a 10% efficiency of a heat engine?

The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is

The relation between efficiency 'eta' of a heat engine and the co-efficient of performance 'alpha of a refrigerator is