#### The temperature­- entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is Option 1) Option 2) Option 3) Option 4)

As we learnt in

Entropy -

It is a measure of disorder of molecular motion of a system.

- wherein

Greater is disorder greater is entropy

and

Efficiency of a cyclic process -

- wherein

Gross heat implied only part of heat absorbed.

The efficiency of cycle is:

Efficiency

Option 1)

This option is correct.

Option 2)

This option is incorrect.

Option 3)

This option is incorrect.

Option 4)

This option is incorrect.