pressure and temperature

temperature and volume

heat and work

all of these

possible

impossible

easy

none of these

All the reversible engines have the same efficiency.

All the reversible and irreversible engines have the same efficiency.

Irreversible engines have maximum efficiency.

All engines are designed as reversible in order to obtain maximum efficiency.

same

lower

higher

none of these

1/27th

1/93th

1/173th

1/273th