Thermodynamics ...

For an adiabatic expansion of a perfect gas, the value of $$\dfrac{\bigtriangleup P}{P}$$ is to equal

An engine is supposed to operate between two reservoirs at temperature $$227^{o} C$$. The maximum possible efficiency of such an engine is

Which of the accompanying PV, diagram best represents an isothermal process

The volume of air increases by 5% in its adiabatic expansion. The percentage decrease in its pressure will be

P-V diagram of a diatomic gas is a straight line passing through origin . The molar heat capacity of  the gas in the process will be

An ideal gas expands in such a manner that its pressure and volume can be related by equation $$PV^{2}$$= constant. During this process, the gas is 

Initial pressure and volume of a  gas are P and V respectively. First it is expanded isothermally to volume 4V and then compressed adiabatically to volume V. The final p will be 

Two samples A and B of gas initially at the same pressure and temperature are compressed from volume V to v/2 ( A isothermally and adiabatically.). The final pressure of A is

In the following figure, four curves A, B, C and D are shown. The curves are 

The temperature - entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is