Air enters a compressor insulated against heat transfer at $37$ temperature and $105$kPa pressure and $610$ kPa pressure and

It comes out at $287.$ Neglecting the kinetic and potential energy change and at the same time determining the specific heats

Considering that it changes with temperature;

a$)$ Isentropic efficiency of the compressor,

b$)$ Find the exit temperature of the air if the compression is reversible.EeeJJb