When a system is in equilibrium for all possible processes, the differential or finite change of entropy is__________________?

A. Two isothermal and two isentropic
B. Two isobaric and two isothermal
C. Two isochoric and two isobaric
D. Two isothermals and two isochoric

A. Two temperatures only
B. Pressure of working fluid
C. Mass of the working fluid
D. Mass and pressure both of the working fluid

A. 12 P1V1
B. 6 P1 V1
C. 3 P1V1
D. P1 V1

A. Decreases
B. Increases
C. Remain same
D. May increase or decrease; depends on the nature of the gas

A. n = y = 1.4
B. n = 0
C. n = 1
D. n = 1.66

A. Water
B. Air
C. Evaporative
D. Gas