Question

For a reversible process, necessary condition is

• A. that, in the whole cycle of the system, the loss of any type of heat energy should be zero
• B. that the process should be too fast
• C. that the process should be slow so that the working substance should remain in thermal and mechanical equilibrium with the surroundings.
• D. that the loss of energy should be zero and it should be quasistatic

Answer 1

Answer: (D)

Quasistatic takes care of the thermal, mechanical and chemical equilibrium (thermodynamic equilibria). No dissipative forces like friction, viscosity or electrical resistance etc. must be there which create a loss of energy.