Answer: Zero.
- A Maximum
- B Minimum
- C Zero
- D Equal to heat added
Correct answer: C. Zero
Explanation: W = P delta V. At constant volume, delta V = 0, so W = 0. All heat added goes to internal energy.
The Carnot cycle alternates two isothermal steps (heat absorbed at TH, released at TC) with two adiabatic steps (no heat exchange); the enclosed loop area equals the net work output, and η = 1−TC/TH is the maximum possible efficiency between those two temperatures.
Concept context
Laws of thermodynamics, heat engines, entropy, and gas processes.