Otto cycle on a T–s (temperature–entropy) diagram: choose the correct description Identify the correct schematic description of how the Otto cycle appears on a T–s plot.

Difficulty: Medium

Two vertical (isentropic) lines joined by two constant-volume heat-addition/rejection curves
Two vertical lines joined by two constant-pressure curves
A rectangle bounded by two isotherms and two isobars
A cycle of four isotherms

Correct Answer: Two vertical (isentropic) lines joined by two constant-volume heat-addition/rejection curves

Explanation:

Concept/Approach

Otto cycle: isentropic compression → constant-volume heat addition → isentropic expansion → constant-volume heat rejection.
On a T–s diagram: isentropes are vertical lines; constant-volume processes appear as sloped curves (entropy changes with temperature at v = const).

Final Answer
Two vertical (isentropic) lines joined by two constant-volume heat-addition/rejection curves.

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