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.
Mechanical Engineering
Thermodynamics
Difficulty: Medium
Choose an option
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ATwo vertical (isentropic) lines joined by two constant-volume heat-addition/rejection curves
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BTwo vertical lines joined by two constant-pressure curves
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CA rectangle bounded by two isotherms and two isobars
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DA cycle of four isotherms
Answer
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 AnswerTwo vertical (isentropic) lines joined by two constant-volume heat-addition/rejection curves.