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GATE 2025 PI – Question 28

General Engineering · Thermal and Fluids Engineering · 1 mark · Multiple choice

Heat addition in an ideal Diesel cycle is ______.

  1. isobaric
  2. isothermal
  3. isochoric
  4. isentropic

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Correct answer: (A) isobaric

Explanation

The ideal Diesel cycle adds heat while the piston moves at constant pressure. This is **isobaric, A**. Compression and expansion are isentropic; heat rejection is at constant volume.

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