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Question 31091
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Kinetic Theory and Thermodynamics: Carnot Advanced MCQ

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Carnot AdvancedHardQuestion 31091

Question

Diesel cycle has higher efficiency than Otto at same compression ratio because:
  1. A
    Diesel fuel has higher energy
  2. B
    Diesel cycle's effective compression ratio for expansion is higher
    Correct
  3. C
    Diesel engines are heavier
  4. D
    Diesel runs hotter

Correct answer

Diesel cycle's effective compression ratio for expansion is higher

Explanation

In the Diesel cycle, fuel ignites at constant pressure (isobaric), then the gas expands further adiabatically. The expansion ratio > compression ratio, capturing more work than Otto for same input.

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