The GATE Grind

GATE 2025 AG – Question 28

Farm Power · Farm Power · 1 mark · Multiple select

Which methods evaluate fuel volatility for spark-ignition engines? Select all that apply.

  1. Distillation test
  2. Motor method
  3. Pensky–Martens closed tester
  4. Reid vapor-pressure test

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Show answer and explanation

Correct answer: (A) Distillation test; (D) Reid vapor-pressure test

Explanation

The distillation curve measures the temperature range over which fuel fractions vaporize, and Reid vapor pressure measures a standardized vapor pressure. Both characterize volatility. The motor method measures octane/knock performance, and Pensky–Martens measures flash point. Select **A, D**.

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