GATE AG 2025 • Q28 MSQ • 1 Mark

Section 3: Farm Power

Farm Power

Subtopic: Fuels and combustion

Question Statement:

Which method(s) is/are generally used in spark ignition engines for evaluating volatility?

Options:

  • (A) Distillation test
  • (B) Motor method
  • (C) Pensky Martens closed tester
  • (D) Reid vapor pressure test

Official Answer Key:

A, D

Step-by-Step Solution & Explanation

Distillation (ASTM D86) and Reid Vapor Pressure tests directly characterize gasoline volatility. The Motor method (with Research method) evaluates octane rating, not volatility. Pensky-Martens closed cup measures flash point, primarily used for diesel/less-volatile fuels — not for SI engine fuel volatility.

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