Question Bank • QB_FP_ADV_025 MCQ • 1 Mark

Section 3: Farm Power

Farm Power

Subtopic: Fuels and combustion

Question Statement:

The ignition quality of a diesel fuel that characterizes its resistance to diesel knock (ignition delay duration) is measured by its:

Options:

  • (A) Octane number
  • (B) Cetane number
  • (C) Reid vapour pressure
  • (D) Aniline point

Answer Key:

B

Step-by-Step Solution & Explanation

- **Cetane Number:** Cetane rating measures the ignition delay period of a compression ignition fuel. - A higher cetane number denotes a shorter ignition delay, smoother pressure rise, and easy cold starting. - High-speed tractor diesel engines require a minimum cetane number of $45\text{--}50$.
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