Allied & ICAR Exam Bank • ALLIED_0245 MCQ • 1 Mark

Section 3: Farm Power

Farm Power

Subtopic: Power efficiencies and measurement, engine performance curves

Question Statement:

The Willans line method determines engine friction power in diesel engines by:

Options:

  • (A) Extrapolating gross fuel consumption rate versus brake power curve to zero fuel consumption
  • (B) Disconnecting spark plugs sequentially
  • (C) Running at maximum speed with no load
  • (D) Measuring cooling jacket heat alone

Answer Key:

A

Step-by-Step Solution & Explanation

In compression-ignition engines at constant speed, extrapolating the linear fuel consumption line to zero fuel gives negative power equal to friction power.
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