Question Bank • QB_EXP_FP_PWR_016 MCQ • 1 Mark

Section 3: Farm Power

Engine Power: Indicated, Brake & Friction Power

Subtopic: Mechanical efficiency

Question Statement:

A tractor diesel engine develops a brake power of $25.0\text{ kW}$ while its frictional power losses are measured as $5.0\text{ kW}$. The mechanical efficiency of the engine is:

Options:

  • (A) $83.3\%$
  • (B) $77.3\%$
  • (C) $88.3\%$
  • (D) $70.8\%$

Answer Key:

A

Step-by-Step Solution & Explanation

Indicated power is the sum of brake power and friction power: $\text{IP} = \text{BP} + \text{FP} = 25.0 + 5.0 = 30.0\text{ kW}$ Mechanical efficiency is given by: $\eta_m = \frac{\text{BP}}{\text{IP}} \times 100 = \frac{25.0}{30.0} \times 100 = 83.3\%$
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