Question Bank • QB_FP_131 NAT • 2 Marks

Section 3: Farm Power

Farm Power

Subtopic: Calculation of power, torque, fuel consumption, heat load and power losses

Question Statement:

In an engine heat balance sheet, total heat supplied by fuel is $120\text{ kW}$. Heat equivalent of brake power is $42\text{ kW}$, heat carried away by cooling water is $36\text{ kW}$, and heat carried away by exhaust gases is $30\text{ kW}$. Calculate the unaccounted heat loss (radiation, convection, unaccounted) in percentage of total heat input.

Answer Key:

10

Step-by-Step Solution & Explanation

Total heat input $Q_{\text{total}} = 120\text{ kW}$. Accounted heat: $Q_{\text{accounted}} = 42 + 36 + 30 = 108\text{ kW}$ Unaccounted losses: $Q_{\text{unaccounted}} = 120 - 108 = 12\text{ kW}$ Percentage unaccounted: $\% = \frac{12}{120} \times 100 = 10.0\%$
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