Allied & ICAR Exam Bank • ALLIED_1114 NAT • 2 Marks

Section 3: Farm Power

Farm Power

Subtopic: Engine Cooling

Question Statement:

A water-cooled tractor engine rejects 25 kW of heat to the cooling water jacket. If water enters the engine block at $75^\circ\text{C}$ and exits at $85^\circ\text{C}$, the required cooling water circulation rate in kg/s is: (Take specific heat of water $c_p = 4.184\text{ kJ/(kg}\cdot\text{K)}$)

Answer Key:

0.598

Step-by-Step Solution & Explanation

$Q = \dot{m} c_p \Delta T \implies 25\text{ kW} = \dot{m} \times 4.184 \times (85 - 75) = \dot{m} \times 41.84 \implies \dot{m} = \frac{25}{41.84} \approx 0.5975\text{ kg/s}$.
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