Heat Transfer MCQs

1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m² and the overall heat transfer co-efficient to the liquid is 1500 W/m².°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be

by
15 min
22 min
44 min
51 min
✅ The correct answer is option D.

A process stream of dilute aqueous solution flowing at the rate of10 Kg.s⁻¹ is to be heated. Steam condensate at 95°C is available for heating purpose, also at a rate of 10 Kg.s⁻¹. A 1 – 1 shell and tube heat exchanger is available. The best arrangement is

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Counter flow with process stream on shell side
Counter flow with process stream on tube side
Parallel flow with process stream on shell side
Parallel flow with process stream on tube side
✅ The correct answer is option A.