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ISRO Mechanical Engg.: Heat Transfer Quiz 3

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Question 1

An adiabatic heat exchanger is used to heat cold water at 15ºC entering at a rate of 5 kg/s by hot air at 90ºC entering also at rate of 5 kg/s. If the exit temperature of hot air is 20ºC, the exit temperature of cold water is __________. Ca= 1 and Cw=4.2.

Question 2

The variation of temperature inside a wall is shown by three different curves. In which case thermal conductivity least varies with temperature.

Question 3

A sphere, a cube and a disc all of the same material, quality and volume are heated to 900 K and left in air. Which of these will have the lowest rate of cooling

Question 4

When the temperature of a solid surface changes from 227 ºC to 1227 ºC, its total emissive power changes from E1 to E2. The ratio will be _________.

Question 5

A flat plate of length 1 m and width 50 cm is placed in an air stream at 30 °C blowing parallel to it. The convective heat transfer coefficient is 30 W/(m2K). The heat transfer if the plate is maintained at a temperature of 400 °C is
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