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ISRO Mechanical Exam: Heat Transfer Quiz
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Question 1
The convective heat transfer coefficient h is defined by the relationship (m = mass, 
specific heat, k = conductivity, q = heat flow rate, Nu = Nusselt Number, L = Thickness, 
Temperature difference )
specific heat, k = conductivity, q = heat flow rate, Nu = Nusselt Number, L = Thickness, Temperature difference ) Question 2
A spherical thermocouple junction of diameter 0,706 mm is to be used for the measurement of temperature of a gas stream. The convective heat transfer co-efficient on the bead surface is 400 W/
K, c = 400 j/kg k and p = 8500 kg/
. If the thermocouple initially at 
C, 
the time taken by the bead to reach 
C, is
Question 3
With rise in temperature thermal conductivity of air
Question 4
An air-conditioned room has one of the walls, which is 5m× 3m of 3.75 cm thick brick. The conditioned space is maintained at 27 °C when the outside temperature is 47 °C. Variation of thermal conductivity with temperature of the wall is given by k = 1 + 2 × 10-4T, where T is in degree Kelvin, and k is in W /m °K. The heat gained by the conditioned space through this wall is
Question 5
A grey body is defined such that
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