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GATE Prev Year : Heat Transfer Test-4
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Question 1
Heat transfer through radiation takes place in form of:
Question 2
For an opaque surface, the absorptivity(α), transmissivity(τ), and reflectivity(ρ) are related by the equation
Question 3
Which law is used in calculation in black and grey heat transfer?
Question 4
The object shape is affected in heat transfer by:
Question 5
A cylindrical uranium fuel rod of radius 5 mm in a nuclear reactor is generating heat at the rate of 4 × 107 W/m3 the rod is cooled by a liquid (convective heat transfer coefficient 1000 W/m2-K) at 25 °C. At steady state, the surface temperature (in K) of the rod is
Question 6
The total emissive power of a surface is 500 W/m2 at a temperature T1 and 1200 W/m2 at a temperature T2, where the temperatures are in Kelvin Assuming the emissivity of the surface to be constant, the ratio of the temperatures is
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