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Heat Transfer

Heat Transfer
At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe?

< 0.5
< 0.1
0.5
> 0.6

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Heat Transfer
The separation of liquid droplets from the vapor is done by a/an __________ , in the evaporators.

Steam ejector
Entrainment separator
Vacuum pump
Compressor

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Heat Transfer
The absorptivity of a body is equal to its emissivity

under thermal equilibrium
none of the listed here
at a particular temperature
for circular bodies

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Heat Transfer
Reynold's analogy states that (where, St = Stanton number f = friction factor)

St = 4f
St = f1/2
St = f/4
St = f/2

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Heat Transfer
The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K₀ + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be

W/m
None, A is just a number
W/m.k
W/m.k²

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Heat Transfer
A concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires

More space
Lower maintenance cost
Less heating surface
None of these

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