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Heat Transfer

Heat Transfer
Reynold's analogy states that

Nst α f
NNu α f
NRe α f
Nst α NRe

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Heat Transfer
In case of a vertical tube evaporator, with increase in the liquor level, the

Both B and C
Capacity of the evaporator is decreased
Capacity of the evaporator is increased
True temperature drop increases

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Heat Transfer
A hot body will radiate heat most rapidly, if its surface is

White & rough
Black & rough
White & polished
Black & polished

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

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

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Heat Transfer
Temperature profile in steady state heat transfer is

parabolic
Linear
hyperbolic
none of the listed here

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Heat Transfer
At what value of Prandtl number, the hydrodynamic and thermal boundary layers are identical?

0.5
1
80
1.5

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