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Heat Transfer

Heat Transfer
Boiling of milk in an open vessel is an example of __________ boiling.

None of these
Film
Saturated nucleate
Sub-cooled

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Heat Transfer
Economy of a multiple effect evaporator depends upon the

Rate of heat transfer
Both A and B
Heat balance consideration
Neither A nor B

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Heat Transfer
Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be

0.55
0.85
0.35
0.45

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Heat Transfer
A 2-4 heat exchanger involves

Only counter-flow of fluids
Only parallel-flow of fluids
Smaller pressure drop compared to 1-2 exchanger
Both counter and parallel-flow of the fluids

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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
> 0.6
< 0.1
< 0.5

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Heat Transfer
According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)

f/4
f
2f
f/2

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