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Heat Transfer

Heat Transfer
Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.

18
7
26
1

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Heat Transfer
In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.

Saturated
Nucleate
Local
Pool

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Heat Transfer
Prandtl and Reynolds analogy are same, when Prandtl number is

0.5
> 2
1
1.5

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Heat Transfer
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area

Passes through a maxima
Increases
Decreases
Remains constant

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Heat Transfer
Dropwise condensation of steam on cooling surface is promoted

Only in presence of air
When both the steam and the tube are clean
An oily surface
None of these

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Heat Transfer
In case of evaporators, liquid entrainment results primarily due to

high heat transfer rate
foaming of the solution
high vacuum in the evaporator
high heat transfer rate

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