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Heat Transfer

Heat Transfer
For what value of Prandtl number, St = f/2?

1
1.5
> 1
2

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Heat Transfer
Steam side heat transfer co-efficient in an evaporator is in the range of __________ kcal/hr.m²°C.

100-500
18537
1000-1500
5000-15000

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Heat Transfer
Choose the most important factor on which the heat conducted through a wall in a unit time will depend on?

Temperature difference between the two surfaces of the wall
Area of the wall perpendicular to heat flow
Material of the wall
Thickness of the wall

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Heat Transfer
It is not preferable to use superheated steam in evaporators, because of its very

high pressure
none of the listed here
low film co-efficient
high temperature

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Heat Transfer
For specified tube outside diameter, higher BWG means higher

cross-sectional area
none of the listed here
tube thickness
weight per unit length

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Heat Transfer
In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is

Infinity
Same as average heat transfer co-efficient for tube side
Zero
None of these

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