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Heat Transfer

Heat Transfer
For a multipass shell and tube heat exchanger, the LMTD correction factor is always

< 1
Between 1 & 2
1
> 1

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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

0.35
0.45
0.85
0.55

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Heat Transfer
The main purpose of providing fins on heat transfer surface is to increase the

Heat transfer area
Mechanical strength of the equipment
Temperature gradient
Heat transfer co-efficient

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Heat Transfer
_______ paint has the maximum absorption coefficient.

Grey
White
Yellow
Black

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Heat Transfer
Boiling point elevation of an ideal solution

Decreases rapidly with temperature rise
Increases rapidly with temperature rise
Both B and C
In independent of pressure

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Heat Transfer
The purpose of providing expansion bellows in the shell of tubular exchanger is to

Account for the uneven expansion of shell and tube bundles
Facilitate increase of shell length, if needed
Increase the heating load
Impart structural strength

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