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Heat Transfer

Heat Transfer
1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is

500
520
400
200

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Heat Transfer
The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is

Some
Less
More
Either more or less ; depends on the nature of vapor

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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

0.85
0.35
0.55
0.45

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Heat Transfer
Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called

Forced convection
Natural convection
Radiation
Conduction

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Heat Transfer
In a shell and tube heat exchanger, floating head is used for

High heat transfer co-efficient
Less corrosion of tubes
Large temperature differentials
Low pressure drop

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Heat Transfer
A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m².K. The Biot number is

0.0035
3.5
5.6
0.025

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