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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

400
500
520
200

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Heat Transfer
The heat transfer co-efficient in film type condensation is __________ that for dropwise condensation.

Is same as
Lower than
Greater than
Half

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Heat Transfer
Vibrations in the tubes of a shell and tube heat exchanger is induced due to the

All of these
Vibrations transmitted through piping and/or supports due to external reasons
Oscillations in the flow of shell/tube sides fluid
Flow of fluid on the tube and shell sides

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Heat Transfer
For hot feed, forward feeding as compared to backward feeding results in __________ economy.

No effect on
Decreased
None of these
Increased

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Heat Transfer
Prandtl and Reynold's analogies are identical for Prandtl number value of

5
1
0.5

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Heat Transfer
What is the emissivity of a black body?

1
0.9
0.5

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