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Heat Transfer

Heat Transfer
(NRe.NPr)(D/L) is called the __________ number

None of these
Stanton
Graetz
Peclet

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Heat Transfer
With the increase of temperature, the Col-burn jH factor

Increases
Remains unchanged
Decreases
May increase or decrease ; depending on temperature

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Heat Transfer
A perfect black body is a perfect __________ of radiation

none of the listed here
emitter
absorber
Both emitter & absorber

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Heat Transfer
A concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires

Lower maintenance cost
None of these
More space
Less heating surface

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Heat Transfer
The thickness of condensate layer in filmwise condensation depends on the

All of these
Condensation rate
Surface configuration
Liquid flow rate from the surface

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Heat Transfer
Thermal conductivity of a gas at low density, __________ with increase in temperature.

Increases
Decreases
May increase or decrease; depends on the gas
Remains unchanged

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