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Heat Transfer

Heat Transfer
(Cp . μ)/K is termed as the __________ number.

Prandtl
Nusselt
Grashoff
Stanton

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Heat Transfer
Presence of a non-condensing gas in a condensing vapour

None of the listed here
increases the rate of condensation
decreases thermal resistance
is desirable to increase the film co-efficient

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Heat Transfer
The thermal boundary layer at NPr > 1

Is thicker than hydrodynamic boundary layer
Is thinner than hydrodynamic boundary layer
Disappears
And the hydrodynamic boundary layer are identical

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Heat Transfer
jH factor for heat transfer depends upon the __________ number.

Biot
Prandtl
Reynolds
Nusselt

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Heat Transfer
The critical radius 'r' of insulation on a pipe is given by

r = k/h
r = k/2h
r = h/k
r = 2k/h

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Heat Transfer
An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is

3000
4000
9000
4600

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