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Heat Transfer

Heat Transfer
Viscous & heat sensitive liquids are concentrated in __________ evaporators.

Long tube
Agitated film
None of these
Open pan

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Heat Transfer
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area

Remains constant
Passes through a maxima
Decreases
Increases

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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

More space
Less heating surface
None of these
Lower maintenance cost

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Heat Transfer
The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )

(ΔT)2
(ΔT)1/4
None of the listed here
ΔT

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Heat Transfer
In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to __________ the velocity head

square root of
none of the listed here
four times
twice

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Heat Transfer
If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows __________ law.

Parabolic
Linear
Logarithmic
Hyperbolic

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