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Heat Transfer

Heat Transfer
Steam economy in case of a triple effect evaporator will be

> 1
< 1
Between 0 and 1
1

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Heat Transfer
Film condensation is promoted on a/an __________ surface.

dirty
coated
clean & smooth
oily

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Heat Transfer
At what value of Prandtl number, the hydrodynamic and thermal boundary layers are identical?

80
1.5
0.5
1

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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
(ΔT)1/4
None of the listed here

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Heat Transfer
A tank painted with which of the following coloured paints, would heat up maximum by radiation from sun?

Black paint
Grey paint
White paint
Yellow paint

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Heat Transfer
If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will

Decrease by 22
Increase by 216
Remain unchanged
Increase by 1.8 times

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