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Heat Transfer

Heat Transfer
A black body does not __________ radiation.

Refract
Absorb or emit
Reflect
Both B & C

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Heat Transfer
The actual temperature drop across the heating surface of an evaporator depends on the

All of these
Pressure difference between the steam chest and the vapor space above the boiling liquid
Solution being evaporated
Liquid depth over the heating surface

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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
None of the listed here
(ΔT)1/4

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Heat Transfer
The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is

Stanton number
Sherwood number
Nusselt number
Schmidt number

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Heat Transfer
In SI units, fouling factor is expressed in

m°K/W
m²°K/W
W/m²°K
m²°K

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Heat Transfer
The value of Stefan-Boltazman constant in SI unit is

0.1714 x 10-8kcal/m². °K4
5.6697 x 10-8kcal/m² . °K4
0.1714 x 10-8W/m².°K4
5.6697 x 10-8W/m².°K4

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