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Heat Transfer

Heat Transfer
Absorptivity and refletivity of a perfect black body are respectively

1 and 0
0 and 0.5
0 and 1
1 and ?

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Heat Transfer
Economy of a multiple effect evaporator depends upon the

Neither A nor B
Rate of heat transfer
Heat balance consideration
Both A and B

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Heat Transfer
A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides

Higher economy
Lower capacity
Both A & B
Lower economy

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Heat Transfer
The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by

Painting the surface black
Painting the surface white (with aluminium paint)
Giving the surface a mirror finish
Roughening the surface

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Heat Transfer
Choose the correct equation.

Nu = (Re) (Pr) (Gz)
Nu = (Pr)(St)
Nu = (Re)(Pr)
Nu = (Re) (Pr) (St)

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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)1/4
None of the listed here
ΔT
(ΔT)2

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