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HEAT TRANSFER

Heat Transfer
Choose the correct equation.

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

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Heat Transfer
Fouling factor for a heat exchanger is given by (where, U₁ = heat transfer co-efficient of dirty surface U₂ = heat transfer co-efficient of clean surface)

U₂ - U₁
U₁ - U₂
1/U₁ - 1/U₂
1/U₂ - 1/U₁

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

Lower economy
Lower capacity
Higher economy
Both A & B

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Heat Transfer
Natural convection is characterised by

Peclet number
Prandtl number
Reynolds number
Grashhoff number

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

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

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