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HEAT TRANSFER

Heat Transfer
Choose the correct equation.

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

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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)

1/U₂ - 1/U₁
1/U₁ - 1/U₂
U₁ - U₂
U₂ - 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

Higher economy
Lower capacity
Both A & B
Lower economy

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Heat Transfer
Natural convection is characterised by

Peclet number
Grashhoff number
Reynolds number
Prandtl number

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

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

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