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Heat Transfer

Heat Transfer
Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is

0.6
0.8
0.2
0.4

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Heat Transfer
For a multipass shell and tube heat exchanger, the LMTD correction factor is always

1
< 1
> 1
Between 1 & 2

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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
1/U₁ - 1/U₂
1/U₂ - 1/U₁
U₁ - U₂

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Heat Transfer
Forced circulation evaporators are normally used for concentrating liquids having

High viscosity
Neither A nor B
Scaling characteristics
Both A & B

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Heat Transfer
The Stefan-Boltzman constant depends on the

Medium
Surface
Temperature
None of these

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Heat Transfer
Choose the correct equation.

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

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