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Heat Transfer

Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Scaling
Salty
Highly viscous
Corrosive

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Heat Transfer
The equation, Nst = f/2, is the __________ analogy.

Prandtl
Reynolds
None of these
Colburn

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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)

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

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Heat Transfer
In which mode of heat transfer, the Biot number is important?

Transient heat conduction
Radiation
Natural convection
Forced convection

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Heat Transfer
What is the emissivity of a black body?

1
0.5
0.9

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Heat Transfer
In a forward feed multiple effect evaporator, the pressure is

Lowest in last effect
Dependent on the number of effects
Highest in last effect
Same in all effects

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