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Heat Transfer

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

Salty
Corrosive
Scaling
Highly viscous

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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
U₂ - U₁
1/U₂ - 1/U₁
1/U₁ - 1/U₂

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Heat Transfer
The Fourier number (defined as a.t/L²) is used in the analysis of problem involving heat transfer by

Transient conduction
Forced convection
Steady state conduction
Natural convection

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Heat Transfer
A BTU/hr.ft.2 °F is equal to

1 kcal/hr. m²°C
None of these
4.88 kcal/hr. m.2°C
1 kcal/hr. m².°K

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Heat Transfer
With increase in temperature, the thermal conductivity of most liquids

Decreases
First increases upto a certain temperature and then becomes constant
Increases
Remains same

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Heat Transfer
Heat transfer co-efficient (h1) for liquids increases with

None of these
Increasing temperature
Decreasing temperature
Decreasing Reynolds number

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MORE MCQ ON Heat Transfer

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