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Heat Transfer

Heat Transfer
The unit of heat transfer co-efficient in SI unit is

J/M2°K
W/m2°K
J/m°K
W/m°K

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Heat Transfer
Boiling point of a solution according to Duhring's rule is a linear function of the __________ of water.

Viscosity
Density
Boiling point (at the same pressure)
Thermal conductivity

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

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Heat Transfer
Circulation pump is located below the evaporater to

Create more suction head
Avoid cavitation
None of these
Avoid frequent priming

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Heat Transfer
Heat transfer rate per unit area is called

thermal diffusivity
heat transfer co-efficient
thermal conductivity
heat flux

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Heat Transfer
Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer.

Reynolds
Both A & B
Prandtl & Grashoff
Grashoff

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