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Heat Transfer

Heat Transfer
Removal of __________ heat is involved in the condensation of a vapor under saturated conditions.

Both B & C
Sensible
Latent
Super

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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
U₂ - U₁
U₁ - U₂
1/U₂ - 1/U₁

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Heat Transfer
The thickness of condensate layer in filmwise condensation depends on the

Liquid flow rate from the surface
Condensation rate
All of these
Surface configuration

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Heat Transfer
With the increase of temperature, the Col-burn jH factor

Increases
May increase or decrease ; depending on temperature
Remains unchanged
Decreases

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Heat Transfer
Which of the following has the lowest overall heat transfer co-efficient?

Air
Water
Molten sodium
Dowtherm

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Heat Transfer
An insulator should have

Low thermal conductivity
Less resistance to heat flow
A porous structure
High thermal conductivity

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