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HEAT TRANSFER

Heat Transfer
In case of a vertical tube evaporator, with increase in the liquor level, the __________ is increased.

Neither A and B
Liquor-film co-efficient
Both A and B
Velocity of circulation

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Heat Transfer
The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by

Painting the surface white (with aluminium paint)
Roughening the surface
Giving the surface a mirror finish
Painting the surface black

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

Reynolds
Colburn
None of these
Prandtl

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Heat Transfer
The equation, (NSt x N2/3Pr) = f/2, is the __________ analogy.

None of these
Reynolds
Colburn
Prandtl

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Heat Transfer
In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass __________ through the heat exchanger.

Four times
Twice
Once
Thrice

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