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Heat Transfer

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

Scaling
Corrosive
Highly viscous
Salty

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Heat Transfer
With increase in temperature, the total emissivity of conductors

Decreases linearly
Decreases
Remains same
Increases

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Heat Transfer
A dephlegmator is a

Double pipe heat exchanger
Total condenser
Vacuum evaporator
Partial condenser

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Heat Transfer
Shell side pressure drop in a shell and tube heat exchanger does not depend upon the

Tube diameter & pitch
Baffle spacing & shell diameter
None of these
Viscosity, density & mass velocity of shell side fluid

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Heat Transfer
The critical radius 'r' of insulation on a pipe is given by

r = h/k
r = k/h
r = k/2h
r = 2k/h

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Heat Transfer
Heat transfer in the laminar sublayer in case of a liquid flowing through a pipe, is mostly by

Convection
Conduction
None of these
Eddies current

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