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HEAT TRANSFER

Heat Transfer
Water is normally used as a coolant in the heat exchange equipments mainly because ofits

High fluidity
Low density
Low viscosity
Abundance & high heat capacity

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Heat Transfer
The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

1200W/m².K
894W/m².K
287 W/m².K
333W/m².K

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Heat Transfer
Forced circulation evaporators are normally used for concentrating liquids having

Scaling characteristics
Neither A nor B
High viscosity
Both A & B

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Heat Transfer
A __________ evaporator employs an annular downtake.

Long tube vertical
None of these
Basket type
Horizontal

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Heat Transfer
During crystallisation, formation of crystal can occur in __________ solution only.

Supersaturated
Undersaturated
All of these
Saturated

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