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Heat Transfer

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

J/M2°K
J/m°K
W/m2°K
W/m°K

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Heat Transfer
For concentrating an aqueous solution of a material like anhydrous Na₂SO₄, whose solubility decreases with rise in temperature, the most suitable evaporator is a __________ evaporator.

Backward feed
Vacuum
None of these
High pressure

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Heat Transfer
Heat produced when a steady state current, I passes through an electrical conductor having resistance, 'R' is

I2R
IR
IR2
None of the listed here

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Heat Transfer
Evaporator tubes are generally

Horizontal
Inclined
Vertical
Random

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Heat Transfer
If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will

Increase by 216
Decrease by 22
Increase by 1.8 times
Remain unchanged

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Heat Transfer
When vaporisation takes place directly at the heating surface, it is called

film boiling
vapour binding
nucleate boiling
all of the listed here

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