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Heat Transfer

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

Colburn
Reynolds
None of these
Prandtl

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Heat Transfer
In a backward feed multiple effect evaporator

None of these
Feed is introduced in the first effect
No pumps are required between successive effects
Feed flows from low pressure to high pressure

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Heat Transfer
The advantage of using a 1 - 2 shell and tube heat exchanger over a 1 - 1 shell and tube heat exchanger is

Lower shell side pressure drop
Higher shell side heat transfer co-efficient
Lower tube side pressure drop
Higher tube side heat transfer co-efficient

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Heat Transfer
Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by

None of these
Keeping the heat transfer surface clean
Increasing the tube length
Enhancing the fluid pumping rate

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Heat Transfer
Vent pipes are provided in a condenser to

Facilitate easy cleaning of tubes
Purge the condenser
Remove non-condensable gases
None of these

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Heat Transfer
The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the

Solution has an elevation of boiling point
Evaporators opreate at atmospheric pressure
None of these
Evaporators operate under vacuum

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