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Heat Transfer

Heat Transfer
Which has the lowest Prandtl number?

Water
Lube oil
Liquid metal
Aqueous solution

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Heat Transfer
In natural convection heat transfer, the correlating parameter is the

Grashoff number
Eckert number
Bond number
Graetz number

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

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

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Heat Transfer
Which of the following has the minimum absorptivity?

Iron plates
Refractory bricks
Coal dust
Aluminium foil

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Heat Transfer
For evaporation of viscous solution in a multiple effect evaporator, the prefered feeding scheme is

Backward
Forward
Parallel
None of these

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Heat Transfer
Reynold's analogy states that (where, St = Stanton number f = friction factor)

St = 4f
St = f/2
St = f1/2
St = f/4

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