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Heat Transfer

Heat Transfer
Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)

0.4 D
0.5 D
0.3 D
0.2 D

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Heat Transfer
In a shell and tube heat exchanger, square pitch compared to triangular pitch

Gives a lower shell side pressure drop
Can pack more surface area into a shell of given diameter
None of these
Gives a higher shell side pressure drop

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

None of these
Forward
Parallel
Backward

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Heat Transfer
When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids?

When fluid flows past a smooth surface
None of these
At low velocity
At high fluid velocity

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Heat Transfer
Sensible heat of hot industrial flue gases can not be recovered by a/an

Ceramic recuperator
Regenerator
Economiser
None of these

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Heat Transfer
In an extended surface heat exchanger, fluid having lower co-efficient

Can flow either inside or outside the tubes
Flows through the tube
Flows outside the tubes
Should not be used as it gives very high pressure drop

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