Heat Transfer
The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by __________ times, when the number of tube passes is increased to 8.

40.4
40.8
20.4
20.8

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Heat Transfer
In a gas-liquid shell and tube heat exchanger, the

Gases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes
Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature
All of these
Presence of a non-condensible gas decreases the condensing film co-efficient

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Heat Transfer
A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because

Boiling point elevation in a single effect system is much higher than that in any effect in a multieffect system
Total amount of vapor produced per Kg of feed steam in a multiple effect system is much higher than in a single effect
Heat transfer co-efficient in a single effect is much lower than that in any effect in a multieffect system
Total heat transfer area of all the effects is -less than that in a single effect evaporator system

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