Heat Transfer
In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient

Decreases
Increases
May increase or decrease; depends on the feed
Is not affected

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Heat Transfer
Nusselt number is the ratio of the

Temperature difference to the temperature gradient at the wall
Temperature gradient of the wall to that across the entire pipe
None of these
Heat flux at the wall to that across the entire pipe

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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
Presence of a non-condensible gas decreases the condensing film co-efficient
All of these

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