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Heat Transfer

Heat Transfer
1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is

200
520
400
500

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Heat Transfer
Heat sensitive materials can be concentrated in an evaporator employing

Vacuum
None of these
High residence time
High pressure

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Heat Transfer
Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid

for fluids in tubulent flow
none of the listed here
for fluids in laminar flow
when Grashhoff number is very important

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

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

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Heat Transfer
Boiling point elevation of a solution of NaOH

Both B and C
Increases rapidly with temperature rise
Is almost independent of temperature
Is almost independent of pressure

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Heat Transfer
In case of a vertical tube evaporator, with increase in the liquor level, the __________ is increased.

Velocity of circulation
Neither A and B
Both A and B
Liquor-film co-efficient

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