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Heat Transfer

Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Corrosive
Salty
Scaling
Highly viscous

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Heat Transfer
The advantage of using a 1 - 2 shell and tube heat exchanger over a 1 - 1 shell and tube heat exchanger is

Lower tube side pressure drop
Higher tube side heat transfer co-efficient
Higher shell side heat transfer co-efficient
Lower shell side pressure drop

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Heat Transfer
Which is the most suitable for the concentration of foamy & frothy liquors?

Agitated film evaporator
Long tube vertical evaporator
Open pan evaporator
None of these

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Heat Transfer
Heat transfer by __________ may not necessarily require the presence of a medium

natural convection
radiation
none of the listed here
coduction

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Heat Transfer
Nusselt number is the ratio of the temperature gradient at the wall to

That across the entire pipe
Heat flux
Temperature difference
None of these

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Heat Transfer
The critical radius of insulation for cylindrical pipe is (where, hi = heat transfer coefficient at inside of the pipe )

2K/h0
hi/K
K/h0
2hi/K

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