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Heat Transfer

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

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

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

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

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Heat Transfer
Intermittant tube cleaning is possible to be done in case of a __________ evaporator.

Horizontal tube
None of these
Basket type
Calendria

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Heat Transfer
Reynold's analogy states that (where, St = Stanton number f = friction factor)

St = 4f
St = f/4
St = f/2
St = f1/2

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Heat Transfer
jH factor for heat transfer is not a function of the __________ number.

Reynolds
Nusselt
Grashoff
Both B & C

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Heat Transfer
If heat transfer rate varies with the time, it is termed as

Monochromatic radiation
None of these
Steady state conduction
Forced convection

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