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Heat Transfer

Heat Transfer
For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.

Extremely low
No
High
Low

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Heat Transfer
In a forward feed multiple effect, the pressure build up will be

highest at the outlet of the last effect
least at the inlet of the first effect
highest at the inlet of the last effect
least at the outlet of the last effect

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Heat Transfer
The critical radius of insulation for a spherical shell is (where, K = thermal conductivity of insulating material h0 = heat transfer coefficient at the outer surface)

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

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Heat Transfer
Double pipe heat exchangers are used

because it is less costly
because it occupies less floor area
when heat transfer area required is very low
when heat transfer area required is very high

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Heat Transfer
For evaporation of viscous solution in a multiple effect evaporator, the prefered feeding scheme is

Backward
None of these
Parallel
Forward

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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

520
200
400
500

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MORE MCQ ON Heat Transfer

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