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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

520
200
400
500

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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)

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

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Heat Transfer
Heat exchangers operating, when the asymptotic range is reached,

Provide very large heat transfer co-efficient
Results in abruptly increased velocity
Results in making part of the heating surface inactive
None of these

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Heat Transfer
Evaporator tubes are generally

Vertical
Random
Horizontal
Inclined

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Heat Transfer
Stefan-Boltzman law applies to __________ body

black
white
grey
None of the listed here

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Heat Transfer
Prandtl and Reynolds analogy are same, when Prandtl number is

> 2
1.5
0.5
1

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