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Heat Transfer

Heat Transfer
Duhring rule is important in solving problems on

Crystallisation
Humidification
Evaporation
Distillation

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Heat Transfer
In forced convection, the heat transfer depends on

Re, Gr
mainly Gr
none of the listed here
Re, Pr

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Heat Transfer
What is the emissivity of a black body?

0.9
0.5
1

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Heat Transfer
Nusselt number for full developed, laminar, constant property flow in a pipe at uniform heat flux is

0.72
83
18
4.364

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Heat Transfer
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C.

None of these
1
4.88
1.49

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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
h0/K
2K/h0

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