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Heat Transfer

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

0.72
83
4.364
18

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Heat Transfer
Fourier's law of heat conduction applies to __________ surfaces.

Both A and B
Non-isothermal
Isothermal
Neither A and B

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Heat Transfer
For a given ambient air temperature with increase in the thickness of insulation of a hot cylinderical pipe, the rate of heat loss from the surface would

Increase
Decrease
First decrease and then increase
First increase and then decrease

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Heat Transfer
The actual temperature drop across the heating surface of an evaporator depends on the

Liquid depth over the heating surface
Pressure difference between the steam chest and the vapor space above the boiling liquid
Solution being evaporated
All of these

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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
The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is

2
43834
43832
4

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