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Heat Transfer

Heat Transfer
In a boiling curve, the peak heat flux is called the __________ point.

Nusselt
Boiling
Burnout
Leidenfrost

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Heat Transfer
Unsteady state heat conduction occurs, when

Temperature distribution is dependent on time
Heat flows in one direction only
Temperature distribution is independent of time
Three dimensional heat flow is concerned

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Heat Transfer
Value of Nusselt number [Nu = (hD/k)] for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is

100
2
10
0.5

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Heat Transfer
Dietus-Boelter equation cannot be used for molten metals mainly due to its very low

Grashoff number
Prandtl number
viscosity
thermal conductivity

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Heat Transfer
At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe?

> 0.6
0.5
< 0.5
< 0.1

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Heat Transfer
In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass __________ through the heat exchanger.

Thrice
Four times
Once
Twice

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