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Heat Transfer

Heat Transfer
Which of the following has maximum thermal conductivity?

Iron
Nitrogen
Tar
Coal

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Heat Transfer
Overall heat transfer co-efficient for cooling of hydrocarbons by water is about

50 -100 Kcal/hr.m².°C
50 -100 W/m² . °K
1000 - 1500 BTU/hr. ft.2°F
50 -100 BTU/hr. ft.2°F

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Heat Transfer
A graph between __________ is called Wilson plot.

1/U Vs . 1/v0.8
V0.8 Vs . U
1/U Vs . 1/V
1/v0.8 Vs . U

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Heat Transfer
Sensible heat of hot industrial flue gases can not be recovered by a/an

Regenerator
Ceramic recuperator
None of these
Economiser

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Heat Transfer
For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)

NPr
NPr1/3
NPr-1
NPr-1/3

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Heat Transfer
A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m².K. The Biot number is

0.0035
5.6
0.025
3.5

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