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Heat Transfer

Heat Transfer
Stefan-Boltzman law applies to __________ body

black
white
grey
None of the listed here

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Heat Transfer
In Biot number, the characteristic length used is the ratio of the __________ of the solid.

Perimeter to surface area
Volume to surface area
Surface area to perimeter
Surface area to volume

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Heat Transfer
In a shell and tube heat exchanger, floating head is used for

Less corrosion of tubes
Low pressure drop
Large temperature differentials
High heat transfer co-efficient

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Heat Transfer
Nusselt number is the ratio of the temperature gradient at the wall to

None of these
That across the entire pipe
Heat flux
Temperature difference

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Heat Transfer
In SI units, thermal conductivity is expressed in

Watt/m4. °K
Watt/m². °K
Watt/m.°K
Watt/m². °K

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

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