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Heat Transfer

Heat Transfer
The ratio of momentum diffusivity to thermal diffusivity is the __________ number.

Nusselt
Stanton
Grashoff
Prandtl

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Heat Transfer
If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface tempeature follows __________ law.

Hyperbolic
Linear
Parabolic
Logarithmic

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Heat Transfer
Circulation pump is located below the evaporater to

Avoid cavitation
Create more suction head
None of these
Avoid frequent priming

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Heat Transfer
The value of Stefan-Boltazman constant in SI unit is

0.1714 x 10-8W/m².°K4
5.6697 x 10-8kcal/m² . °K4
5.6697 x 10-8W/m².°K4
0.1714 x 10-8kcal/m². °K4

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Heat Transfer
Planck's distribution law is valid for __________ bodies

white
all of the listed here
black
coloured

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Heat Transfer
What is the unit of thermal conductivity ?

Kcal/hr. m² °C
Kcal/hr.m
Kcal/hr. °C
Kcal/hr.m.°C

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