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Heat Transfer

Heat Transfer
(NRe.NPr)(D/L) is called the __________ number

Stanton
None of these
Graetz
Peclet

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Heat Transfer
At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical?

< 1
1
> 1
None of these

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Heat Transfer
Dropwise condensation occurs on __________ surfaces

smooth clean
polished
contaminated cooling
clean and dirt free

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Heat Transfer
Heat waves

Can not pass through vacuum
Can be reflected by a mirror
Travel in straight line
Both B and C

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Heat Transfer
Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade?

81.25
43.75
48.25
35.5

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Heat Transfer
Heat flux is the time rate of heat transfer per unit

none of the listed here
area
volume
length

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