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Heat Transfer

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
< 0.1
< 0.5
0.5

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Heat Transfer
Absorptivity and refletivity of a perfect black body are respectively

1 and 0
1 and ?
0 and 0.5
0 and 1

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Heat Transfer
Prandtl and Reynolds analogy are same, when Prandtl number is

0.5
1
1.5
> 2

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Heat Transfer
Presence of a non-condensing gas in a condensing vapour

decreases thermal resistance
increases the rate of condensation
None of the listed here
is desirable to increase the film co-efficient

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

area
none of the listed here
length
volume

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Heat Transfer
A BTU/hr.ft.2 °F is equal to

None of these
1 kcal/hr. m²°C
1 kcal/hr. m².°K
4.88 kcal/hr. m.2°C

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