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Heat Transfer

Heat Transfer
Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.)

√d
d2
d1.5
d

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Heat Transfer
A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.

>10
10
Either B or C, depends on the mass of the body

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Heat Transfer
The unit of heat transfer co-efficient in SI unit is

W/m2°K
W/m°K
J/m°K
J/M2°K

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Heat Transfer
Corrosiveness of steam condensate is due to the presence of

Both A & B
Dissolved O₂
CO₂
Neither A nor B

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Heat Transfer
At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe?

< 0.1
> 0.6
< 0.5
0.5

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Heat Transfer
Reynold's analogy states that

Nst α NRe
NNu α f
NRe α f
Nst α f

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