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Heat Transfer

Heat Transfer
The heat flux in the nucleate boiling regimes is proportional to (where, ΔT = excess temperature)

√(ΔT)
(ΔT)⁴
(ΔT)²
(ΔT)³

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

Stanton
Peclet
Graetz
None of these

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Heat Transfer
What is the absorptivity of a black body?

1
0.78
0.95

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Heat Transfer
Which of the following has the highest thermal conductivity ?

Air
Black
Water
Silver

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Heat Transfer
Duhring rule is important in solving problems on

Humidification
Evaporation
Crystallisation
Distillation

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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.

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

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