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Heat Transfer

Heat Transfer
In forced convection, the heat transfer depends on

mainly Gr
Re, Pr
none of the listed here
Re, Gr

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

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

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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?

< 0.5
> 0.6
0.5
< 0.1

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Heat Transfer
A black body does not __________ radiation.

Reflect
Absorb or emit
Refract
Both B & C

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Heat Transfer
A diathermaneous substance __________ the thermal radiation completely.

Transmits
Absorbs
Reflects
None of these

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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.

Parabolic
Linear
Hyperbolic
Logarithmic

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