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Heat Transfer

Heat Transfer
Reynold's analogy states that

Nst α f
NNu α f
NRe α f
Nst α NRe

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Heat Transfer
With increase in porosity, the thermal conductivity of a solid substance

Decreases
Remains unchanged
May increase or decrease; depends on the solid
Increases

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Heat Transfer
With increase in temperature, the thermal conductivity of non-metallic amorphous solids

None of the listed here
increases
decreases
remains same

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Heat Transfer
A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the __________ number.

Condensation
Brinkman
Grashoff
Stantan

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Heat Transfer
For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally

Increases exponentially
Decreases
Increases
Remains unchanged

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Heat Transfer
The equivalent diameter for pressure drop is __________ that for heat transfer

smaller than
greater than
None of the listed here
equal to

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