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Heat Transfer

Heat Transfer
Reynold's analogy states that

Nst α NRe
NRe α f
Nst α f
NNu α f

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Heat Transfer
Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone.

transition
None of the listed here
highly turbulent
laminar

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Heat Transfer
Pick out the correct equation.

JH = (St)(Pr)2/3 = f/2
JH = (St)1/3(Pr) = f/2
JH = (St)(Pr)1/3 = f/2
JH = (St)2/3(Pr) = f/2

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Heat Transfer
Maximum heat transfer rate is achieved in __________ flow.

Counter-current
Co-current
Turbulent
Laminar

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Heat Transfer
Heat waves

Both B and C
Can not pass through vacuum
Can be reflected by a mirror
Travel in straight line

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Heat Transfer
The thickness of condensate layer in filmwise condensation depends on the

Liquid flow rate from the surface
Condensation rate
All of these
Surface configuration

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