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Heat Transfer

Heat Transfer
Reynold's analogy states that

NNu α f
Nst α f
NRe α f
Nst α NRe

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Heat Transfer
Heat transfer co-efficient (h1) for liquids increases with

Increasing temperature
Decreasing Reynolds number
Decreasing temperature
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.

Logarithmic
Parabolic
Hyperbolic
Linear

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Heat Transfer
Dropwise condensation is promoted on a/an __________ surface.

Oily
Glazed
Coated
Smooth

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Heat Transfer
Black liquor generated during paper manufacture is concentrated in a

single effect evaporator
single effect evaporator followed by a crystalliser
multiple effect evaporator
multiple effect evaporators followed by a crystalliser

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Heat Transfer
Which of the following has the lowest Prandtl number?

Water
Molten sodium (a coolant used in fast breeder reactor)
Transformer oil
Dilute H₂SO₄

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