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Heat Transfer

Heat Transfer
The unit of conductance in SI unit is

W/°K
W/m°K
W/m
W/m²

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Heat Transfer
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area

Passes through a maxima
Increases
Remains constant
Decreases

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Heat Transfer
Nusselt number for full developed, laminar, constant property flow in a pipe at uniform heat flux is

83
0.72
18
4.364

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Heat Transfer
Pick out the correct equation.

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

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Heat Transfer
LMTD can't be used as such without a correction factor for the

All of these
Condensation of mixed vapour in a condenser
Baffled heat exchanger
Multipass heat exchanger

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Heat Transfer
Harmonic mean temperature difference is given by

√(ΔT₁ . ΔT₂)
2.(ΔT₁ . ΔT₂)/(ΔT₁ + ΔT₂)
(ΔT₁ - ΔT₂)/(ΔT₁ . ΔT₂)
2.(ΔT₁ . ΔT₂)(ΔT₁ - ΔT₂)

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MORE MCQ ON Heat Transfer

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