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Heat Transfer

Heat Transfer
In a boiling curve, the peak heat flux is called the __________ point.

Boiling
Leidenfrost
Burnout
Nusselt

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Heat Transfer
Pick out the correct equation.

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

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Heat Transfer
The unit of conductance in SI unit is

W/°K
W/m²
W/m°K
W/m

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Heat Transfer
In thermal radiation for a black body (where, ε is emissivity and α is absorptivity)

α = 1; ε ≠ 1
α ≠ 1, ε ≠ 1
α = 1; ε = 1
α ≠ 1, ε = 1

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Heat Transfer
Stefen's block body radiation law can also be derived from __________ law.

Fourier's
Kirchoffs
None of these
Planck's

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Heat Transfer
Which of the following has the lowest overall heat transfer co-efficient?

Molten sodium
Water
Dowtherm
Air

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