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Heat Transfer

Heat Transfer
Stefan-Boltzman law applies to __________ body

None of the listed here
black
grey
white

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Heat Transfer
For an ideal black body

Emissivity = 0
Reflectivity = 1
Absorptivity = 1
Transmissivity = 1

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

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

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Heat Transfer
A sphere of radius 'R₁' is enclosed in a sphere of radius 'R₂'. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is

R₂/(R₁+R₂)
(R₁/R₂)2
1

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Heat Transfer
Reynold's analogy states that (where, St = Stanton number f = friction factor)

St = f/4
St = 4f
St = f/2
St = f1/2

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

Planck's
None of these
Kirchoffs
Fourier's

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