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Heat Transfer

Heat Transfer
Grashhoff number is given by

gD2βΔtP²μ
gD2βΔtρ/μ²
gD³.β.Δtρ²/μ²
gD³βΔtP²/μ

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Heat Transfer
Graetz number is given by

kμ/mCp
mCp/kμ
kL/mCp
mCp/kL

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Heat Transfer
The value of Stefan-Boltazman constant in SI unit is

5.6697 x 10-8kcal/m² . °K4
0.1714 x 10-8W/m².°K4
0.1714 x 10-8kcal/m². °K4
5.6697 x 10-8W/m².°K4

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Heat Transfer
Which of the following has the minimum thermal conductivity?

Steel
Carbon black
Nitrogen
Tar

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

Smooth
Glazed
Oily
Coated

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Heat Transfer
The sum of reflectivity and absorptivity for an opaque body is equal to

2
1
0.5

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MORE MCQ ON Heat Transfer

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