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Heat Transfer

Heat Transfer
Calburn analogy is applicable for the value of Prandtl number from

0.5 to 5
0.6 to 120
0.001 to 1
120 to 400

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Heat Transfer
As per Kirchoffs law, the ratio of the total radiating power to the absorptivity of a body depends on the

nature of material of body
none of the listed here
temperature of the body only
wavelength of monochromatic radiation

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Heat Transfer
At constant temperature, the thermal conductivities of gases __________ with rise in pressure.

Decrease
Remain unchanged
May increase or decrease; depends on the pressure
Increase

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Heat Transfer
With increase in temperature, the thermal conductivity of steel

Decreases
Remains unchanged
Increases
Increases exponentially

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Heat Transfer
Grashhoff number is given by

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

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Heat Transfer
Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is

Thin walled having the value of Ao Ai/< 2
Thick walled
Having the value of Ao/Ai > 2
Both B and C

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MORE MCQ ON Heat Transfer

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