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Heat Transfer

Heat Transfer
In SI units, fouling factor is expressed in

m²°K
m°K/W
m²°K/W
W/m²°K

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Heat Transfer
Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube

Exit-fluid temperature > wall temperature
Graetz number > 100
Exit fluid temperature < wall temperature
Exit fluid temperature = wall temperature

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Heat Transfer
What is the unit of thermal conductivity ?

Kcal/hr. m² °C
Kcal/hr. °C
Kcal/hr.m
Kcal/hr.m.°C

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Heat Transfer
A body is called grey if the monochromatic emissivity of the body is

Same for all wavelengths
Different for all wavelengths
Unity
Zero

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Heat Transfer
In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is

Hyperbolic
Linear
None of these
Parabolic

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Heat Transfer
Kirchoff s law applies to __________ radiation

None of the listed here
monochromatic
Both total & monochromatic
total

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