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Heat Transfer

Heat Transfer
For an ideal black body

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

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Heat Transfer
Heat flux through several resistances in series in analogous to the current flowing through several.

capacitors in series
resistances in parallel
resistances in series
none of the listed here

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Heat Transfer
__________ heat exchanger is used for chilling oil to be dewaxed.

Fixed tube
Double pipe
Floating head
U-tube

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Heat Transfer
The steam ejector is used to

None of these
Superheat the steam
Create vacuum
Remove condensate from the steam pipelines

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Heat Transfer
The purpose of providing a 'catchall' in the vapor line of an evaporator is to

Regulate the vapor flow
Vent the non-condensible gases
Arrest the entrained liquid
Create vacuum

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Heat Transfer
Dropwise condensation of steam on cooling surface is promoted

When both the steam and the tube are clean
Only in presence of air
None of these
An oily surface

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