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Heat Transfer

Heat Transfer
The range of electromagnetic spectrum important in heat transfer by radiation is __________ microns.

0.5-50
5-50
0.38-0.78
100-1000

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Heat Transfer
In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is

Maximum
Infinity
Minimum
Zero

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Heat Transfer
The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is

Nusselt number
Sherwood number
Stanton number
Schmidt number

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

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Heat Transfer
Nucleate boiling is promoted

On rough surfaces
In the absence of agitation
On polished surfaces
None of these

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Heat Transfer
If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid

Remains unchanged
Decreases
Increases or decreases depending on number of shell passes
Increases

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