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Heat Transfer

Heat Transfer
Reynold's analogy states that

Nst α f
Nst α NRe
NRe α f
NNu α f

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Heat Transfer
Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second.

10
1
20
30

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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

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

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Heat Transfer
In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is __________ the outlet temperature of the cold fluid.

More than
Equal to
Either more or less than (depending upon the fluid)
Less than

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Heat Transfer
Viscous & heat sensitive liquids are concentrated in __________ evaporators.

Agitated film
Long tube
None of these
Open pan

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Heat Transfer
At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe?

< 0.1
0.5
< 0.5
> 0.6

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