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Heat Transfer

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

20
30
1
10

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Heat Transfer
For small temperature difference, the heat transfer rate as per Newton's law of cooling is proportional to (where, Δt = excess temperature)

Δt
Δt²
Δt³
√Δt

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Heat Transfer
The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium. This is __________ law.

Stefan-Boltzman
Planck's
Wien's displacement
Kirchoffs

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Heat Transfer
The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is

43832
4
2
43834

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Heat Transfer
Which characteristic of a fluid is not important in deciding its route in a shell and tube heat exchanger?

Corrosiveness
None of these
Viscosity
Fouling characteristic

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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

Zero
Minimum
Infinity
Maximum

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