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Heat Transfer

Heat Transfer
For what value of Prandtl number, the Col-burn analogy is valid ?

l to 50
1 to 103
0.06 to 120
0.6 to 120

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

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Heat Transfer
LMTD can't be used as such without a correction factor for the

Condensation of mixed vapour in a condenser
Baffled heat exchanger
Multipass heat exchanger
All of these

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Heat Transfer
A black body does not __________ radiation.

Reflect
Both B & C
Absorb or emit
Refract

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Heat Transfer
In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is

None of these
Zero
Infinity
Same as average heat transfer co-efficient for tube side

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Heat Transfer
Which of the following is the most controlling factor for the rate of bubble detachment from the hot solid surface?

Liquid viscosity
Liquid density
Hot surface temperature
Interfacial tension

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