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Heat Transfer

Heat Transfer
In forced convection, the heat transfer depends on

Re, Gr
mainly Gr
Re, Pr
none of the listed here

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Heat Transfer
Indirect contact heat exchangers are preferred over direct contact heat exchangers, because

There is no mist formation
There is no risk of contamination
Cost of equipment is lower
Heat transfer co-efficient are high

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Heat Transfer
Radiation energy is emitted by all the substances, which are above

100°C
0°C
0°K
none of the listed here

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Heat Transfer
For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are

Never different
Different
Same
Linearly related

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Heat Transfer
Which of the following has the highest thermal conductivity ?

Water
Silver
Air
Black

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Heat Transfer
Nusselt number is the ratio of the temperature gradient at the wall to

None of these
Heat flux
That across the entire pipe
Temperature difference

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