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Heat Transfer

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

> 0.6
< 0.1
< 0.5
0.5

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

none of the listed here
0°K
100°C
0°C

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Heat Transfer
The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the

None of these
Solution has an elevation of boiling point
Evaporators operate under vacuum
Evaporators opreate at atmospheric pressure

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Heat Transfer
A graph between __________ is called Wilson plot.

1/U Vs . 1/v0.8
1/v0.8 Vs . U
V0.8 Vs . U
1/U Vs . 1/V

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Heat Transfer
Value of Prandtl number for water ranges from

L to 2
1000 to 2000
5 to 10
100 to 500

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Heat Transfer
Corrosiveness of steam condensate is due to the presence of

Neither A nor B
Both A & B
CO₂
Dissolved O₂

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