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Heat Transfer

Heat Transfer
The range of electromagnetic spectrum important in heat transfer by radiation is __________ microns.

100-1000
0.38-0.78
5-50
0.5-50

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Heat Transfer
For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of

1
6.1
1.74
37

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Heat Transfer
The number of kg vaporised per kg of steam fed to the evaporator is defined as

Capacity
Economy
Rate of vaporisation
Rate of evaporation

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Heat Transfer
Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by

Keeping the heat transfer surface clean
None of these
Increasing the tube length
Enhancing the fluid pumping rate

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Heat Transfer
The steam ejector is used to

Remove condensate from the steam pipelines
Superheat the steam
None of these
Create vacuum

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Heat Transfer
Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is

0.1
< 1
>1
L

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