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Heat Transfer

Heat Transfer
What is the steam economy in case of a single effect evaporator system?

>1
< 1
0.1
1

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Heat Transfer
Which of the following is the most widely used heat insulating material for pipelines carrying steam?

Cotton followed by aluminium foil
Tar dolomite bricks followed by asbestos
Fireclay refractory followed by aluminium sheet
85% magnesia cement and glass wool

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Heat Transfer
In forced convection, the heat transfer depends on

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

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Heat Transfer
In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.

Local
Saturated
Nucleate
Pool

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Heat Transfer
In SI units, thermal conductivity is expressed in

Watt/m². °K
Watt/m4. °K
Watt/m². °K
Watt/m.°K

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Heat Transfer
Circulation pump is located below the evaporater to

Avoid cavitation
Avoid frequent priming
Create more suction head
None of these

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