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Heat Transfer

Heat Transfer
An ejector is used to

Remove condensate
None of these
Increase temperature
Increase pressure

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Heat Transfer
Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.

1
18
7
26

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Heat Transfer
The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are

Re.Gz
Nu, Gz
Nu, Pr
Nu, Pr, Re

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Heat Transfer
A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides

Both A & B
Higher economy
Lower capacity
Lower economy

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Heat Transfer
The Grashoff number is defined as the ratio of the

buoyancy to surface tension forces
buoyancy to inertial forces
buoyancy to viscous forces
inertial to viscous forces.

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

Carbon black
Tar
Nitrogen
Steel

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