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Heat Transfer

Heat Transfer
Viscous & heat sensitive liquids are concentrated in __________ evaporators.

Agitated film
None of these
Long tube
Open pan

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Heat Transfer
Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid

when Grashhoff number is very important
none of the listed here
for fluids in laminar flow
for fluids in tubulent flow

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Heat Transfer
At what value of Prandtl number, the hydrodynamic and thermal boundary layers are identical?

1.5
80
0.5
1

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Heat Transfer
Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called

Conduction
Forced convection
Natural convection
Radiation

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

Nitrogen
Steel
Tar
Carbon black

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Heat Transfer
Dropwise condensation is promoted on a/an __________ surface.

Oily
Coated
Smooth
Glazed

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