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Heat Transfer

Heat Transfer
Peclet number (Pe) is given by

Pe = Nu.Re
Pe = Re.Pr
Pe = Re/Pr
Pe = Pr/Re

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Heat Transfer
(Cp . μ)/K is termed as the __________ number.

Grashoff
Nusselt
Stanton
Prandtl

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Heat Transfer
With increase in temperature, the total emissivity of conductors

Decreases linearly
Remains same
Decreases
Increases

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Heat Transfer
In forced convection, the heat transfer depends on

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

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Heat Transfer
Dropwise condensation of steam on cooling surface is promoted

When both the steam and the tube are clean
An oily surface
None of these
Only in presence of air

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Heat Transfer
The actual temperature drop across the heating surface of an evaporator depends on the

Pressure difference between the steam chest and the vapor space above the boiling liquid
Solution being evaporated
All of these
Liquid depth over the heating surface

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