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Heat Transfer

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

Long tube
Agitated film
None of these
Open pan

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Heat Transfer
The value of Stefan-Boltazman constant in SI unit is

0.1714 x 10-8W/m².°K4
5.6697 x 10-8W/m².°K4
5.6697 x 10-8kcal/m² . °K4
0.1714 x 10-8kcal/m². °K4

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Heat Transfer
In which mode of heat transfer, the Biot number is important?

Transient heat conduction
Forced convection
Radiation
Natural convection

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Heat Transfer
In SI units, fouling factor is expressed in

W/m²°K
m²°K/W
m²°K
m°K/W

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Heat Transfer
Multipass heat exchangers are used

For low heat load
To reduce the pressure drop
Because of simplicity of fabrication
To obtain higher heat transfer co-efficient and shorter tube

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Heat Transfer
Prandtl and Reynold's analogies are identical for Prandtl number value of

1
0.5
5

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