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Heat Transfer

Heat Transfer
For what value of Prandtl number, St = f/2?

2
> 1
1
1.5

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Heat Transfer
Agitated film evaporator is suitable for concentrating __________ liquids.

Corrosive
Very thin
Viscous
Foaming

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Heat Transfer
Peclet number (Pe) is given by

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

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Heat Transfer
Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be

0.85
0.35
0.45
0.55

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Heat Transfer
Steam is routed through the tube in case of a __________ evaporator.

Short tube vertical
Horizontal tube
Long tube vertical
Basket type

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Heat Transfer
Thermal conductivities of most of the liquids __________ with rise in temperature.

Decreases
Increases
Remains unchanged
May increase or decrease; depends on the liquid

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