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Heat Transfer

Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Corrosive
Scaling
Salty
Highly viscous

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Heat Transfer
The left face of a one dimensional slab of thickness 0.2 m is maintained at 80°C and the right face is exposed to air at 30°C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the right face is 10 W/m².K. At steady state, the temperature of the right face in °C is

71.2
48.7
77.2
63.8

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Heat Transfer
Electro-magnetic spectrum range, which is important for radiation varies from __________ microns.

100 to 1000
1 to 100
10 to 100
0.5 to 50

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Heat Transfer
As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient

goes through a maximum.
continues to decrease
continues to increase
goes through a minimum

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Heat Transfer
In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used

To prevent corrosion of the tube bundles
In low range of temperature differences
In high range of temperature differences
Because of its low cost

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Heat Transfer
An ejector is used to

Increase pressure
None of these
Remove condensate
Increase temperature

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