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Heat Transfer

Heat Transfer
A BTU/hr.ft.2 °F is equal to

1 kcal/hr. m²°C
1 kcal/hr. m².°K
4.88 kcal/hr. m.2°C
None of these

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Heat Transfer
Economy of a multiple effect evaporator is not influenced much by the

boiling point elevations
rate of heat transfer
temperature of the feed
ratio of the weight of the thin liquor to thick liquor

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Heat Transfer
An ejector is used to

None of these
Increase temperature
Increase pressure
Remove condensate

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Heat Transfer
Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

32
45
50
37

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Heat Transfer
The separation of liquid droplets from the vapor is done by a/an __________ , in the evaporators.

Compressor
Entrainment separator
Vacuum pump
Steam ejector

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Heat Transfer
For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it

All of these
Occupies smaller space
Is more economical
Is easy to operate and maintain

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