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Process Equipment and Plant Design

Process Equipment and Plant Design
At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally.

Higher
Unpredictable
Same
Lower

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Process Equipment and Plant Design
Pressure drop due to pipe fittings can be estimated by the equation, ΔP/p = 4f.Le/D.V2/2gc, where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of Le/D (dimensionless) for 45° elbow and 180° close return bends would be respectively around

45 and 75
180 and 300
5 and 10
300 and 500

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Process Equipment and Plant Design
The thickness of heat transfer plates used in the plate type heat exchanger ranges from __________ mm, pressed in a single piece provided with grooves & corrugations.

44055
1.25 to 3.125
3.5 to 7.0
0.3 to 0.8

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Process Equipment and Plant Design
Power required for agitation depends upon the

Size of agitator & the tank
Agitator type & speed of agitation
All of these
Height & properties of the liquid

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Process Equipment and Plant Design
Liquid gradient over the tray results due to the

Large reflux ratio
Resistance offered to flow of liquids by caps & risers and the flow of gas
Large plate spacing
Low gas velocity

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Process Equipment and Plant Design
The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is

0.25
0.5
0.75
1.25

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