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Process Equipment and Plant Design

Process Equipment and Plant Design
Back-trapping in a distillation column results due to

Excessive liquid gradient over the tray
Low gas velocity
Low reflux ratio
High gas velocity

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Process Equipment and Plant Design
What is the value of 'q' for saturated vapor feed to a distillation column ?(where q = fraction of the feed stream that is liquid.)

1
> 1

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Process Equipment and Plant Design
The most common standard size of bubble caps used in industrial operation is

1" dia cap with 0.5" dia riser
4" dia cap with 8" dia riser
8" dia cap with 1" dia riser
6" dia cap with 4" dia riser

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Process Equipment and Plant Design
Apex angle of conical heads used in the bottom heads of chemical process equipments is usually

60°
45°
75°
30°

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Process Equipment and Plant Design
Lug support is

Provided usually for vessels of much smaller height than skirt supported vessels
Same as bracket support
All of these
The most suitable for thick vertical vessel

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Process Equipment and Plant Design
Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of __________ times the paddle diameter.

0.1 to 0.25
0.3 to 0.5
0.5 to 0.6
0.65 to 0.80

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