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Process Equipment and Plant Design

Process Equipment and Plant Design
Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is __________ the longitudinal stress.

Equal to
Twice
Eight times
Half

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Process Equipment and Plant Design
Rotary driers are most economically designed for the number of heat transfer units (HTU) from

0.01 to 1
10 to 20
5 to 10
1.5 to 2.5

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Process Equipment and Plant Design
Tube wall thickness depends on the cor-rosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than __________ mm outside diameter is generally not recommended for fouling fluids.

16
28
38
19

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Process Equipment and Plant Design
Larger depth of liquid on the trays of a distillation column

Leads to high tray efficiency
Results in higher pressure drop per tray
Both A & B
Neither A nor B

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Process Equipment and Plant Design
Height of the flights in the rotary drier is in the range of

0.5 to 0.6 d
0.08 to 0.12 d
0.2 to 0.5 d
0.02 to 0.05 d

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Process Equipment and Plant Design
In perforated plate towers, the

Total hole area may be around 6 to 15% of tower cross-sectional area
All of these
Hole sizes may be around 1/8" or 3/16"
Pressure drop is less compared is similar bubble cap towers

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