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Process Equipment and Plant Design

Process Equipment and Plant Design
Needle valves are generally not used for

High pressure throttling service
Smaller sizes of pipe
Very accurate flow control
Very large diameter pipes

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Process Equipment and Plant Design
To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of

(1.2)5/3
(1.2)3/2
(1.2)3/5
(1.2)2/3

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Process Equipment and Plant Design
The safe distance of habitation from a hazardous chemical plant (TLV of its product < 1000 ppm) should be about __________ kms.

15
1
5
25

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Process Equipment and Plant Design
In the agitators, the power required will be changed with the increase of diameter of agitator (D) as

D⁹
D
D²
D⁵

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Process Equipment and Plant Design
In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area.

5 to 10
10 to 15
0.5 to 1.5
2.5 to 4.0

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

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

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