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Process Equipment and Plant Design

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

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

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Process Equipment and Plant Design
In a continuous distillation column, the optimum reflux ratio ranges from __________ times the minimum reflux ratio.

2.2 to 2.6
2.7 to 3
1.6 to 2
1.1 to 1.5

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Process Equipment and Plant Design
Accidents in chemical plants are mostly due to

Faulty operating procedures
Improper layout of the equipments
Inadequate equipment design
Failure of equipments

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Process Equipment and Plant Design
The normal range of velocity of water in pipes is __________ m/sec.

1-2
0.1-0.5
15-30
10-50

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Process Equipment and Plant Design
Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is

About 0.33 times
Less
Same
About 3 times

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Process Equipment and Plant Design
A cylinderical pressure vessel of volume 6 πm³ has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm² and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to

8 mm
5 mm
10 mm
6 mm

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