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Process Equipment and Plant Design

Process Equipment and Plant Design
In most of the shell and tube heat exchangers, the tube pitch is generally __________ the tube diameter.

2.5 times
1.25-1.50 times
Less than
One-fourth of

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

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

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Process Equipment and Plant Design
In a shell and tube heat exchanger, tube side __________ of the mass velocity.

Pressure drop is proportional to the square
Both A & B
Heat transfer co-efficient is proportional to 0.8th power
Neither A nor B

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Process Equipment and Plant Design
Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if

Plain carbon steel and cast iron parts are used
Wall thickness is > 30 mm
Material of construction is high alloy steel
Both B & C

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Process Equipment and Plant Design
Friction factor for turbulent flow in a new pipe is given by

f = 16/NRe
f = 0.22 NRe0.05
f = 25/NRe
f = 0.04/NRe0.16

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Process Equipment and Plant Design
In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the

Small downcomer liquid seal
Lower skirt clearance
Liquid gradient on the tray
Lower static submergence

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