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Process Equipment and Plant Design

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

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

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Process Equipment and Plant Design
An increase in the liquid resistance to interphase mass transfer and a resultant reduction in plate efficiency is caused by

All of these
An increase in liquid viscosity
An increase in relatived volatility for rectification columns
Decrease in gas solubility for absorbers

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Process Equipment and Plant Design
In case of bubble cap distillation column of diameter greater than 1.2 metres, the cap diameter is roughly about __________ cms.

10
35
20
30

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Process Equipment and Plant Design
An underdesigned steam trap will

None of these
Waste steam
Back up condensate and cause water hammer in steam line
Destroy itself of acceleration wear due to rapid recycling

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Process Equipment and Plant Design
In hydrostatic testing of welded pipe (for leakage, strength etc.) the ratio of minimum hydrostatic test pressure to internal design pressure is around

2.5
1.5
3.5
0.5

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Process Equipment and Plant Design
The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called

Downcomer liquid seal
Skirt clearance
None of these
Static submergence

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