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Process Equipment and Plant Design

Process Equipment and Plant Design
The equivalent diameter for fluid flow through a channel of constant non-circular cross section of area 'A' is given by (where, P = perimeter of the channel in contact with the fluid)

4 P/A
√A
4 A/P
A/P

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Process Equipment and Plant Design
Back-trapping in a distillation column results due to

Excessive liquid gradient over the tray
Low gas velocity
High gas velocity
Low reflux ratio

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Process Equipment and Plant Design
The retention time of material in a rotary dryer depends upon its

Flights arrangement
Rpm
Slope & length
All of these

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Process Equipment and Plant Design
Maximum size of the raschig rings used in a packed tower is about __________ of the coloumn diameter.

1/20th
1/30th
1/50th
1/10th

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Process Equipment and Plant Design
With increase in gas flow rate to fabric surface area ratio (Nm³/hr/m² fabric surface area), the size & the cost of a bag filter

None of these
Decreases
Remain unaffected
Increases

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Process Equipment and Plant Design
Where does the maximum tensile strength occur in a thick cylindrical vessel subjected to internal pressure?

None of these
At the outer surface
At the mid thickness of the cylindrical wall
At the inner surface

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