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Process Equipment and Plant Design

Process Equipment and Plant Design
Tube height in a calendria type evaporator is normally less than __________ metres.

5.5
3.5
1
2

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

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

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Process Equipment and Plant Design
In case of 1.5" heat exchanger tubes, the inside flow area __________ with decrease in BWG.

Remains same
Decreases
None of these
Increases

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Process Equipment and Plant Design
Smaller sized packings are generally dumped to the packed columns, and the large ones of size greater than __________ mm are stacked individually, which provides better control over bed porosity and offers lower gas pressure drop.

150
75
25
50

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Process Equipment and Plant Design
Safety valves are provided in chemical equipments to guard against excessive

Turbulence
Temperature
Noise
Pressure/pressure fluctuation

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Process Equipment and Plant Design
An adequate clearance between the tray and the shell wall of a distillation column is provided to

Allow for thermal expansion and facilitate installation
Avoid back-trapping
None of these
Drain the liquid from the tray when the unit is not in operation

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