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Process Equipment and Plant Design

Process Equipment and Plant Design
Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about __________ mm Hg (referred to a 760 mm mercury barometer).

250
750
450
650

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Process Equipment and Plant Design
For a cylinderical internally pressurised vessel, which of the following closure types would withstand highest pressure, if each closure is of the same material and thickness?

Flat plate
Conical
Ellipsoidal (2 : 1)
Hemispherical

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Process Equipment and Plant Design
In a distillation column, the minimum residence time for liquid in the downspout is about __________ seconds.

1
180
8
80

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Process Equipment and Plant Design
For identical operating conditions, the pressure drop over __________ tray is the highest out of the following.

Bubble cap
Counterflow
Valve
Sieve

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Process Equipment and Plant Design
Which of the following packing materials provides for maximum mass transfer?

Raschig rings
All of these
Cross-partition rings
Lessig rings

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Process Equipment and Plant Design
Diameter of the seive tray column is determined by the

Lower limit of vapour velocity
Hole diameter of the seive tray
Height of the plate spacing
Upper limit of the vapour velocity

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