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Process Equipment and Plant Design

Process Equipment and Plant Design
Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent.

5
35
20
55

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Process Equipment and Plant Design
Rivets are generally specified by the

None of these
Head diameter
Overall length
Shank diameter

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Process Equipment and Plant Design
A perforated plate has holes of diameter dh arranged in a pitch ph. Each hole has a tube of I.D. dt passing through it. The ligament efficiency is given by

(ph - dh . dt/2)/ph
(ph - dh)/dh
(ph - dt)/ph
(ph - dh)/ph

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

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

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Process Equipment and Plant Design
Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin's formula as

D = 1.6 √t
D = 1.5 t
D = 1.1 t
D = 3√t

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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).

650
450
750
250

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