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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.

20
35
5
55

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Process Equipment and Plant Design
To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of

(1.2)5/3
(1.2)3/2
(1.2)3/5
(1.2)2/3

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

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Process Equipment and Plant Design
Friction factor for turbulent flow in a new pipe is given by

f = 25/NRe
f = 0.22 NRe0.05
f = 0.04/NRe0.16
f = 16/NRe

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Process Equipment and Plant Design
Bubble cap plate column is

A continuous contactor
A finite stage contactor
Used only for distillation, not for absorption
A differential stage contactor

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Process Equipment and Plant Design
Normally, the ratio of the total riser area to the tower cross sectional area (for bubble cap towers of diameter more than 3 ft) is around

0.4-0.6
0.55-0.85
0.1-0.2
0.35-0.75

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