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Process Equipment and Plant Design

Process Equipment and Plant Design
Normally, the length to diameter ratio of rotary dryers varies form 4 to 10 and for its economic operation, the number of transfer units (NTU) for such dryers varies from

1.5-2.5
3.5-5.5
44119
7.5-10.0

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Process Equipment and Plant Design
__________ closure is the weakest enclosure for cylindrical vessels.

Hemispherical
Torispherical
Conical or flat plate
Elliptical

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Process Equipment and Plant Design
In case of bubble cap distillation column of diameter greater than 1.2 metres, the cap diameter is roughly about __________ cms.

10
35
20
30

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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 - dt)/ph
(ph - dh)/ph
(ph - dh)/dh

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Process Equipment and Plant Design
For identical situation, condensing film coefficient in case of a horizontal condenser is almost __________ the value expected in case of vertical condenser.

Five times
Twice
Thrice
Half

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Process Equipment and Plant Design
Liquid redistribution should be done in a packed tower packed with raschig rings every 6 metres or __________ times the column diameter, whichever is lower.

15-20
10-12.5
5-7.5
2.5-3.0

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