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Process Equipment and Plant Design

Process Equipment and Plant Design
Welded joint efficiency in the design of chemical process equipment is taken as

0.75
0.95
0.85
0.55

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Process Equipment and Plant Design
Maximum plate efficiency is achieved in case of __________ flow.

Cross
Split
Cascade
Reverse

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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

7.5-10.0
44119
3.5-5.5
1.5-2.5

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Process Equipment and Plant Design
Wind load consideration in the design of a support can be neglected, when the vessel is

Tall (say 30 metres), but is full of liquid
Short (< 2 m) and housed indoor
Tall but empty
None of these

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

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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.

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

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