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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

7.5-10.0
44119
1.5-2.5
3.5-5.5

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Process Equipment and Plant Design
The safe distance of habitation from a hazardous chemical plant (TLV of its product < 1000 ppm) should be about __________ kms.

25
15
1
5

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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
80
8

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Process Equipment and Plant Design
Spherical shaped pressure vessel is considered to be the most ideal, because it can

Be fabricated very easily
Be designed without wind load considerations
Be supported very easily
Withstand higher pressure for a given metallic shell thickness

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Process Equipment and Plant Design
25 per cent cut segmental baffle means that the baffle

Spacing is 75% of its height
Width is 25% of its height
Height is 25% of the I.D. of the shell
Height is 75% of the I.D. of the shell

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Process Equipment and Plant Design
The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the __________ stress.

Allowable
None of these
Working
Damaging

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