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Process Equipment and Plant Design

Process Equipment and Plant Design
Le/D for 90° elbow (medium radius) and 90°square elbow would be respectively around

100 and 250
3 and 5
250 and 600
25 and 60

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Process Equipment and Plant Design
The circumferential (hoop) stress in a thin walled cylinderical vessel under internal pressure is

pd/2t
pd/3t
pd/4t
pd/t

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Process Equipment and Plant Design
The thermal stress in a metallic bar does not depend upon the

Changes in temperature
Neither A nor B
Both A & B
Cross-sectional area

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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

44119
7.5-10.0
3.5-5.5
1.5-2.5

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Process Equipment and Plant Design
With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, FT

Increases very rapidly
Remains constant
Increases linearly
Decreases very rapidly

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Process Equipment and Plant Design
What is the slope of the operating line in the rectifying section of a distillation coloumn?

∞
> 1

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