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Process Equipment and Plant Design

Process Equipment and Plant Design
In a continuous distillation column, the optimum reflux ratio ranges from __________ times the minimum reflux ratio.

2.7 to 3
2.2 to 2.6
1.1 to 1.5
1.6 to 2

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

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

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Process Equipment and Plant Design
The normal range of velocity of steam in pipes is __________ m/sec.

80-100
0.1-0.5
1-5
10-20

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Process Equipment and Plant Design
In a multipass shell and tube heat exchanger, the problem of differential expansion between the shell and tube passes is taken care of by using a

Floating head tube sheet
U-bend
Either A or B
Neither A nor B

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Process Equipment and Plant Design
A/an __________ is used for changing the direction of a pipeline.

Flange
Union
Disc compensator
Elbow

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Process Equipment and Plant Design
A high vapour velocity is required for high plate efficiency in a seive plate coloumn. The satisfactory value of operating vapor velocity for design purpose in seive plate column is about __________ percent of the flooding velocity.

60
45
95
80

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