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Process Equipment and Plant Design

Process Equipment and Plant Design
Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent.

55
5
35
20

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Process Equipment and Plant Design
In a cylinderical vessel subjected to internal pressure, the longitudinal stress σL and the circumferential stress, σh are related by

σh = σL/2
No relation exists
σh = 2 σL
σh = σL

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Process Equipment and Plant Design
The dust collection efficiency of electrostatic precipitator increases with increase in the

Neither A nor B
Gas flow rate
Both A & B
Electrode area

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Process Equipment and Plant Design
Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is

About 0.33 times
Same
Less
About 3 times

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Process Equipment and Plant Design
In distillation columns, bubble caps are held in place over trays by

Both B and C
A hold down bar
Rivets
Bolts

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Process Equipment and Plant Design
Angled baffles are preferred in the agitation tank to control the swirling action; if the viscosity of the liquid to be mixed is about 200 poise. However, the baffle may be completely eliminated for mixing liquids having viscoisty above __________ poise.

1000
300
1500
600

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