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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
20
35

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Process Equipment and Plant Design
Which of the following material is seldom used for pressure vessel construction?

Mild steel
Semi-killed steel
Rimmed still
Killed steel

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Process Equipment and Plant Design
Maximum size of the raschig rings used in a packed tower is about __________ of the coloumn diameter.

1/20th
1/50th
1/10th
1/30th

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Process Equipment and Plant Design
Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always

More than arithmetic mean value
More than geometric mean value
Both B & C
Less than arithmetic mean value

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Process Equipment and Plant Design
__________ tower is the most suitable gas-liquid contacting device involving highly corrosive fluids.

Packed
Sieve plate
Bubble cap plate
None of these

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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

Same
About 3 times
About 0.33 times
Less

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