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Process Equipment and Plant Design

Process Equipment and Plant Design
Nominal size of a pipe is an indication of its __________ diameter.

None of these
Inner
Approximate
Outer

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Process Equipment and Plant Design
Length to diameter ratio of most rotary driers is in the range of

4 to 10
10 to 20
1 to 2
20 to 30

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Process Equipment and Plant Design
Pressure drop (Δp) and the superficial gas mass velocity (G) in case of packed absorption tower operating in the preloading range are related as

Δp = G2
Δp = G0.5
Δp = G
Δp = 1/G0.6

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Process Equipment and Plant Design
Which of the following packing materials provides for maximum mass transfer?

Cross-partition rings
Lessig rings
All of these
Raschig rings

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Process Equipment and Plant Design
The main purpose of providing stepping on the trays is to

Increase the residence time
Improve the flow condition
Facilitate handling of large flow rate of liquid
Decrease the pressure drop

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Process Equipment and Plant Design
Normally, the ratio of the total riser area to the tower cross sectional area (for bubble cap towers of diameter more than 3 ft) is around

0.4-0.6
0.1-0.2
0.55-0.85
0.35-0.75

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