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Process Equipment and Plant Design

Process Equipment and Plant Design
The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is

> 7 < 15
< 7
> 20 < 50
< 30

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Process Equipment and Plant Design
In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D₁ and D₂ are I.D. of inner and outer pipes)

None of these
D₂ - D₁
(D₂² - D₁²)/D₂²
(D₂² - D₁²)/D₁²

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Process Equipment and Plant Design
In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of __________ mm.

44183
43895
44058
43962

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Process Equipment and Plant Design
Speed of industrial paddle agitator ranges from __________ rpm.

20 to 100
1000 to 2000
500 to 750
1 to 5

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

None of these
Packed
Bubble cap plate
Sieve plate

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Process Equipment and Plant Design
To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of

(1.2)5/3
(1.2)3/5
(1.2)2/3
(1.2)3/2

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