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Process Equipment and Plant Design

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

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

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Process Equipment and Plant Design
In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed __________ of the column diameter.

1/5-1/10th
1/20-1/30th
1/10-1/15th
1/2 to 1/4th

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Process Equipment and Plant Design
Cylinderical shell thickness of rotary drier is generally __________ mm.

44180
43990
18-22
43864

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Process Equipment and Plant Design
Width and depth of grooves in the tube sheet holes normally are __________ inch respectively.

1/2 and 5
1/64 and 1/8
1/2 and 8
1/8 and 1/64

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Process Equipment and Plant Design
The retention time of material in a rotary dryer depends upon its

Rpm
All of these
Slope & length
Flights arrangement

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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
(D₂² - D₁²)/D₂²
(D₂² - D₁²)/D₁²
D₂ - D₁

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