Length to diameter ratio of most rotary driers is in the range of

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

20 to 30

4 to 10

1 to 2

10 to 20

20 to 30

4 to 10

1 to 2

10 to 20

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Process Equipment and Plant Design
Pick out the wrong statement about the design of a sieve plate column.

An increased weir height improves the tray efficiency at the cost of high plate pressure drop; optimum wear height being 40-90 mm for column pressure above atmospheric and 6-12 mm for vacuum columns

For segmental downcomers, the chord length is 60-80% of the column diameter. An initial value of downcomer area of 12% is taken in the design

Width of the calming section provided at the inlet and outlet sides of the plate is 75 mm for column diameter below 1.5 metres and 100 mm for larger diameter columns

Minimum recommended downcomer residence time for the disengagement of entrained vapour is the same for both foaming and non-foaming liquids, which is about 20 seconds

An increased weir height improves the tray efficiency at the cost of high plate pressure drop; optimum wear height being 40-90 mm for column pressure above atmospheric and 6-12 mm for vacuum columns

For segmental downcomers, the chord length is 60-80% of the column diameter. An initial value of downcomer area of 12% is taken in the design

Width of the calming section provided at the inlet and outlet sides of the plate is 75 mm for column diameter below 1.5 metres and 100 mm for larger diameter columns

Minimum recommended downcomer residence time for the disengagement of entrained vapour is the same for both foaming and non-foaming liquids, which is about 20 seconds

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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)3/5

(1.2)3/2

(1.2)5/3

(1.2)2/3

(1.2)3/5

(1.2)3/2

(1.2)5/3

(1.2)2/3

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Process Equipment and Plant Design
Pick out the wrong statement about the design of seive plate column and the bubble cap column.

The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns

Weir length for a bubble cap plate is the same as that for the seive plate

Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the seive plate

Weir height for a bubble cap plate column is the same as that for a seive plate column

The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns

Weir length for a bubble cap plate is the same as that for the seive plate

Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the seive plate

Weir height for a bubble cap plate column is the same as that for a seive plate column

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Process Equipment and Plant Design
The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called

Downcomer liquid seal

None of these

Skirt clearance

Static submergence

Downcomer liquid seal

None of these

Skirt clearance

Static submergence

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Process Equipment and Plant Design
The practical representative values of HETP for a number of commercial operations lies within a range of __________ metre.

1.2-1.5

0.1-0.2

0.4-0.9

0.2-0.5

1.2-1.5

0.1-0.2

0.4-0.9

0.2-0.5

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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

Process Equipment and Plant Design Pick out the wrong statement about the design of a sieve plate column.

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

Process Equipment and Plant Design Pick out the wrong statement about the design of seive plate column and the bubble cap column.

Process Equipment and Plant Design The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called

Process Equipment and Plant Design The practical representative values of HETP for a number of commercial operations lies within a range of __________ metre.

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

Process Equipment and Plant Design
Pick out the wrong statement about the design of a sieve plate column.

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

Process Equipment and Plant Design
Pick out the wrong statement about the design of seive plate column and the bubble cap column.

Process Equipment and Plant Design
The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called

Process Equipment and Plant Design
The practical representative values of HETP for a number of commercial operations lies within a range of __________ metre.