Pick out the wrong statement about the design of a sieve plate column.

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

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

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

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

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

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

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

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Process Equipment and Plant Design
Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger

Both B and C

Permits the use of more tubes in a given shell diameter

Facilitates comparatively easier external cleaning because of large clearance

Permits the use of less tubes in a given shell diameter

Both B and C

Permits the use of more tubes in a given shell diameter

Facilitates comparatively easier external cleaning because of large clearance

Permits the use of less tubes in a given shell diameter

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Process Equipment and Plant Design
Movement of pipeline caused by thermal expansion is taken care by providing

Changes in its direction

Expansion joint

All of these

Change in the shape of pipeline

Changes in its direction

Expansion joint

All of these

Change in the shape of pipeline

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Process Equipment and Plant Design
The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles?

To provide support to the tube bundle

To increase the residence time of shell side fluid

To reduce the induced vibration in the tubes

To increase the tube side heat transfer co-efficient by inducing turbulence

To provide support to the tube bundle

To increase the residence time of shell side fluid

To reduce the induced vibration in the tubes

To increase the tube side heat transfer co-efficient by inducing turbulence

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Process Equipment and Plant Design
Overall tray efficiency of a distillation column is the ratio of the number of

None of these

Real trays required to the number of ideal trays required

Overall gas transfer units to the number of ideal trays required

Ideal trays required to the number of real trays required

None of these

Real trays required to the number of ideal trays required

Overall gas transfer units to the number of ideal trays required

Ideal trays required to the number of real trays required

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Process Equipment and Plant Design
Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if

Plain carbon steel and cast iron parts are used

Wall thickness is > 30 mm

Material of construction is high alloy steel

Both B & C

Plain carbon steel and cast iron parts are used

Wall thickness is > 30 mm

Material of construction is high alloy steel

Both B & C

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Process Equipment and Plant Design

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

Process Equipment and Plant Design Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger

Process Equipment and Plant Design Movement of pipeline caused by thermal expansion is taken care by providing

Process Equipment and Plant Design The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles?

Process Equipment and Plant Design Overall tray efficiency of a distillation column is the ratio of the number of

Process Equipment and Plant Design Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if

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

Process Equipment and Plant Design
Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger

Process Equipment and Plant Design
Movement of pipeline caused by thermal expansion is taken care by providing

Process Equipment and Plant Design
The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles?

Process Equipment and Plant Design
Overall tray efficiency of a distillation column is the ratio of the number of

Process Equipment and Plant Design
Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if