In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the

In a distillation column, bubble caps are located on trays with a pitch of __________ times the outside diameter of the caps.

A

1.3 to 2

B

1.6 to 2

C

2.5

D

1.5 to 3

Two-fifths of the caps in a box are red, one-fourth are blue and the rest are green. What is the ratio of the green caps to the blue caps?

A

5 : 8

B

5 : 7

C

7 : 8

D

8 : 7

In distillation columns, the number of bubble caps per tray primarily depends upon the

A

Allowable liquid velocity

B

Allowable gas velocity

C

Allowable gas and liquid velocities

D

Feed composition

In a distillation column, minimum clearance to be maintained betweeen the overflow weir and the last row of the bubble caps is __________ cms.

A

2.5

B

7.5

C

15

D

20

In the allocated cap area, bubble caps are generally arranged on equilateral triangular pitch. Number of caps fixed on a plate is with a

A

Clearance of 25-75 mm

B

Cap pitch of 1.3-2 times the cap diameter

C

Either A or B

D

Neither A nor B

For a given design of bubble cap, the number of bubble caps to be used per tray is set by the

A

Allowable gas velocity through the slots

B

Plate spacing

C

Diameter of the column

D

All of the above

In distillation columns, bubble caps are held in place over trays by

A

Rivets

B

A hold down bar

C

Bolts

D

Both B and C

When a uniformly distributed load, longer than the span of the girder, moves from left to right, then the maximum bending moment at mid section of span occurs when the uniformly distributed load occupies

A

Less than the left half span

B

Whole of left half span

C

More than the left half span

D

Whole span

The natural frequency of free transverse vibrations due to uniformly distributed load acting over a simply supported shaft is (where $$\delta {\text{S}}$$ = Static deflection of simply supported shaft due to uniformly distributed load)

A

$$\frac{{0.4985}}{{\sqrt {\delta {\text{S}}} }}$$

B

$$\frac{{0.5615}}{{\sqrt {\delta {\text{S}}} }}$$

C

$$\frac{{0.571}}{{\sqrt {\delta {\text{S}}} }}$$

D

$$\frac{{0.6253}}{{\sqrt {\delta {\text{S}}} }}$$

In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower.

A

Molal flow rate of vapour

B

Vapour molecular weight

C

Pressure and temperature

D

All of the above

In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the

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