Process Equipment and Plant Design MCQs

Question 1

In packed towers provided with saddle packing, liquid redistributors are positioned at every __________ times column diameter or 6 metres whichever is less.

Accepted Answer

5-8

Answer

2-3

Answer

10-15

Answer

20-25

Question 2

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

Accepted Answer

Either A or B

Answer

Clearance of 25-75 mm

Answer

Cap pitch of 1.3-2 times the cap diameter

Answer

Neither A nor B

Question 3

Pressure differential maintained across a continuous rotary vacuum filter is in the range of __________ mm Hg column.

Accepted Answer

250 to 500

Answer

50 to 100

Answer

100 to 150

Answer

600 to 700

Question 4

1.2 to 3.8 cms is the value of the

Accepted Answer

All of the above

Answer

Downcomer liquid seal in case of a balanced tray design

Answer

Static submergence in case of a bubble cap tray for column operating under pressure (≥ 1 atm.)

Answer

Skirt clearance for bubble caps

Question 5

The function of manholes provided in the shell of a distillation column is to

Accepted Answer

Give access to the individual trays for cleaning, maintenance and installation

Answer

Keep a check on the liquid gradient over the plate by direct visual observation

Answer

Guard against foaming & entrainment by dumping antifoaming agent through it

Answer

All of the above

Question 6

For turbine agitator, the impeller diameter is about

Accepted Answer

0.3 to 0.5 d

Answer

0.1 to 0.2 d

Answer

0.65 to 0.85 d

Answer

0.95 d

Question 7

In case of a continuous distillation column, increase in reflux ratio may result in the

Accepted Answer

All of the above

Answer

Lower fixed charges for the column

Answer

Greater cost for the reboiler heat supply

Answer

Greater cost for the condenser coolant

Question 8

Pick out the wrong statement pertaining to the design of a horizontal tube evaporator.

Accepted Answer

Liquor flows inside the tube, while the steam is outside submerging the tube

Answer

It is unsuitable for concentrating those liquids, which form a scale or deposit salt

Answer

It is suitable for process, in which the final product is a liquor instead of solid

Answer

Its usual dimensions are: tube dia = 2-3 cms; evaporator body dia = 1-4 metres and evaporator height = 2.5-4 metres

Question 9

__________ dished head is the strongest of all.

Accepted Answer

Hemispherical

Answer

Elliptical

Answer

Torispherical

Answer

None of these