Process Equipment and Plant Design MCQs

Question 1

Maximum plate efficiency is achieved in case of __________ flow.

Accepted Answer

Cross

Answer

Split

Answer

Cascade

Answer

Reverse

Question 2

Bubble cap diameter used for the distillation column having diameter ranging from 1.5 to 4.5 metres is about __________ mm.

Accepted Answer

100

Answer

10

Answer

50

Answer

150

Question 3

In case of plain carbon steel, butt welded joints are used for shell plate thickness ≤ __________ cms. .

Accepted Answer

3.8

Answer

1.2

Answer

0.5

Answer

6.8

Question 4

Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, $$\sigma $$ = yield strength and E = modulus of elasticity)

Accepted Answer

$$\frac{\sigma }{{	ext{E}}}$$

Answer

E

Answer

$$\sigma $$

Answer

$$\frac{{	ext{E}}}{\sigma }$$

Question 5

The most common standard size of bubble caps used in industrial operation is

Accepted Answer

6" dia cap with 4" dia riser

Answer

1" dia cap with 0.5" dia riser

Answer

8" dia cap with 1" dia riser

Answer

4" dia cap with 8" dia riser

Question 6

Pressure drop per tray in the atmospheric distillation column is about __________ psi.

Accepted Answer

0.07 - 0.12

Answer

0.01 - 0.5

Answer

0.5 - 1.0

Answer

1 - 3

Question 7

Pick out the wrong statement pertaining to a shell and tube heat exchanger.

Accepted Answer

Disk and doughnut baffle is the most commonly used baffle

Answer

The minimum value of baffle spacing is 50 mm

Answer

The maximum value of baffle spacing is equal to the I.D. of the shell

Answer

The maximum unsupported tube span is generally about 75 times tube diameter, but is reduced to about 60 times for aluminium, copper & alloys of these

Question 8

Pick out the wrong statement.

Accepted Answer

None of these

Answer

If sufficient residence time (around 8 seconds) is not proivided to the downcoming liquid in the downcomer, it may entrain some vapour

Answer

The liquid head in the downcomer should not be greater than one half the plate spacing to avoid flooding

Answer

The dischare end of the downcomer must project far enough into the tray liquid so that no gas bubbles can enter the open end and by pass the bubble caps

Question 9

__________ tray arrangement is recommended for distillation column having diameter upto 4 ft.

Accepted Answer

Cross flow

Answer

Radial flow

Answer

Split flow

Answer

Cascade