Process Equipment and Plant Design MCQs

Question 1

In the design of a shell and tube heat exchanger, the corrosion allowance

Accepted Answer

All of the above

Answer

Need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc

Answer

For carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe conditions it is 3 mm

Answer

For internal cover and tube sheet is provided on both the sides

Question 2

Pick out the correct statement.

Accepted Answer

Risers are generally not connected to the plate in a distillation coloumn by bolts, rivets or welding

Answer

It is preferred to use a vertical condenser for condensation of vapor from a distillation column without sub-cooling

Answer

Draining of residual liquid on tray during shut down of distillation column is facilitated by weep holes

Answer

Random packing a packed tower offers the advantage of lower pressure drop and higher throughput of fluids as compared to regular/stacked packing

Question 3

Overall tray efficiency of a distillation column is the ratio of the number of

Accepted Answer

Ideal trays required to the number of real trays required

Answer

Overall gas transfer units to the number of ideal trays required

Answer

Real trays required to the number of ideal trays required

Answer

None of these

Question 4

Compensation against openings in process vessels for giving inlet and outlet connections, for providing sight glasses and manholes etc. is provided for strength and rigidity. The most efficient type of compensation is of __________ type.

Accepted Answer

Nozzle or rim

Answer

Flared out

Answer

Fluid in

Answer

Ring plate

Question 5

What is the slope of the feed line, if the feed to a distillation column is a saturated liquid?

Accepted Answer

∞

Answer

0

Answer

> 1

Answer

< 1

Question 6

Vertical condenser is advantageous to the horizontal condenser from operation point of view, when

Accepted Answer

Both the functions of condensation & sub cooling are carried out in a single unit

Answer

Hydrostatic head is required for refluxing the condensate

Answer

Only the function of condensation is to be carried out

Answer

Sub cooling of condensate is desired

Question 7

The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the __________ stress.

Accepted Answer

Damaging

Answer

Working

Answer

Allowable

Answer

None of these

Question 8

In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres; ρ = apparent solid density, kg/m 3 ; L = flow rate of dry solids, kg/see.m 2 drier cross-section; H = hold up of solid.)

Accepted Answer

$$\frac{{{	ext{Z}}.{	ext{H}}.ho }}{{	ext{L}}}$$

Answer

$$\frac{{	ext{L}}}{{{	ext{Z}}.{	ext{H}}.ho }}$$

Answer

$$\frac{{{	ext{H}}.ho }}{{	ext{L}}}$$

Answer

$$\frac{{{	ext{Z}}.{	ext{H}}}}{{{	ext{L}}.ho }}$$

Question 9

A cylindrical storage tank can have a self supported conical roof,

Accepted Answer

If its diameter is less than 15-20metres

Answer

If its diameter is more than 50 meters

Answer

If the thickness of the roof is more than that of the cylindrical shell

Answer

Irrespective of its diameter