PROCESS EQUIPMENT AND PLANT DESIGN QUIZ

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

Greater cost for the condenser coolant

Greater cost for the reboiler heat supply

All of these

Lower fixed charges for the column

TRUE ANSWER : ?
YOUR ANSWER : ?

Brass valves are usually made for pipe sizes __________ inches.

>2.5

?1

?2

>3.5

TRUE ANSWER : ?
YOUR ANSWER : ?

With increase in the number of shell passes, the value of FT

Decreases

Increases

Remains same, only if the number of tube passes does not change

Remains same

TRUE ANSWER : ?
YOUR ANSWER : ?

Maximum size of the raschig rings used in a packed tower is about __________ of the coloumn diameter.

1/30th

1/20th

1/50th

1/10th

TRUE ANSWER : ?
YOUR ANSWER : ?

Le/D for fully open gate valves would be

Much more than that for fully open globe valves

Around 7

Both B and C

Much less (say 2% than that for fully open globe valves)

TRUE ANSWER : ?
YOUR ANSWER : ?

Pick out the wrong statement pertaining to the design of the distillation column.

Generally, a skirt clerance of 0.5" to 1.5' is recommended to prevent plugging of the slots by residue build up

None of these

The purpose of the slot is to disperse the gas into the liquid in the form of small bubbles

If sufficient slot area is not provided, the gas may pass through the skirt clearance

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Liquid gradient on the tray

Lower static submergence

Small downcomer liquid seal

Lower skirt clearance

TRUE ANSWER : ?
YOUR ANSWER : ?

Tube wall thickness depends on the cor-rosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than __________ mm outside diameter is generally not recommended for fouling fluids.

16

38

28

19

TRUE ANSWER : ?
YOUR ANSWER : ?

Height of the flights in the rotary drier is in the range of

0.08 to 0.12 d

0.2 to 0.5 d

0.5 to 0.6 d

0.02 to 0.05 d

TRUE ANSWER : ?
YOUR ANSWER : ?

Baffle width is normally taken as __________ times the tank diameter.

0.45-0.6

0.4-0.5

0.1-0.12

0.2-0.45

TRUE ANSWER : ?
YOUR ANSWER : ?