Process Equipment and Plant Design MCQs

Question 1

At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure

Accepted Answer

Remains same

Answer

Increases

Answer

Decreases

Answer

May increase or decrease depending upon the solubility of the gas in the liquid

Question 2

Pick out the wrong statement pertaining to the comparative evaluation of performance of the packed tower and the plate tower.

Accepted Answer

The total weight of a dry plate tower is usually much more than that of a dry packed tower designed for the same duty

Answer

Plate tower is perferred, if interstage cooling is required to remove heats of reaction or solution

Answer

Plate tower is preferred over packed tower, if the operation involves liquids containing dispersed solids

Answer

In operations involving large temperature changes. (e.g. distillation), plate towers are preferred over packed towers as the packing may be crushed due to large temperature changes

Question 3

Rotary driers are most economically designed for the number of heat transfer units (HTU) from

Accepted Answer

1.5 to 2.5

Answer

0.01 to 1

Answer

5 to 10

Answer

10 to 20

Question 4

Steam is preferred to be used as a heating medium in heat exchangers, because of its

Accepted Answer

High latent heat

Answer

Low cost

Answer

Non-corrosive condensate

Answer

High film co-efficient

Question 5

for couplings and unions would be

Accepted Answer

Negligible

Answer

60

Answer

200

Answer

350

Question 6

The distance between the centre of a rivet hole to the nearest edge of the plate is called

Accepted Answer

Margin

Answer

Pitch

Answer

Back pitch

Answer

None of these

Question 7

Baffles may be eliminated for

Accepted Answer

High viscosity liquids (> 600 poise)

Answer

Low viscosity liquids (< 200 poise)

Answer

Large diameter tanks

Answer

None of these

Question 8

Larger depth of liquid on the trays of a distillation column

Accepted Answer

Both A & B

Answer

Leads to high tray efficiency

Answer

Results in higher pressure drop per tray

Answer

Neither A nor B

Question 9

Normally, the length to diameter ratio of rotary dryers varies form 4 to 10 and for its economic operation, the number of transfer units (NTU) for such dryers varies from

Accepted Answer

1.5-2.5

Answer

3.5-5.5

Answer

7.5-10.0

Answer

10-15