Process Equipment and Plant Design MCQs

Question 1

In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower.

Accepted Answer

All of the above

Answer

Molal flow rate of vapour

Answer

Vapour molecular weight

Answer

Pressure and temperature

Question 2

The raio, (properller agitator dia/tank dia) is normally taken as

Accepted Answer

0.15-030

Answer

0.5-0.65

Answer

0.75-0.85

Answer

0.60-0.90

Question 3

Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate?

Accepted Answer

Triangular pitch

Answer

Square pitch

Answer

Diagonal square pitch

Answer

Heat transfer rate is independent of tube arrangement

Question 4

Liquid gradient over a tray can be minimised by

Accepted Answer

All of the above

Answer

Providing a higher skirt clearance or a higher weir

Answer

Decreasing the number of rows of caps through which the liquid flows or by decreasing the velocity of liquid flow past the caps or by reducing the distance along the tray through which the liquid must flow

Answer

Using split flow, radial flow or cascade flow for column diameter large than 4 ft

Question 5

With increase in pressure drop (for a given particle size), the dust collection efficiency of a cyclone separator will

Accepted Answer

Increase

Answer

Decrease

Answer

Remain unaffected

Answer

Increase or decrease depending on the nature of the dust

Question 6

Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about __________ mm Hg (referred to a 760 mm mercury barometer).

Accepted Answer

650

Answer

250

Answer

450

Answer

750

Question 7

Speed of the drum of the rotary vacuum filter normally ranges from __________ rpm.

Accepted Answer

0.1 to 2

Answer

5 to 7

Answer

3 to 8

Answer

8 to 15

Question 8

Spherical shaped pressure vessel is considered to be the most ideal, because it can

Accepted Answer

Withstand higher pressure for a given metallic shell thickness

Answer

Be fabricated very easily

Answer

Be designed without wind load considerations

Answer

Be supported very easily

Question 9

Any shell opening greater than 5 cms for a storage tank must be reinforced for reason of

Accepted Answer

Preventing the local overstressing of the shell around the opening

Answer

Reduction of discontinuity in shape at the junction

Answer

Making the joint leak proof

Answer

None of these