Process Equipment and Plant Design MCQs

Question 1

Minimum baffle spacing recommended in a shell and tube heat exchanger is equal to

Accepted Answer

5 cms

Answer

40% of the I.D. of the shell

Answer

25 cms

Answer

I.D. of the shell

Question 2

The minimum plate spacing in most of the pertroleum refinery distillation columns (of dia > 3 ft) is normally __________ inches.

Accepted Answer

18

Answer

6

Answer

12

Answer

34

Question 3

Which of the following is the most common type of baffle used in industrial shell and tube heat exchanger?

Accepted Answer

25% cut segmental baffle

Answer

75% cut segmental baffle

Answer

Orifice baffle

Answer

Disk and doughnut baffle

Question 4

In a heat exchanger, shell side fluid velocity can be changed by changing the tube

Accepted Answer

Both A & B

Answer

Layout

Answer

Pitch

Answer

Neither A nor B

Question 5

In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for

Accepted Answer

Creating turbulence

Answer

Reducing scale deposition

Answer

Increasing pressure drop

Answer

Fixing the tubes

Question 6

Pick out the correct statement

Accepted Answer

Centre to centre distance between two consecutives rivets in a row is called the pitch

Answer

A rivetted joint made in overlapping plates is called butt joint

Answer

Hole size drilled in rivetted plates is less than the actual size of the rivet

Answer

None of these

Question 7

Hole diameter of the seive trays in the distillation column ranges from __________ mm.

Accepted Answer

3 to 12.5

Answer

1 to 3

Answer

4 to 8

Answer

12.5 to 18.5

Question 8

Pick out the wrong statement pertaining to 'Horton sphere' used for the storage of liquid ammonia.

Accepted Answer

Horton sphere is used for the storage of liquid at sub-zero temperature at very high pressure upto 200 kg/cm 2

Answer

Diameter of Horton sphere is normally 6 to 25 metres and it is supported by 6 to 12 nos. tubular or rolled section column

Answer

Thickness of spherical shell is half that of the cylinderical vessel under same operating pressure condition. Besides, the ratio of surface area to volume is less for sphere than any other shape ; hence insulation required is less

Answer

Horton sphere is used for the storage of gases and volatile liquid at a moderate pressure of 1 to 10 kg/cm 2

Question 9

In a multiple effect evaporator system having 'n' effects, the amount of water evaporated per unit surface area in approximately equal to __________ times that in a single effect.

Accepted Answer

$${\left( {\frac{1}{{	ext{n}}}} ight)^{{	ext{th}}}}$$

Answer

n th

Answer

0.5 n th

Answer

1.5 n th