Process Equipment and Plant Design MCQs

Question 1

A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

Accepted Answer

Both B & C

Answer

Is economical in operation

Answer

Employs high velocity, high heat transfer rate and less heating surface requirement

Answer

Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle

Question 2

Bubble cap tray is the most commonly used tray in large distillation column, because

Accepted Answer

Of its flexibility and nearly constant efficiency under varying conditions of operation

Answer

It incurs less pressure drop as compared to any other try designed for the same duty

Answer

It eliminates the foaming and entrain-ment tendency during operation

Answer

None of these

Question 3

The buckling tendency of compression members is always in the direction of the

Accepted Answer

Least radius of gyration

Answer

Axis of the load

Answer

Perpendicular to the axis of the load

Answer

None of these

Question 4

Two iron pipes of the same nominal diameter but different schedule numbers will have the same

Accepted Answer

Inside diameter

Answer

Outside diameter

Answer

Wall thickness

Answer

None of these

Question 5

The practical representative values of HETP for a number of commercial operations lies within a range of __________ metre.

Accepted Answer

0.4-0.9

Answer

0.1-0.2

Answer

0.2-0.5

Answer

1.2-1.5

Question 6

Wind load consideration in the design of a support can be neglected, when the vessel is

Accepted Answer

Short (< 2 m) and housed indoor

Answer

Tall (say 30 metres), but is full of liquid

Answer

Tall but empty

Answer

None of these

Question 7

What is the value of 'q' for saturated liquid feed to a distillation column?

Accepted Answer

1

Answer

0

Answer

<1

Answer

>1

Question 8

In packed absorption tower, onset of flooding usually occurs at a pressure drop of about __________ mm of water column per metre height of packing.

Accepted Answer

50-75

Answer

25-50

Answer

200-250

Answer

750-1000

Question 9

In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area.

Accepted Answer

2.5 to 4.0

Answer

0.5 to 1.5

Answer

5 to 10

Answer

10 to 15