Chemical Engineering Basics MCQs

Question 1

The Al2O3 content of cryolite in Hall-Heroult's cell is maintained between __________ percent.

Accepted Answer

2 - 5

Answer

18 - 20

Answer

12 - 15

Answer

6 - 12

Question 2

'End cooler' or 'after cooler' is employed in air compressor mainly to

Accepted Answer

Remove oil vapour or moisture from air

Answer

Cool the dry air before use

Answer

Reduce the volumetric capacity of receiver

Answer

None of these

Question 3

Cathodic protection is widely used in controlling corrosion in

Accepted Answer

Marine structure & underground pipelines

Answer

High pressure vessels

Answer

Overhead fuel gas pipelines

Answer

Overhead water pipelines

Question 4

The hardness of the lathe bed material is measured by the

Accepted Answer

Shore sceleroscope

Answer

Brinnel hardness tester

Answer

Vicker's hardness tester

Answer

Rockwell hardness tester

Question 5

The speed of sound will be maximum in

Accepted Answer

Metal

Answer

Vacuum

Answer

Air

Answer

Water

Question 6

The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler.

Accepted Answer

Evaporative capacity

Answer

Evaporation efficiency

Answer

Thermal efficiency

Answer

Steam load

Question 7

Two stroke engine compared to a four stroke engine has

Accepted Answer

Higher power to weight ratio

Answer

Higher efficiency

Answer

Less fuel consumption

Answer

Lower initial cost

Question 8

Steel is welded using the __________ flame.

Accepted Answer

Neutral

Answer

Carburising

Answer

Oxidising

Answer

All of the above

Question 9

Reduction reaction involves the

Accepted Answer

Gain of electrons

Answer

Loss of electrons

Answer

Increase in oxidation number

Answer

Addition of oxygen