Chemical Engineering Basics MCQs

Question 1

Which of the following is the most suitable for removing fine particles (< 1 micron diameter) from air below its dew point?

Accepted Answer

Electrostatic precipitator

Answer

Venturi scrubber

Answer

Cyclone separator

Answer

Fabric filter

Question 2

Volute casing of a centrifugal pump does not facilitate

Accepted Answer

Conversion of the part of the pressure head to velocity head

Answer

Uniform flow of fluid coming out of the impeller

Answer

Increase in the pump efficiency

Answer

Conversion of the part of the velocity head to the pressure head

Question 3

Function of gear box is to

Accepted Answer

Obtain variable speed

Answer

Reduce the speed

Answer

Increase the speed

Answer

Produce high torque

Question 4

Function of fusible plug in a boiler is to

Accepted Answer

Put off fire in the furnace when water level in the boiler falls to unsafe limit

Answer

Drain out water and sludge from the boiler during repair

Answer

Guard the boiler in case of abnormal rise in steam pressure

Answer

All of the above

Question 5

Co-efficient of performance of a Carnot cycle refrigerator operating between - 23°C and + 27°C is

Accepted Answer

5

Answer

3

Answer

0.5

Answer

1.5

Question 6

Which of the following gases cause global warming?

Accepted Answer

Carbon dioxide

Answer

Carbon monoxide

Answer

Nitrogen

Answer

Ozone

Question 7

Principal alloying element in Elinvar (used for making hair springs for watches) is

Accepted Answer

Nickel

Answer

Copper

Answer

Aluminium

Answer

Zinc

Question 8

The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process?

Accepted Answer

Cyaniding

Answer

Sheardising

Answer

Spherodising

Answer

None of these

Question 9

The life of a ball bearing is inversely proportional to

Accepted Answer

(load)3

Answer

(load)1

Answer

(load)2

Answer

(load)0.33