Chemical Engineering Basics MCQs

Question 1

Pick out the wrong statement.

Accepted Answer

Induction hardening and flame hardening techniques are also used for surface hardening

Answer

Both annealing and normalising release the internal stresses of the material besides improving the mechanical properties

Answer

Low carbon steel does not respond to the heat treatment for hardening of the material, hence it is subjected to case hardening or surface hardening processes like cyniding, carburising, nitriding etc.

Answer

Martempering of a material is a hardening process

Question 2

Preheating before welding is done to

Accepted Answer

Prevent cold cracks

Answer

Make the plate softer

Answer

Burn oil & grease sticking to plate surfaces

Answer

Avoid plate distortion

Question 3

Fire in fuel gas pipelines is extinguished most effectively by

Accepted Answer

Blanketting the area with nitrogen atmosphere

Answer

Spraying water

Answer

Fire fighting foam

Answer

None of these

Question 4

Boiling point of water gets lowered at high altitudes (e.g., hills), because

Accepted Answer

Atmospheric pressure is low

Answer

Temperature is low

Answer

Atmospheric pressure is high

Answer

None of these

Question 5

Desert air coolers being rendered ineffective in rainy season is due to

Accepted Answer

High humidity

Answer

Low humidity

Answer

Low temperature

Answer

Sunny weather

Question 6

Auto collimator is used to check

Accepted Answer

Angle

Answer

Flatness

Answer

Rotor balancing

Answer

Roughness

Question 7

About __________ ton of coke is required in a cupola to produce one ton of casting.

Accepted Answer

0.3

Answer

0.03

Answer

0.8

Answer

1.5

Question 8

The most commonly used moderator in nuclear power plants is

Accepted Answer

Graphite

Answer

Light water

Answer

Heavy water

Answer

Berellium

Question 9

Role of a "collector" in froth floatation is to

Accepted Answer

Form a water repelling film on the mineral surface

Answer

Create and stabilise the froth

Answer

Act as a surface

Answer

Collect the minerals according to their specific gravity