Chemical Engineering Basics MCQs

Question 1

Pick out the wrong statement.

Accepted Answer

Pure copper electrodes are used as anode for electro-refinning of copper

Answer

In Parke's process, zinc is added to remove silver from lead

Answer

In the Pidgeon process of producing magnesium, powdered ferro-silcon is used as the reducing agent

Answer

Molten lead is used for shock cooling of the zinc vapours in the zinc blast furnace

Question 2

The bank of tubes located at the back of the domestic refrigerators are the __________ tubes.

Accepted Answer

Condenser

Answer

Refrigerant cooling

Answer

Evaporator

Answer

Throttling

Question 3

A reduction in thermal resistance during heat transfer does not occur in the

Accepted Answer

Radiation heat transfer by increasing the temperature and reducing the emis-sivity

Answer

Convection heat transfer by stirring the fluid and cleaning the heating surface

Answer

Conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity

Answer

None of these

Question 4

As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 metres from the source of noise.

Accepted Answer

85

Answer

110

Answer

60

Answer

45

Question 5

The following type of bonding is strongly directional in solids.

Accepted Answer

Covalant

Answer

Vander Waal's

Answer

Ionic

Answer

Metallic

Question 6

The temperature at which ferromagnetic material can no longer be magnetised by the outside forces, is termed as the

Accepted Answer

Curie temperature

Answer

Critical point

Answer

Inversion temperature

Answer

Eutectic temperature

Question 7

Non-ferrous alloys used for making cutting tools need not have high

Accepted Answer

Toughness

Answer

Abrasion resistance

Answer

Red hardness

Answer

Cutting speed

Question 8

The gases used in the treatment of asthma is a mixture of __________ and oxygen.

Accepted Answer

Helium

Answer

Argon

Answer

Neon

Answer

None of these

Question 9

Magnetic permeability of iron is increased by its

Accepted Answer

Alloying with cobalt

Answer

Decarburising

Answer

Purification

Answer

Alternate heating & cooling