Chemical Engineering Basics MCQs

Question 1

Addition of __________ to steel does not impart hardness.

Accepted Answer

Copper

Answer

Nickel

Answer

Chromium

Answer

Silicon

Question 2

Pick out the wrong statement about nucleate boiling.

Accepted Answer

The temperature is less than that of film boiling

Answer

Bubble generation is by expansion of entrapped gas/vapour at small cavities in the surface

Answer

Surface temperature is greater than the saturation temperature of the liquid

Answer

Heat transfer from the surface of the liquid is less than that in film boiling

Question 3

Pick out the correct statement about the condensation.

Accepted Answer

Suitable coating or vapour additive is used to promote film wise condensation

Answer

Filmwise condensation gives a lower heat transfer rate than the dropwise condensation

Answer

If a condensing liquid does not wet the surface dropwise, even then condensation will take place on it

Answer

Reynolds number of condensing liquid is based on its mass flow rate

Question 4

Which of the following heat treatment processes is used for softening the hardened material?

Accepted Answer

Tempering

Answer

Normalising

Answer

Annealing

Answer

None of these

Question 5

Large diameter shafts are manufactured by

Accepted Answer

Forging and turning to size

Answer

Hot rolling

Answer

Cold drawing

Answer

Casting and turning to size

Question 6

Fatigue strength of a material can not be increased by

Accepted Answer

Hot working

Answer

Cold working

Answer

Shot peening

Answer

Any of these

Question 7

The ability of tool steel to resist softening at high temperatures is termed as __________ hardness.

Accepted Answer

Super

Answer

Red

Answer

Extended

Answer

Extreme

Question 8

The difference in the properties of a substance in three states of matter depends upon the

Accepted Answer

Difference in intermolecular forces

Answer

Binding energy of atoms

Answer

Difference in molecular shape

Answer

None of these

Question 9

__________ circuit is most commonly used to measure strain with the help of a strain gauge.

Accepted Answer

Voltage balancing potentiometric

Answer

Ballast

Answer

Simple current sensitive

Answer

None of these