Chemical Engineering Basics MCQs

Question 1

A material is capable of resisting softening at high temperature, because of its property termed as

Accepted Answer

Hot hardness

Answer

Hot temper

Answer

Fatigue

Answer

Creep

Question 2

Austenite is not

Accepted Answer

Magnetic

Answer

Ductile

Answer

Malleable

Answer

Soft

Question 3

In the acid Bessemer process, the hot metal should have the following com-positon.

Accepted Answer

S < 0.05% and P < 0.05%

Answer

S < 0.05% and P < 1.5%

Answer

S 1.5%

Answer

S > 1.5% and P < 0.05%

Question 4

During decarburising of a plain carbon steel, the thickness of ferrite layer growth is proportional to

Accepted Answer

Square root of time

Answer

Time

Answer

Square of time

Answer

Cube of time

Question 5

Brazing is the joining of metals

Accepted Answer

Both A & B

Answer

Without melting the base metal

Answer

With a non-ferrous filler

Answer

Neither A nor B

Question 6

When water is sprayed on air, passing through an insulated chamber maintained at a temperature higher than the dew point of entering air but lower than its dry bulb temperature, then the air is

Accepted Answer

Cooled and humidified

Answer

Cooled and dehumified

Answer

Heated and humidified

Answer

Heated and dehumidified

Question 7

Water-tube boiler is the one, in which

Accepted Answer

Water passes through tubes and flue gases around it

Answer

Tube carrying hot flue gases are immersed in a pool of water

Answer

Tubes are placed in vertical position

Answer

None of these

Question 8

The expected efficiency of a single rivetted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times.

Accepted Answer

Two

Answer

Four

Answer

Six

Answer

Eight

Question 9

Resilience of a bolt can be increased by increasing its

Accepted Answer

Length

Answer

Shank diameter

Answer

Head diameter

Answer

None of these