Chemical Engineering Basics MCQs

Question 1

The normal stress is the same in all directions at a point in a fluid, only when the fluid

Accepted Answer

Is incompressible & frictionless

Answer

Is at rest & has zero viscosity

Answer

Is frictionless

Answer

Fluid layer has no motion relative to an adjacent layer of fluid

Question 2

Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50 wt% B is

Accepted Answer

R ln 2

Answer

-R ln 2

Answer

3R ln 2

Answer

-3R ln 2

Question 3

__________ of test specimens is not involved in any hardness testing method.

Accepted Answer

Fracture

Answer

Indentation

Answer

Wear

Answer

Scratch

Question 4

The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as

Accepted Answer

Ductile

Answer

Rigid

Answer

Tough

Answer

Plastic

Question 5

Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.

Accepted Answer

10

Answer

1

Answer

30

Answer

45

Question 6

Joule-Thomson co-efficient is the ratio of

Accepted Answer

Temperature change to pressure change occuring during adiabatic throttling of a gas

Answer

Pressure change to temperature change occuring during adiabatic compression of a gas

Answer

Pressure change to temperature change occuring during adiabatic throttling of a gas

Answer

Temperature change to pressure change occuring during adiabatic compression of a gas

Question 7

Percentage of argon (by volume) in dry atmospheric air is about

Accepted Answer

0.94

Answer

0.09

Answer

0.3

Answer

0.57

Question 8

Iron has got __________ isotopes.

Accepted Answer

Four

Answer

No

Answer

Three

Answer

Two

Question 9

Addition of __________ to steel does not help in improving its machinability.

Accepted Answer

Silicon

Answer

Sulphur

Answer

Lead

Answer

Phosphorous