Chemical Engineering Basics MCQs

Question 1

Pick out the wrong statement.

Accepted Answer

Invar is a magnetic alloy

Answer

Weldability of high carbon steel is poorer compared to low carbon steel

Answer

Magnetic permeability of the diamagenetic material is less than one

Answer

Martensitic transformation never goes to complection ( i.e., 100%) at room temperature

Question 2

The instrument based on the following principle is used for the measurement of oxygen only in the flue gases.

Accepted Answer

Paramagnetism

Answer

Chemical absorption

Answer

Thermal conductivity

Answer

Infrared absorption

Question 3

Colour comparator is used to measure the

Accepted Answer

pH value

Answer

Electrode potential

Answer

Colour intensity

Answer

None of these

Question 4

The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe)

Accepted Answer

$$\frac{1}{{	ext{A}}}$$

Answer

A

Answer

D

Answer

$$\frac{1}{{{{	ext{A}}^2}}}$$

Question 5

Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by

Accepted Answer

Radiation

Answer

Conduction

Answer

Convection

Answer

Both A & B

Question 6

Pearlite comprises of

Accepted Answer

87% ferrite & 13% cementite

Answer

87% cementite & 13% Fe

Answer

93.33% ferrite & 6.67% C

Answer

87% ferrite & 13% C

Question 7

Shrinkage allowance on pattern is provided to compensate for shrinkage when the

Accepted Answer

Solid phase temperature drops from freezing temperature to the room temperature

Answer

Metal changes from liquid state to solid state at freezing temperature

Answer

Liquid metal temperature drops from pouring temperature to room temperature

Answer

Liquid metal temperature drops from pouring temperature to freezing temperature

Question 8

Out of the following, the alloy which has equal percentage of constituents, is

Accepted Answer

Constanton

Answer

White metal

Answer

Gun metal

Answer

Duralumin

Question 9

Pick out the wrong statement.

Accepted Answer

Very fine grain structure is desirable for high temperature creep application of materials

Answer

Annealing twins are not observed in pure aluminium, because it has higher strain energy

Answer

Load during cold rolling can be lowered by the application of front tension

Answer

Soft magnetic materials are those which have less area within the hysterisis loop