Chemical Engineering Basics MCQs

Question 1

Pick out the wrong statement.

Accepted Answer

Tungsten steel and alnico are not hard magnetic materials

Answer

A ferromagnetic material becomes paramagnetic above the 'Curie temperature'

Answer

Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials

Answer

Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces

Question 2

Which of the following is an example of stress corrosion ?

Accepted Answer

Both (A) & (B)

Answer

Season cracking of brass

Answer

Caustic embrittlement of steel

Answer

Neither (A) nor (B)

Question 3

Which of the following is not a characteristic observed in material failure by fatigue fracture ?

Accepted Answer

Initiation of crack from below the surface does not occur

Answer

Plastic deformation of material does not occur

Answer

Initation of crack occurs on the surface of the machine part

Answer

Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface

Question 4

While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen flame is about __________ °C.

Accepted Answer

2000

Answer

1800

Answer

2400

Answer

3000

Question 5

The total frictional resistance to fluid flow does not depend upon the

Accepted Answer

Fluid pressure

Answer

Roughness of the surface

Answer

Fluid density

Answer

Fluid velocity

Question 6

Which of the following is a unit of time ?

Accepted Answer

None of these

Answer

Barn

Answer

Light year

Answer

Angstrom

Question 7

In extrusion of metals, which of the following statement is true ?

Accepted Answer

Hollow ram is used for indirect extrusion

Answer

Speed of the extruded material is same as that of ram speed

Answer

Redundant work is a function of the die angle

Answer

Relative motion between the billet surface and the container wall is always present

Question 8

__________ is the most suitable lubricant for drawing mild steel wires?

Accepted Answer

Sodium stearate

Answer

Kerosene

Answer

Water

Answer

Lime water

Question 9

Maraging steels derive their strength from the following mechanism:

Accepted Answer

A fine, highly dislocated and strong martensite

Answer

Fine dispersions of intermetallics of Fe, Ni, Ti etc

Answer

Fine dispersions of alloy carbides in a ferrite matrix

Answer

Fine dispersions of Fe3 C nucleated on dislocations in austenite