Chemical Engineering Basics MCQs

Question 1

The ratio of the shear stress to the principal stress on a principal plane is

Accepted Answer

0

Answer

1

Answer

$$\frac{1}{2}$$

Answer

$$\frac{1}{3}$$

Question 2

In electrical resistance welding, distortion results from the use of improper

Accepted Answer

Clamping methods

Answer

Electrodes

Answer

Current

Answer

Filler material

Question 3

With increase in pressure, the latent heat of steam

Accepted Answer

Decreases

Answer

Increases

Answer

Remains unchanged

Answer

Data insufficient; can't be predicted

Question 4

Oxide layer formed on the non-ferrous metal surface after its annealing is

Accepted Answer

Removed by acid pickling

Answer

Hammered into the surface

Answer

Removed with coarse emery cloth

Answer

Left as such to protect the surface

Question 5

Solidification time of a molten metal in a casting is proportional to (where, V = volume of metal & A = its surface area; in the casting)

Accepted Answer

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

Answer

$$\frac{{	ext{V}}}{{	ext{A}}}$$

Answer

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

Answer

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

Question 6

Surface tension of a liquid

Accepted Answer

All of the above

Answer

Is due to intermolecular forces of cohesion

Answer

Decreases with rise in temperature

Answer

Is responsible for the spherical shape of an isolated liquid drop

Question 7

__________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C.

Accepted Answer

Supermax

Answer

Borosilicate

Answer

High silica

Answer

Lead

Question 8

Which of the following is not a suitable solid lubricant?

Accepted Answer

None of these

Answer

Talc

Answer

Molybdenum disulphide

Answer

Graphite

Question 9

Diamond does not conduct electricity, because

Accepted Answer

No free electrons are present

Answer

Its structure is very compact

Answer

It is of crystalline nature

Answer

There are only carbon atoms present