Mechanical Operations MCQs

Question 1

In case of grinding in a ball mill

Accepted Answer

All of the above

Answer

Wet grinding achieves a finer product size than dry grinding

Answer

Its capacity decreases with increasing fineness of the products

Answer

Grinding cost and power requirement increases with increasing fineness of the products

Question 2

Ultra centrifuges are used for the separation of __________ solid particles.

Accepted Answer

Colloidal

Answer

Coarse

Answer

Fine

Answer

Dissolved

Question 3

Two particles are called to be equal settling, if they are having the same.

Accepted Answer

Terminal velocities in the same fluid & in the same field of force

Answer

Size

Answer

Specific gravity

Answer

None of these

Question 4

According to Taggart's rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than

Accepted Answer

0.0184

Answer

0.00184

Answer

0.184

Answer

1.84

Question 5

__________ mills fall in the category of tumbling mills,

Accepted Answer

All of the above

Answer

Ball and pebble

Answer

Rod and tube

Answer

Compartment

Question 6

With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge

Accepted Answer

Increases

Answer

Decreases

Answer

Remains constant

Answer

Increases linearly

Question 7

Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is

Accepted Answer

1

Answer

0.5

Answer

$$\sqrt 2 $$

Answer

$$\sqrt 3 $$

Question 8

Tank filter (e.g., Nutsch filter) is

Accepted Answer

Used for small scale filtration work

Answer

A high pressure filter

Answer

A continuous filter

Answer

A leaf filter

Question 9

The process opposite to 'dispersion' is termed as the

Accepted Answer

Flocculation

Answer

Sedimentation

Answer

Filtration

Answer

None of these