Mechanical Operations MCQs

Question 1

Chance process is used for the

Accepted Answer

Cleaning of coal

Answer

Concentration of iron ore

Answer

Concentration of pyrites

Answer

Water treatment

Question 2

Optimum ratio of operating speed to critical speed of a trommel is

Accepted Answer

0.33-0.45

Answer

1.33-1.45

Answer

0.5-2

Answer

1.5-2.5

Question 3

Crushing of mineral particles is accomplished in a 'cage mill', when one or more alloy steel bars are revolved in opposite directions. It is a type of __________ mill.

Accepted Answer

Impact

Answer

Roll

Answer

Vibratory

Answer

None of these

Question 4

Solid particles of different densities are separated by

Accepted Answer

Sorting classifier

Answer

Filters

Answer

Thickness

Answer

Cyclones

Question 5

Separation of solid particles based on their densities is called

Accepted Answer

Sorting

Answer

Sizing

Answer

Clarification

Answer

Dispersion

Question 6

A pebble mill

Accepted Answer

Both B and C

Answer

Is a ball mill

Answer

Employs flints or ceramic pebbles as the grinding medium

Answer

Is a tube mill lined with ceramic or other non-metallic liner

Question 7

In a roll crusher, the specific power consumption and the production rate is affected by the

Accepted Answer

Both A & B

Answer

Reduction ratio

Answer

Differential roll speed

Answer

Neither A nor B

Question 8

Sphericity of raschig ring (whose length and diameter are equal) is

Accepted Answer

1

Answer

>1

Answer

<1

Answer

2

Question 9

The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant __________ filtration.

Accepted Answer

Both A & B

Answer

Rate

Answer

Pressure

Answer

Neither A nor B