Mechanical Operations MCQs

Question 1

Pick out the correct statement.

Accepted Answer

A hopper is a small bin with a sloping bottom

Answer

Angle of repose is always greater than the angle of slide

Answer

A silo is a short height vessel of very large diameter used for the storage of high volatile matter coal

Answer

Pine oil is used as a 'modifying agent' (for activating or depressing the adsorption of filming agents) in froth floatation process

Question 2

Pick out the wrong statement:

Accepted Answer

Reduction ratio in crushing operation is defined as the ratio of minimum feed size to the maximum product size

Answer

Magnetic separation method can be employed to treat both dry & wet ores

Answer

Gyratory crusher is used for coarse crushing

Answer

Screens are of stationary, moving and vibratory types

Question 3

Which of the following comes in the category of primary crusher for hard and tough stone?

Accepted Answer

Jaw crusher

Answer

Cone crusher

Answer

Gyratory crusher

Answer

None of these

Question 4

Dust laden air can be purified using a

Accepted Answer

Cyclone separator

Answer

Bag filter

Answer

Gravity settler

Answer

Tubular centrifuge

Question 5

A compressible cake has the

Accepted Answer

Maximum porosity at the upstream side

Answer

Maximum porosity at the filter medium

Answer

Same porosity throughout the cake thickness

Answer

None of these

Question 6

The filtrate flow rate in constant pressure filtration

Accepted Answer

Continuously decreases

Answer

Continuously increases

Answer

Remains constant throughout

Answer

May increase or decrease ; depends on the pressure

Question 7

For benefication of iron ore, the most commonly used method is

Accepted Answer

Jigging & tabling

Answer

Flocculation

Answer

Froth floatation

Answer

None of these

Question 8

Vacuum is applied in __________ zone, in case of a general type continuous rotary drum vacuum filter.

Accepted Answer

All of the above

Answer

Filtering

Answer

Washing

Answer

Drying

Question 9

For a cyclone of diameter 0.2 m with a tangential velocity of 15 m/s at the wall, the separation factor is

Accepted Answer

230

Answer

2250

Answer

1125

Answer

460