Mechanical Operations MCQs

Question 1

Cement clinker is reduced to fine size by a

Accepted Answer

Tube mill

Answer

Roll crusher

Answer

Ball mill

Answer

Hammer mill

Question 2

Which of the following is not accomplished by agitation of liquids in agitators?

Accepted Answer

Blending of immiscible liquids

Answer

Dispersing gas in liquid

Answer

Dispersing immiscible liquid in form of emulsion

Answer

Suspending solid particles

Question 3

To get a fine talc powder from its granules, the equipment used is

Accepted Answer

Ball mill

Answer

Roller crusher

Answer

Jaw crusher

Answer

Gyratory crusher

Question 4

Work index is defined as the

Accepted Answer

Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen

Answer

Energy needed to crush one tonne of feed to 200 microns

Answer

Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen

Answer

Energy needed to crush one ton of feed to 100 microns

Question 5

For raschig rings, the sphericity is

Accepted Answer

< 1

Answer

0.5

Answer

1

Answer

$$\sqrt 3 $$

Question 6

In case of a plate and frame filter press, filtrate flow through the cake follows __________ flow.

Accepted Answer

Laminar

Answer

Plug

Answer

Turbulent

Answer

None of these

Question 7

Which of the following may prove unsuitable for filtering volatile liquids?

Accepted Answer

Vacuum filter

Answer

Pressure filter

Answer

Gravity filter

Answer

Centrifugal filter

Question 8

Shell and leaf filter as compared to plate and frame filter

Accepted Answer

All of the above

Answer

Entails less labor cost

Answer

Facilitates filtration under higher pressure

Answer

Provides more effective washing

Question 9

A belt conveyor used for the transportation of materials can

Accepted Answer

All of the above

Answer

Run upto 1 km

Answer

Travel at a speed upto 300 metres/minute

Answer

Handle materials upto 5000 tons/hr