Mechanical Operations MCQs

Question 1

For the preliminary breaking of hard rock, we use a

Accepted Answer

Gyratory crusher

Answer

Ball mill

Answer

Tube mill

Answer

Squirrel-cage disintegrator

Question 2

A widely used size reduction equipment for __________ is Bradford breaker.

Accepted Answer

Coal

Answer

Talc

Answer

Iron core

Answer

Wheat

Question 3

The inlet pressure in a constant rate filtration

Accepted Answer

Increases continuously

Answer

Decreases gradually

Answer

Remains constant

Answer

None of these

Question 4

Balls for ball mills are never made of

Accepted Answer

Lead

Answer

Forged/cast steel

Answer

Cast iron

Answer

Alloy steel

Question 5

During agitation of liquids, the

Accepted Answer

All of the above

Answer

Froude number is independent for the curves between power number and Reynolds number in baffled system

Answer

Power number becomes independent of impellers Reynolds number at high Reynolds number, but is dependent on the geometry of the impeller

Answer

Froude number is used to account for the effect of surface (e.g., the centre vortex) on the power number

Question 6

Which of the following achieves the least reduction ratio for a given feed size?

Accepted Answer

Roll crusher

Answer

Jaw crusher

Answer

Cone crusher

Answer

Gyratory crusher

Question 7

Handling of ashes and similar materials can be done best by a __________ conveyor.

Accepted Answer

Drag or slat

Answer

Flight

Answer

Belt

Answer

Ribbon

Question 8

Which of the following is not a wet classifier?

Accepted Answer

None of these

Answer

Sharpies supercentrifuge

Answer

Hydrocyclones

Answer

Dorr Oliver rake classifier

Question 9

Which of the following is a batch sedimentation equipment?

Accepted Answer

Filter thickener

Answer

Dust catcher

Answer

Dry cyclone separator

Answer

Rotary sprayer scrubber