Mechanical Operations MCQs

Question 1

Size reduction of asbestos and mica is done by

Accepted Answer

Hammer mills

Answer

Rod mills

Answer

Gyratory crushers

Answer

Crushing rolls

Question 2

The main differentiation factor between tube mill and ball mill is the

Accepted Answer

Length to diameter ratio

Answer

Size of the grinding media

Answer

Final product size

Answer

Operating speed

Question 3

__________ mill is normally used for grinding of talc.

Accepted Answer

Ring-roll

Answer

Tube

Answer

Compartment

Answer

Pebble

Question 4

Screen capacity is expressed in terms of

Accepted Answer

Tons/hr-ft 2

Answer

Tons/hr

Answer

Tons/ft 2

Answer

Both A & B

Question 5

In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the __________ crushing.

Accepted Answer

Primary

Answer

Secondary

Answer

Fine

Answer

Ultrafine

Question 6

Reciprocating screens are normally inclined at an angle of 5° with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the screening of the

Accepted Answer

Heavy tonnages of rocks or gravel

Answer

Light metal powder down upto 4 meshsize

Answer

Dry chemicals

Answer

Powdered food & granular materials

Question 7

Gold ore concentration is mostly done using

Accepted Answer

Tabling

Answer

Jigging

Answer

Froth floatation

Answer

Elutriation

Question 8

Feed size of ≥ 25 cms can be accepted by

Accepted Answer

Jaw crusher

Answer

Ball mill

Answer

Rod mill

Answer

Fluid energy mill

Question 9

Colloid mills achieve size reduction mainly by

Accepted Answer

Attrition

Answer

Impact

Answer

Cutting

Answer

Compression