MECHANICAL OPERATIONS QUIZ

The crushed material received for separation is called feed or

Tailing

Middling

Concentrate

Heading

TRUE ANSWER : ?
YOUR ANSWER : ?

Mixing of light fine powder such as insecticides is done by

Banbery mixer

Kneader

Impact wheels

Pug mill

TRUE ANSWER : ?
YOUR ANSWER : ?

Size reduction of asbestos and mica is done by

Rod mills

Hammer mills

Crushing rolls

Gyratory crushers

TRUE ANSWER : ?
YOUR ANSWER : ?

Trommels are revolving screens which normally operate in the range of __________ rpm.

43832

15 - 20

60 - 75

40 - 50

TRUE ANSWER : ?
YOUR ANSWER : ?

The specific surface of sherical particles is proportional to (where, Dp = diameter of particle).

1/Dp

1/D²p

D²p

Dp

TRUE ANSWER : ?
YOUR ANSWER : ?

Ore concentration by jigging is based on the difference in the __________ of the particles.

Shape

None of these

Specific gravities

Wettability

TRUE ANSWER : ?
YOUR ANSWER : ?

The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).

None of these

Dp/Df

Df - Dp

Df/Dp

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is a continuous filter?

Cartridge filter

Plate and frame filter

None of these

Shell and leaf filter

TRUE ANSWER : ?
YOUR ANSWER : ?

A pebble mill

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

Is a ball mill

Both B and C

Employs flints or ceramic pebbles as the grinding medium

TRUE ANSWER : ?
YOUR ANSWER : ?

What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls?

1

2.76

0.66

0.5

TRUE ANSWER : ?
YOUR ANSWER : ?

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