MECHANICAL OPERATIONS QUIZ

Jigging is a technique by which different particles can be

Separated by particle size

Separated by particle density

Separated by particle shape

Mixed

TRUE ANSWER : ?
YOUR ANSWER : ?

A tube mill as compared to a ball mill

Has larger length/diameter ratio (>2 as compared to 1 for ball mill)

Employs smaller balls

Gives finer size reduction but consumes more power

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The crushed material received for separation is called feed or

Concentrate

Middling

Heading

Tailing

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not an ultrafine grinder (colloid mill)?

Toothed roll crusher

Micronizers

Agitated mills and fluid energy mills

Hammer mills with internal classification

TRUE ANSWER : ?
YOUR ANSWER : ?

Ultra centrifuges are used for the separation of __________ solid particles.

Colloidal

Fine

Dissolved

Coarse

TRUE ANSWER : ?
YOUR ANSWER : ?

The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the __________ filter.

Plate & frame

Sand

Vacuum

Rotary

TRUE ANSWER : ?
YOUR ANSWER : ?

The mechanism of size reduction by a hammer mill is by impact and attrition between the

Both A & B

Neither A nor B

Grinding element & the housing

Feed particles

TRUE ANSWER : ?
YOUR ANSWER : ?

Crushing of mineral particles is accomplished in a 'cage mill', when one or more alloy steel bars are revolved in opposite directions. It is a type of __________ mill.

None of these

Vibratory

Roll

Impact

TRUE ANSWER : ?
YOUR ANSWER : ?

The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an

Bag filter

Wet scrubber

Electrostatic precipitator

Cyclone separator

TRUE ANSWER : ?
YOUR ANSWER : ?

The process opposite to 'dispersion' is termed as the

Flocculation

Filtration

None of these

Sedimentation

TRUE ANSWER : ?
YOUR ANSWER : ?

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