MECHANICAL OPERATIONS QUIZ

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.

Ultrafine

Secondary

Primary

Fine

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Neither A nor B

Grinding element & the housing

Feed particles

Both A & B

TRUE ANSWER : ?
YOUR ANSWER : ?

In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing.

Primary

Ultrafine

Secondary

Fine

TRUE ANSWER : ?
YOUR ANSWER : ?

Maximum size reduction in a fluid energy mill is achieved by

Cutting

Interparticle attrition

Impact

Compression

TRUE ANSWER : ?
YOUR ANSWER : ?

Tabular bowl centrifuges as compared to disk bowl centrifuges

Can not be operated under pressure/vacuum

Can't be used for separation of fine suspended solids from a liquid

Operate at higher speed

Employ bowl of larger diameter

TRUE ANSWER : ?
YOUR ANSWER : ?

Size reduction mechanism used in Jaw crushers is

Impact

Attrition

Compression

Cutting

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Wettability

None of these

Specific gravities

Shape

TRUE ANSWER : ?
YOUR ANSWER : ?

Mixing of plastic solids is generally facilitated by

None of these

Dispersion

Mastication

Kneading

TRUE ANSWER : ?
YOUR ANSWER : ?

Bucket elevators are not suitable for the vertical lifting of __________ materials.

Free flowing

Fine (e.g. - 200 mesh size coal)

Sticky (e.g. clay paste)

Small lumpy (e.g. grains and sand)

TRUE ANSWER : ?
YOUR ANSWER : ?

Cartridge filters are termed as 'edge' filters, because of the fact that the

Solids are not deposited at the edge of the disk

Bulk of the solids are removed at the periphery of the disks

None of these

Disks have very sharp edge

TRUE ANSWER : ?
YOUR ANSWER : ?

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