MECHANICAL OPERATIONS QUIZ

A cottrel precipitator makes use of the __________ for dusty air cleaning.

Corrona discharge

Electric spark

Alternating current

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Use of 'grinding aids' is done in __________ grinding.

Intermediate

Dry

Wet

Ultrafine

TRUE ANSWER : ?
YOUR ANSWER : ?

Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill )

1/D2.5

1/D

D

D2.5

TRUE ANSWER : ?
YOUR ANSWER : ?

Coal is finally pulverised to 200 mesh size for burning in boilers by a

Hammer crusher

Ball mill

Roll crusher

Gyratory crusher

TRUE ANSWER : ?
YOUR ANSWER : ?

Size reduction of asbestos and mica is done by

Gyratory crushers

Rod mills

Crushing rolls

Hammer mills

TRUE ANSWER : ?
YOUR ANSWER : ?

The capacity of a gyratory crusher is __________ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.

10 times

5 times

Same as

2.5 times

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ mills fall in the category of tumbling mills,

Ball and pebble

Rod and tube

All of these

Compartment

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not an industrial screening equipment?

Trommel

Grizzly

Sharpies centrifuge

Vibrating screen

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Disks have very sharp edge

Solids are not deposited at the edge of the disk

None of these

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

TRUE ANSWER : ?
YOUR ANSWER : ?

Crushing efficiency of a machine ranges between __________ percent.

50 to 70

5 to 10

20 to 25

0.1 to 2

TRUE ANSWER : ?
YOUR ANSWER : ?

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