MECHANICAL OPERATIONS QUIZ

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

Gyratory crusher

Ball mill

Roll crusher

Hammer crusher

TRUE ANSWER : ?
YOUR ANSWER : ?

Reduction ratio of crushers is the

None of these

Ratio of feed opening to discharge opening

Ratio of discharge opening to feed opening

Determining factor for minimum dia of the feed and the product

TRUE ANSWER : ?
YOUR ANSWER : ?

Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called

Clarification

Froth floatation

Classification

Thickening

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

0.5

0.66

2.76

TRUE ANSWER : ?
YOUR ANSWER : ?

In a roll crusher, both the rolls

Have the same diameter

Run either at the same or different speeds

Are rotated towards each other

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a __________ conveyor.

Drag

Slat

Screw

Ribbon

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following gives the crushing energy required to create new surface ?

None of these

Fick's law

Taggarts rule

Rittinger's law

TRUE ANSWER : ?
YOUR ANSWER : ?

Vertical transportation of materials can be done by a/an

Apron conveyor

Bucket elevator

Both B & C

Pneumatic conveyor

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not used as filter aid?

Asbestos

Purified wood cellulose

Rice husk

Diatomaceous earth

TRUE ANSWER : ?
YOUR ANSWER : ?

Colloidal mills are used for __________ grinding.

Intermediate

Fine

Coarse

Ultrafine

TRUE ANSWER : ?
YOUR ANSWER : ?

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