MECHANICAL OPERATIONS QUIZ

The maximum slope of a belt conveyor can be

30°

60°

45°

15°

TRUE ANSWER : ?
YOUR ANSWER : ?

Balls for ball mills are never made of

Lead

Alloy steel

Cast iron

Forged/cast steel

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is the most suitable for handling fibrous and dense slurries?

Turbine agitator

Radial propeller agitator

Propeller agitator

Cone type agitator

TRUE ANSWER : ?
YOUR ANSWER : ?

Separation of materials into products based on the difference of their sizes is called

Sizing

Classification

Flocculation

Sorting

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is used for primary crushing of very hard lumpy materials?

Ball mill

Gyratory crusher

Toothed roll crusher

Tube mill

TRUE ANSWER : ?
YOUR ANSWER : ?

The unit of specific cake resistance is

Gm/cm²

Cm/gm

Gm/gm

Cm/gm²

TRUE ANSWER : ?
YOUR ANSWER : ?

Soft & non-abrasive materials can be made into fines by

Cutting

Compression

None of these

Attrition

TRUE ANSWER : ?
YOUR ANSWER : ?

In case of a hammer crusher, the final product size depends on the

All of these

Rotor speed

Feed rate

Clearance between hammer & grinding plates

TRUE ANSWER : ?
YOUR ANSWER : ?

During the washing of cake

Cake resistance decreases

Filter medium resistance decreases

All the resistances are constant

Filter medium resistance increases

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

0.66

2.76

0.5

TRUE ANSWER : ?
YOUR ANSWER : ?

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