MECHANICAL OPERATIONS QUIZ

To produce talcum powder, use

Jet mill

Ball mill

Pin mill

Hammer mill

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In closed circuit grinding as compared to open circuit grinding, the

Specific surface of product is more

Production rate at a given limiting size is lower

Product has lesser size uniformity

Operation is economical

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Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the

Sedimentation

Clarification

Flocculation

Coagulation

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Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a

Sparkler filter

Sharpies supercentrifuge

Batch basket centrifuge

Disc bowl centrifuge

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Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids ( > 50000 centipoise)?

Propeller

Curved blade turbine

Flat blade turbine

Helical screw

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Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher?

Rod mill

Gyratory crusher

Ball mill

Fluid energy mill

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In a roll crusher, both the rolls

Are rotated towards each other

Run either at the same or different speeds

All of these

Have the same diameter

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Ultrafine grinders operate principally by

Cutting action

Attrition

Slow compression

Impact

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The unit of filter medium resistance is

Cm⁻¹

Gm⁻¹

Gm/cm⁻¹

Cm/gm⁻¹

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Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation?

Toggles

Check plates

Crush shaft

Jaw plates

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