MECHANICAL OPERATIONS QUIZ

Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)

2 D

0.5 D

1.5 D

D

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Which one is a filter aid?

Convas fabric

Calcined lime

None of these

Diatomaceous earth

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Size reduction of asbestos and mica is done by

Hammer mills

Crushing rolls

Rod mills

Gyratory crushers

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

Thickening

Clarification

Froth floatation

Classification

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Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their

Terminal velocities

Particle sizes

None of these

Densities

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The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the __________ filter.

Vacuum

Rotary

Sand

Plate & frame

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Grinding characteristic of a material is given by its

HGI

Abrasion index

Shatter index

Angle of repose

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According to Taggart's rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than

0.00184

0.184

1.84

0.0184

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

Feed rate

All of these

Rotor speed

Clearance between hammer & grinding plates

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Two particles are called to be equal settling, if they are having the same.

Specific gravity

None of these

Size

Terminal velocities in the same fluid & in the same field of force

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