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Mechanical Operations

Mechanical Operations
Which of the following is a coarse crusher?

Gyratory crusher
Smooth roll crusher
Toothed roll crusher
Tube mill

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Mechanical Operations
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?

2.76
0.66
1
0.5

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Mechanical Operations
Pine oil used in froth floatation technique acts as a/an

Frother
Activator
Collector
Modifier

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Mechanical Operations
Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is

0.2 to 0.8
0.2 to 0.4
0.1 to 0.3
0.01 to 0.1

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

Clarification
Thickening
Froth floatation
Classification

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Mechanical Operations
Chance process is used for the

Concentration of pyrites
Water treatment
Concentration of iron ore
Cleaning of coal

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