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Mechanical Operations

Mechanical Operations
Which of the following may prove unsuitable for filtering volatile liquids?

Vacuum filter
Gravity filter
Centrifugal filter
Pressure filter

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Mechanical Operations
Froth floatation is the most suitable for treating

Quartzite
Sulphide ores
None of these
Iron ores

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Mechanical Operations
Colloidal mills are used for __________ grinding.

Ultrafine
Coarse
Intermediate
Fine

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Mechanical Operations
Sphericity of raschig ring (whose length and diameter are equal) is

1
2
>1

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Mechanical Operations
Helical screw agitator is used for

Mixing highly viscous pastes
Blending immiscible liquids
None of these
Mixing liquids at very high temperature (> 250 °C)

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

Roll crusher
Gyratory crusher
Hammer crusher
Ball mill

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