Mechanical Operations
Which of the following is not an ultrafine grinder (colloid mill)?

Hammer mills with internal classification
Micronizers
Toothed roll crusher
Agitated mills and fluid energy mills

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Mechanical Operations
Reciprocating screens are normally inclined at an angle of 5° with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the screening of the

Dry chemicals
Powdered food & granular materials
Heavy tonnages of rocks or gravel
Light metal powder down upto 4 meshsize

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