Mechanical Operations
In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called __________ is produced.

Middling
None of these
Concentrate
Tailing

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Mechanical Operations
In case of a hammer crusher,

All of these
Reduction ratio can be varied by adjusting the distance from cage to hammers
Crushing takes place by impact breaking
Maximum acceptable feed size is 30 cms

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