21.
Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid?

22.
Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid?

23.
Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?

25.
Pick out the wrong statement.

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