Mechanical Operations
In screen analysis, the notation +5 mm/-10 mm means particles passing through

Both 5 mm and 10 mm screens
10 mm screen and retained on 5 mm screen
Neither 5 mm nor 10 mm screen
5 mm screen and retained on 10 mm screen

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Mechanical Operations
Pick out the wrong statement pertaining to the roll crushers.

For hard material's crushing, the reduction ratio should not exceed 4
Maximum feed size determines the required roll diameter
Both the rolls run necessarily at the same speed
Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced

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