On the mixing cone, there is a screen to prevent pebbles larger than . . . . . . . . mm size from getting into shaft range with sand water mixing.
A. 10mm
B. 15mm
C. 20mm
D. 25mm
Answer: Option D
Related Questions on Coal Mining
The required water for 1 ton of sand in hydraulic sand stowing is . . . . . . . .
A. 800 l
B. 600 l
C. 1100 l
D. 1200 l
Scaffold not required in . . . . . . . . tubbing
A. Over hung tubby
B. Under hung
C. Brick
D. Concrete
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