Diamond drill bit is rotated at a speed of nearly
A. 200 rpm
B. 250 rpm
C. 300 rpm
D. 400 rpm
Answer: Option C
This Question Belongs to Mining Engineering >> Coal Mining
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
Join The Discussion