For drilling in stone coal drill some times used by changing the gear box to reduced the speed of bit to nearly . . . . . . . . rpm and . . . . . . . . type drill rods used.
A. 200; diamond
B. 250; turbine
C. 280; ecentric
D. None
Answer: Option B
This Question Belongs to Mining Engineering >> Mining Machinery
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Coal cutting machine ropes are . . . . . . . . wire rope core.
A. Fibre
B. Steel strand core
C. Independent wire rope
D. All
The joining of ropes is termed as . . . . . . . .
A. Rope stitching
B. Rope splicing
C. Rope Stretching
D. Rope volcanizing
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