Coal Mining - Study Mode
[#411] In a seam with loco haulage system the junctions with main haulage are staggered.
Correct Answer
(B) Roof exposure to minimise
[#412] Limiting gradient for longwall mining.
Correct Answer
(C) 1 in 3
[#413] The sudden release of elastic strain energy stores in pillars which results violent burst of coal pillars called
Correct Answer
(B) Bumps
[#414] Width of workings from goaf line of face . . . . . . . .
Correct Answer
(A) Span
[#415] The purpose of treatment of holes with chemicals silicate of soda and alluminium sulphate is to reduce
Correct Answer
(B) Friction