Introduction To Mining Engineering - Study Mode

[#326] V.C.R is a modified version of
Correct Answer

(A) sub-level

[#327] A surface miner with 2.0 m cutting drum width excavates coal in windrowing mode from a bench with effective face length 200 m. The cutting speed of the surface miner is 10 m/min and the cutting depth 25 cm. The density of coal is 1.4 tonne/m 3 . If the average turning time of the machine at the face end is 5 min, the rate of production in tonne/hour becomes
Correct Answer

(B) 350

[#328] The Draw point spacing in caving method is dependent on
Correct Answer

(D) size of the ore broken

[#329] Water spraying at coalface before & after short firing is mandatory, why so?
Correct Answer

(A) in order to guard against the explosion hazard of coal dust

[#330] In which of the following thick seam mining method, roof sag and initiation of spon heating is maximum seen?
Correct Answer

(B) ascending slicing