Introduction To Mining Engineering - Study Mode
[#156] As per the Indian Electricity Rules 1956. the maximum permissible length of a flexible cable used with any portable or transportable apparatus in mine is
Correct Answer
(A) 100
[#157] Commercial coal reserve is
Correct Answer
(D) less than workable reserve
[#158] Which type of ventilation is preferred for hot and deep mines?
Correct Answer
(B) descensional
[#159] In block caving operation the draw points are placed at 20 m centre to centre, with the pillar width 3.5 m as shown in figure below. The muck is assumed to have zero cohesion and 35 friction angle. The height of draw cone (h) in m is
Correct Answer
(C) 15.8
[#160] What should be the water requirement in hydraulic mining method, if the dip of the seam is more than 45°?
Correct Answer
(A) 1 m 3 /ton of coal