Introduction To Mining Engineering - Study Mode
[#111] Match the following, for standard diamond rods Specification Outer diameter in mm P. AW p. 34.9 Q. BW q. 44.4 R. EW r. 54.0 S. NW s. 66.7
Correct Answer
(C) P-q, Q-r, R-p, S-s
Explanation
Solution: In standard diamond rod specifications: AW corresponds to an outer diameter of 34.9 mm (P) BW corresponds to an outer diameter of 44.4 mm (Q) EW corresponds to an outer diameter of 54.0 mm (R) NW corresponds to an outer diameter of 66.7 mm (S) Matching these with the given options: Option C correctly matches: P (AW) with q (34.9 mm) Q (BW) with r (44.4 mm) R (EW) with p (54.0 mm) S (NW) with s (66.7 mm) Therefore, Option C is the correct match for the standard diamond rod specifications.
[#112] In any working below ground there should be provided at least two shaft or incline which should be away from each other by a minimum distance
Correct Answer
(B) 13.5m
[#113] A vertical ore body having a consistent width of 100 m has been excavated by the open pit method up to a depth of 100 m at a pit slope angle of 45°. The figure shows the cross section of the open pit. If the ore body is further excavated by a depth of 10 m, maintaining the same pit slope angle, the ratio of waste rock to ore is
Correct Answer
(B) 2.1
[#114] The delay interval in short delay detonator is
Correct Answer
(A) 25 ms
[#115] What is the name of the media through which coal pulp in hydraulic mining is sent from face to pulp sump or coal crusher?
Correct Answer
(C) Flumes