31. 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
| 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 |
32. 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
33. 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
34. The delay interval in short delay detonator is
35. What is the name of the media through which coal pulp in hydraulic mining is sent from face to pulp sump or coal crusher?
36. Shale as immediate roof in underground, coal mine is not suitable because
37. Blasting of stope in VCR method consists of
38. Which one of tire following HEMM is a tyre mounted?
39. In an opencast mine shown in the figure below, the coal has a density of 1.4 t/m3. Assuming mining operation started from plane XY, the operating stripping ratio under the given conditions in m3/t is
40. Manhole should be provided along the haulage length at every "A" meter distance. A is given by
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