HERE THE QUESTIONS FOR YOU MINING ENGINEERS (Q1 to Q10) AND
(ANSWERS ARE BELOW THE QUESTIONS)
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Q1)
The discharge velocity of the sand in pneumatic sand stowing?
1) 2 m/s
2) 10 m/s
3) 15 m/s
4) 20 m/s
Q2)
The stowing rate in Mechanical sand stowing?
1) 50-60 tph
2) 60-70 tph
3) 70-80 tph
4) 80-90 tph
Q3)
There was no movement at the surface untill the face advances upto....m?
1) 15m
2) 22m
3) 30m
4) 35m,2
Q4)
The face must advance by approximately a distance of ....times the depth of the seam for the full subsidence
to take place?
1) 1.4
2) 1.8
3) 2.5
4) 3
Q5)
The angle of inclination from vertical of the line connecting the edge of the workings and the edge of the
subsidence area is called?
1) Angle of fracture
2) Angle of draw
3) Breaking angle
4) hade
Q6)
If the full subsidence is occured more than one point then the subsidence is called?
1) critical
subsidence
2) subcritical subsidence
3) supercritical subsidence
4) trough subsidence
Q7)
The angle of draw in indian coal fields?
1) upto 25 deg
2) upto 35 deg
3) upto 40 deg
4) upto 45 deg
Q8)
With hydraulic sand stowing of the goaf the subsidence can be reduced to about ....of the amount caused by
caving?
1) 1/2
2) 1/3
3) 1/4
4) 1/5
Q9)
The critical width of extraction at which the subsidence at the bottom of the trough has a maxmimum possible
value is?
1) equal to depth
2) 1.3 X depth
3) 1.8 X depth
4) 2 X depth
Q10)
The minimum thickness of the coal seam for adopting Bord and pillar method of mining?
1) 1.0 m
2) 1.5 m
3) 2.0
m
4) 2.5 m
ANSWERS FOR ABOVE QUESTIONS
Q1) 3 Q2) 1 Q3) 2 Q4) 1 Q5) 2
Q6) 3 Q7) 2 Q8) 4 Q9) 2 Q10) 2
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