Mine Subsidance Engineering Mid - I, September - 2014

1.The diameter of the _______increases with depth and hence their profiles may appear like bottles with caps removed.
  • Sinkhole
  • Troughs
  • Surface cracks
  • none of the above
Answer: A
2.Subsidence in board and pillar workings is
  • Regular
  • Rectilinear
  • Irregular
  • dish shaped
Answer: C
3.In which type of workings negative angle of draw has been measured
  • board & pillar workings
  • long wall workings
  • shrinkage stopping
  • none of the above
Answer: A
4.The line of fracture indicate the plane of __________
  • maximum compression
  • maximum tension
  • both a & b
  • none of the above
Answer: B
5.When draw lines plotted from the opposite side of the excavation meet above the surface. It is called
  • critical area
  • super critical area
  • sub-critical area
  • none of the above
Answer: B
6.When a full area is formed the subsidence trough is of a ________shaped form.
  • rectangular
  • square
  • plate
  • flatter dish
Answer: D
7.Exogenic activities mainly depend on the
  • Volcanism
  • folding
  • Removal of support
  • earth quakes
Answer: C
8.When draw lines are drawn from the opposite side of the excavation meet at the surface it is called
  • Partial area
  • full area
  • Super critical area
  • none of the above.
Answer: B
9.In the case of super critical area, the surface undergoes
  • Maximum vertical subsidence and the ground is free from any strains.
  • Maximum vertical subsidence and the ground in cuts maximum.
  • Maximum vertical subsidence and the ground is having maximum srain.
  • None of the above
Answer: C
10.Discontinuous subsidence are manifested as
  • Fissures
  • Pot-holes
  • Both a & b
  • none of the above
Answer: C
11.Sink holes are mainly caused by the ____________ of the mine roof.
Answer: Caving
12.______________ are dish shaped depressions at ground surface.
Answer: Troughs
13.Formation of ____________ takes place on the surface where the ground pulled is in much more than the thickness of the seam.
Answer: Pot holes (or)sink holes
14.In partial area the subsidence trough is relatively ____________________.
Answer: Narrow (or) steep sided
15.Damage to buildings are caused mainly due to ________________ developed on the surface..
Answer: Tilting or Sinkholes
16.Endogentic activities mainly depend on _____________.
Answer: Folding
17.Damage due to road ways are caused mainly due to ___________ developed on the surface.
Answer: Strain
18.The theories of continuum are used to derive information on __________ and ____________ .
Answer: Stresses and Strains
19.In mining geometry maximum subsidence occurs at ______________ of the opening.
Answer: Mid span
20.The magnitude and Extent of surface subsidence depends on ___________________.
Answer: Angle of draw