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Rock Mechanics and Roof Supporting MCQs Questions & Answers | Mining Engineering

Learn and practice multiple-choice questions (MCQs) with answers related to Rock Mechanics and Roof Supporting. These resources are available for mining engineering students who wish to clear GATE exams, technical interviews, competitive examinations, and other entrance exams. The Rock Mechanics and Roof Supporting chapter is particularly important for students studying mining engineering. Page-2 section-1

11
The rock mass classification system that considers 'active stress' factor is
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Answer: Option A
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12
The rock specimen obtained from the overlying strata in a coal mine were tested in uni-axial compression and the following results were obtained at 50% of average compressive strength
Longitudinal strain = 0.06 and Lateral strain = 0.012
The ratio of vertical to horizontal stress in the mine is
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Answer: Option B
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13
A rock specimen of average thickness 0.8 cm failed at an applied load of 1000 kg during determination of shear strength by the punch test. The diameter of the punch is 2.8 cm, The shear strength of the rock specimen in kg/ cm2 is
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Answer: Option B
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14
Rock mass parameters for a shale rock, mb, s, and a of the Hoek and Brown failure criterion as given in the equation are 2.4, 0.01 and 0.52 respectively. The uni-axial compressive strength (σCi) of intact sh!le is 50 MPa.
$${\sigma _1} = {\sigma _3} + {\sigma _{ci}}{\left( {{m_b}\frac{{{\sigma _3}}}{{{\sigma _{ci}}}} + S} \right)^a}$$
The global rock mass strength of shale in MPa is
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Answer: Option B
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15
Below mentioned are some features or cases of roof bolting. Identify one of such case where use of roof bolting may be ineffective?
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Answer: Option D
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16
From the stress-strain diagram shown below, the tangent and the secant moduli of elasticity in GPa are
Rock Mechanics and Roof Supporting mcq question image
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Answer: Option A
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17
The grain size distribution of soil is known as
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Answer: Option D
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18
Chimney caving involves the progressive migration of an unsupported mining activity and the sudden mode of formation rather than progressive one is known as
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Answer: Option D
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19
Name the diagram where the strikes of discontinuities are oriented at about 5° interval?
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Answer: Option D
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20
In the Mohr's scale of hardness, the minerals in increasing sequence of hardness are
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Answer: Option D
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