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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-6 section-1

51
If a rock type has RMR value 70, then what will be its roof class?
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Answer & Solution
Answer: Option C
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52
The measurements of a site investigation are as follows:
In = 9, Jr = 1.5, Ja = 2.0, Jw = 1.0. SRF = 2.5. The RQD values taken from five boreholes of the area are 94.2, 95.6, 99.4, 95.3 and 98.0 respectively. The rock mass quality index (Q) is
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Answer: Option A
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53
The objective of such activity is to restrict displacements of the country rock to elastic orders of magnitude and to maintain as far as practicable the integrity of both the country rock and the unmined remnants within the ore body. Identify the mining activity?
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Answer: Option D
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54
During uniaxial compressive testing of a rock specimen of diameter 54 mm and length 120 mm, the axial strain was found to be 6.5 × 10-4 mm/mm. If the Poisson's ratio of the rock is 0.3, the volumetric strain of the rock specimen in mm/mm is
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Answer: Option B
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55
From a series of tri-axial tests conducted on some sandstone specimens, the relationship between the major and the minor principal stresses in MPa is found to be σ1 = 100 + 5 σ3. The angle of internal friction in degrees of that sandstone is
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Answer: Option C
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56
The components of state of stress at a point in x - y plane are given as σxx = 5 MPa, σyy = 10MPA and $${\tau _{xy}}$$ = 2MPa. The sum of the principal stresses acting on the x - y plane in MPa is
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Answer: Option A
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