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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-3 section-1

21
Identify from below the advantage of steel support over timber support
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Answer & Solution
Answer: Option B
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22
A core sample of 54 mm diameter having Young's modulus of 68.97 Gpa fails in uniaxial compression at 0.1% axial strain. The axial load at failure in kN is
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Answer: Option A
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23
The instrument Flat jack is used for measuring the
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Answer: Option A
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24
Correlation between the rock mass classification systems of RMR and Q is
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Answer: Option A
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25
Chockmate is used in metal mines. Which of the following coal mine support is similar to chockmate?
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Answer: Option C
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26
As per DGMS Circular 7/2002, who out of the following shall be responsible to assess the requirements of support in underground?
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Answer: Option B
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27
The uniaxial compressive strength of a limestone sample is 80 MPa. The sample is confined at a pressure of 20 MPa in a triaxial compressive strength test. Based on Hoek-Brown failure criteria the maximum principal stress at failure in MPa is
(Consider rock constants as m = 7.88, s = 1.0 and a = 0.5)
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Answer: Option D
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28
A rock specimen of 120 mm length and 54 mm diameter is subjected to uniaxial compressive loading. Two strain gauges, one axially and other radially, are attached to the specimen. At the breaking load, if these two gauges read 0.0082 m/m and 0.0023 m/m respectively, the Poisson's ratio of the specimen is
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Answer: Option C
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29
Powered support is used in
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Answer: Option B
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30
Which of the following bolting density has been prescribed for poor types of roof?
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Answer: Option C
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