Which of the following is not a contributory factor for the cause of the subsidence?
A. stowing is not done
B. depth of cover is more
C. friable nature of superincumbent rock
D. void is not supported effectively
Answer: Option B
This Question Belongs to Mining Engineering >> Rock Mechanics And Roof Supporting
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Which of the following is not considered in Bieniawski's geo-mechanics classification?
A. rock strength
B. RQD
C. ground water condition
D. layers thickness
What is the expected range of LBC of a 2.5 m long, 15 cm diameter timber prop?
A. 5 - 10 KN
B. 15 - 20 KN
C. 50 - 60 KN
D. 120 - 130 KN
A. point load test
B. servocontrolled test
C. displacement test
D. post peak test
A. 1.25
B. 1.50
C. 2.25
D. 1.00
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