In order to maintain contact with the immediate roof, laggings are put with the cross-bars. The norms of putting such laggings is
A. one for every meter length of bar
B. three for every meter length of bar
C. five for every meter length of bar
D. no such stipulation
Answer: Option A
This Question Belongs to Mining Engineering >> Rock Mechanics And Roof Supporting
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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
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