A piece of coal sample weighs 10 kg in air and 2 kg when immersed in water. The specific gravity of the coal sample is
A. 1.25
B. 1.50
C. 2.25
D. 1.00
Answer: Option A
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?
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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
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A. 1.25
B. 1.50
C. 2.25
D. 1.00
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