Q79
What is the function of a collar in shaft sinking?
A.
Dust suppression
B.
Shaft mouth reinforcement
AnswerC.
Pump housing
D.
Blast initiation point
Answer: Option B
Solution
Answer: Option B
Solution:
Shaft collar is the reinforced area at the top of a shaft.The correct answer is: Shaft mouth reinforcementIt prevents ground sloughing and provides support for hoisting gear.Usually made of concrete or steel.