Q29
Which one of the following is used to support weak roof in underground mining?
A.
Timber sets
AnswerB.
Shaft lining
C.
Portal gate
D.
Blasting mats
Answer: Option A
Solution
Answer: Option A
Solution:
Timber sets are traditional roof support structures.The correct answer is: Timber setsThey are used in weak ground to prevent collapse.Still in use for temporary or small-scale operations.