Tunnel Engineering

In the given figure drill holes, heading, mucking and benching are numbered as 1, 2, 3, 4; The correct sequence is:

  • A. 4, 1, 2, 3
  • B. 1, 2, 3, 4
  • C. 4, 1, 3, 2
  • D. 3, 4, 1, 3
Answer: Option C.
Explanation: 

IS 14665 gives details about elevators. It specifies the number, capacityof elevator and number of floors to be served.

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