Tunnel Engineering

Which of the following are percussion drills?
(i) Shot drill
(ii) Diamond drill
(iii) Wagon drill
(iv) Churn drill

  • A. (i) and (ii) are correct
  • B. (iii) and (iv) are correct
  • C. (i) and (iv) are correct
  • D. (ii) and (iii) are correct
Answer: Option B.

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

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