Tunnel Engineering

The needle beam method of tunnelling
(i) Is suitable for soils in which roof can stand for few minutes without support
(ii) Is suitable for brick lining
(iii) Is suitable for concrete lining
(iv) Requires large number of trench jacks

  • A. Only (i) is correct
  • B. (i), (ii) and (iv) are correct
  • C. (i), (iii) and (iv) are correct
  • D. (i) and (ii) 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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