Tunnel Engineering

Pick up the correct statement from the following during tunnel excavation_____.

  • A. Oxygen should not be less than 19.5%
  • B. Carbondioxide should not be more than 0.5%
  • C. Hydrogen sulphide should not be more than 0.001%
  • D. All of the above
Answer: Option D.

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

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