Tunnel Engineering

Assertion A: When rock conditions are favorable, it will not be necessary to take up concrete lining concurrently with the driving operations till the full length of the tunnel has been driven through rock.
Reason R: A tunnel through rock, hard or soft, does not need any concrete lining
Select your answer based on the coding system given below:

  • A. Both A and R is true and R is the correct explanation of A
  • B. Both A and R is true but R is not the correct explanation of A
  • C. A is true but R is false
  • D. A is false but R is true
Answer: Option C.

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

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