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________________?

Related Mcqs:

1. If ‘D’ is the diameter of tunnel in meters, then the thickness of lining in mm, as per the empirical formula is given by_________________?

   A. 42 D
   B. 82 D
   C. 104 D
   D. 124 D

2. Which of the following lining material is useful for shield driven tunnels in sub aqueous regions ?

   A. stone masonry
   B. timber
   C. cast iron
   D. cement concrete

3. Assertion A : English method of tunneling requires more time as compared to other methods of tunneling. Reason R : In English method of tunneling, the masons and excavators have to work alternately/

   A. Both A and R are true and R is the correct explanation of A.
   B. Both A and R are true and R is not the correct explanation of A.
   C. A is true but R is false.
   D. A is false but R is true.

4. Which one of the following is considered to be an advantage of the heading and benching method of tunnel construction?

   A. It is suitable for construction in unstable rocks
   B. In this method, it is easy to install timber support
   C. Tunnelling can be continuous and the work can be expedited
   D. In case of excessive water, it is easy to take correct steps

5. What is the correct sequence of the following events in rock tunnelling?

   1. marking tunnel profile
   2. loading explosives and blasting
   3. checking misfire
   4. mucking
   5. removing foul gas
   6. setting up and drilling
   7. guniting
   Select the correct answer using the codes given below
   Codes ?

   A. 1,6,5,3,4,2,7
   B. 1,2,6,3,5,4,7
   C. 1, 6,2, 5,4, 3, 7
   D. 1,6,2,5,3,4,7

6. What is the correct sequence of the following events of construction of a shaft in rock ?

   1. drilling and blasting
   2. timbering
   3. pumping
   4. mucking

   Select the correct answer using the codes given below Codes?

   A. 1,2,3,4
   B. 1,4,2,3
   C. 2,1,4,3
   D. 2,4,1,3

7. In “full face” method of constructing tunnels, the first operation relates to______________?

   A. removal of bottom portion
   B. excavation of one drift in the centre
   C. removal of top portion
   D. excavation being done along the periphery

8. In compressed air tunneling, the volume of free air provided is______________?

   A. 6 mJ per second per m2 of face area
   B. 6 m3 per minute per m2 of face area
   C. 20 m3 per minute per m2 of face area
   D. 6 m3 per hour per m2 of face area

9. Which one of the following is a component of a shield for tunnelling ?

   A. liner plate
   B. trench jack
   C. stiffener
   D. cutting edge

10. The needle beam method of tunneling______________?

    (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
    select the answer?

    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