As compared to a single free face, if a charge of explosive is placed equidistant from two faces, then the yield___________________?

Related Mcqs:

1. 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

2. 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

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 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

5. 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

6. Drift method of tunnelling is used to construct tunnels in__________________?

   A. soft grounds
   B. rock
   C. self supporting grounds
   D. broken grounds

7. If ‘N’ is the number of shafts used, then the total number of feces available for attacking the excavation and construction in tunnels are_________________________?

   A. 2N
   B. N + 2
   C. 2 N + 1
   D. 2 N + 2

8. Circular section of tunnels is not suitable for________________?

   A. carrying water
   B. non-cohesive soils
   C. tunnels driven by shield method
   D. placement of concrete lining

9. 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________________?

   A. Both A and R are true and R is the correct explanation of A
   B. Both A and R are 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

10. In the construction of Metro Railways, “Cut and Cover” method of construction is suitable in situations listed at________________?

    Consider the following situations

    1. Soil is soft
    2. Volume of existing surface traffic on the alignment is heavy
    3. Track is at a deeper level
    4. Water table is high

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