American method of tunneling________________?

A. I) is suitable for large sized tunnels
B. Ii) is no,’ suitable for railway or highway tunnel’s
C. Iii) requires heavy timbers
D. Select the correct answer?

The needle beam method of tunneling______________?

A. (i) is suitable for soils in which roof can stand for few minutes without support
B. (ii) is suitable for brick lining
C. (iii) is suitable for concrete lining
D. (iv) requires large number of trench jacks

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.

Which of the following are percussion drills ?

A. (i) shot drill
B. (ii) diamond drill
C. (iii) wagon drill
D. (iv) churn drill

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

A. 1. drilling and blasting
B. 2. timbering
C. 3. pumping
D. 4. mucking

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

A. Remains same
B. Decreases
C. Increases by 2.25 times
D. Increases by 3.5 times

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

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

Which of the following is not a component of the shield ?

A. Propelling jacks
B. Liner plate
C. Hood
D. Tail

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