Tunnel Engineering - Interview Questions | Exam2Win

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11. Which one of the following tunneling methods is used for laying under ground sewers ?

A. Needle beam method

B. Army method

C. German method

D. Italian method

Explanation:

12. The needle beam method of tunnelling (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 Of these statements

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

Explanation:

13. A good blast with a good yield is obtained if the cut hole is

A. normal to face

B. inclined at 45� to the face

C. inclined at 15� to the face

D. inclined at 30� to the face

Explanation:

14. 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

Explanation:

15. In Belgium method of tunnelling

A. construction of side walls is completed before invert and roof arch are built.

B. construction of roof arch is completed before side walls and invert are built.

C. construction of invert is completed before side walls and roof arch are built.

D. construction of invert and side walls is completed before roof arch is built.

Explanation:

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