Ribs are used for strengthening and stiffening the liner plate for tunnels of diameter greater than_____________________?

A. 2 m
B. 3 m
C. 4 m
D. 5 m

In Belgium method of tunneling _________________?

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

Drift method of tunnelling is used to construct tunnels in__________________?

A. Soft grounds
B. Rock
C. Self supporting grounds
D. Broken grounds

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

A. Liner plate
B. Trench jack
C. Stiffener
D. Cutting edge

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

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

A. 1. marking tunnel profile
B. 2. loading explosives and blasting
C. 3. checking misfire
D. 4. mucking

Which of the following methods of tunneling is used for long tunnels at great depths ?

A. Army method
B. Needle beam method
C. Austrian method
D. English method

The most suitable soil for compressed air tunneling is________________?

A. Silt
B. Sand
C. Clay
D. Gravel

Which one of the following tunnelling methods is used for laying under ground sewers ?

A. Needle beam method
B. Army method
C. German method
D. Italian method

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