6.Which one of the following is a component of a shield for tunneling ?

7.Ribs are used for strengthening and stiffening the liner plate for tunnels of diameter greater than

8.Drift method of tunnelling is used to construct tunnels in

9.Which of the following are percussion drills ? (i) shot drill (ii) diamond drill (iii) wagon drill (iv) churn drill Of these statements

10.Consider the following situations. # Soil is soft. # Volume of existing surface traffic on the alignment is heavy. # Track is at a deeper level. # Water table is high. In the construction of Metro Railways, "Cut and Cover" method of construction is suitable in situations listed at