Question 31. For initial surveys of tunnels, the following activities are involved:1.Marking portal point with concrete pillars on the ground2.Marking tunnel obligatory points on the topographical maps3.Preliminary setting of the tunnel on the topographical Survey of India maps4.Driving lines between the fixed obligatory pointsThe correct sequence of the activities is:

Question 32. In Belgium method of tunnelling

Question 33. The advantages of providing a pair of tunnels as compared to only one large highway tunnel is:

Question 34. Which one of the following methods is adopted for permanent drainage of tunnels?

Question 35. What is the correct sequence of the following events of construction of a shaft in rock?1.Drilling and blasting 2.Timbering 3.Pumping 4.Mucking Select the correct answer using the codes given below Codes:

Question 36. Which one of the following is a component of a shield for tunneling?

Question 37. The correct sequence of drilling equipment for increasing size of holes in tunnels is

Question 38. For hauling muck from the tunnel, the following type of muck-car is used:

Question 39. The difference of heights of the tunnels above rail tops of BG and MG tracks is kept

Question 40. For B.G. single track, the section of the tunnel must have a width