Tunnelling Online Test – Multiple Choice Questions and Answers 1. For full face method, the excavation to be done is generally divided into two sections three sections four sections five sections 2. In case of railways, a detour round the hill is preferred a open cut is preferred tunnelling is preferred All 3. For B.G. single track, the section of the tunnel must have a width 4.2 m to 4.5 m 4.5 m to 4.8 m 4.9 m to 5.5 m 5.5 m to 5.8 m 4. Which one of the following statements is not correct with regard to heading and hench-ing method of tunnelling Firing of head holes is done just before the bench holes are fired The holes in head and bench are loaded together with explosive for blasting After driving the top portion 3 m to 3.5 m holes are drilled into the head and bench Driving the top portion is done in advance of the bottom portion 5. For hauling muck from the tunnel, the following type of muck-car is used : balle-ship side dump car U-bottom All 6. Forepoling method is generally adopted for tunnelling in : firm ground soft ground running ground None of these 7. For transferring the tunnel alignment through shafts, we adopt the following steps : 1. Hanging two or more plumb lines in the shaft 2. Determining the bearing of the plumb lines i.e. plumb plane 3. Suspending a 35 kg weight by each plumb line 4. Immersing the weights of both the plumb lines in the buckets containing water. The correct sequence of steps is : 1 2 3 4 l 3 2 4 2 1 4 3 4 3 2 1 8. For initial surveys of tunnels, the following activities are involved: 1. Marking portal point with concrete pillars on the ground 2. Marking tunnel obligatory points on the topographical maps 3. Preliminary setting of the tunnel on the topographical Survey of India maps 3. Driving lines between the fixed obligatory points. The correct sequence of the activities is : 1 2 3 4 3 2 4 1 2 4 3 1 4 3 1 2 9. Pick up the correct statement from the following: The topographical maps of the Survey of India are useful in the mountainous region for tunnelling The accuracy of 1 in 10, 000 is required for planimetric control The height point on the ridge is fixed with the help of reciprocal ranging All 10. Which one of the following methods is adopted for permanent drainage of tunnels : continuous open drains concrete lining grouting with cement or chemicals All Loading … Question 1 of 10
