০০। A tunnel is found more advantageous as compared to the alternate routes because it:
ক) remains free from snow
খ) reduces the cost by reducing the route distance
গ) reduces the maintenance cost
ঘ) avoids interference with surface rights
ঙ) All the above.
০১। An overhead track on a large truss frame is required in case of car changer by
ক) the grass hopper method
খ) the passing track method
গ) California crossing method
ঘ) Dixon conveyor method.
০২। Concrete lining is provided concurrently with the driving operation in case of
ক) rock terrain
খ) soft rock
গ) running soil
ঘ) none of these.
০৩। For B.G. single track railway, the height of the tunnel above top of rails should be
ক) 5.5 m to 5.8 m
খ) 5.8 m to 6.2 m
গ) 6.7 m to 7.3 m
ঘ) 7.3 m to 7.5 m
০৪। For B.G. single track, the section of the tunnel must have a width
ক) 4.2 m to 4.5 m
খ) 4.5 m to 4.8 m
গ) 4.9 m to 5.5 m
ঘ) 5.5 m to 5.8 m
০৫। For full face method, the excavation to be done is generally divided into
ক) two sections
খ) three sections
গ) four sections
ঘ) five sections.
০৬। For hauling muck from the tunnel, the following type of muck-car is used :
ক) muck box
খ) balle-ship
গ) side dump car
ঘ) U-bottom
ঙ) All of these.
০৭। For highways, tunnelling is preferred to if the open cut exceeds :
ক) 10 metres depth
খ) 15 metres depth
গ) 20 metres depth
ঘ) 25 metres depth.
০৮। 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 :
ক) 3 2 4 1
খ) 1 2 3 4
গ) 4 3 1 2
ঘ) 2 4 3 1
০৯। 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 :
ক) 1 2 3 4
খ) 4 3 2 1
গ) l 3 2 4
ঘ) 2 1 4 3
১০। For tunnels exceeding 300 m in length, the grade should be provided below
ক) 50% of the ruling gradient
খ) 60% of the ruling gradient
গ) 75% of the ruling gradient
ঘ) 80% of the ruling gradient.
১১। Forepoling method is generally adopted for tunnelling in :
ক) soft ground
খ) firm ground
গ) running ground
ঘ) None of these.
১২। High pressure grouting is generally restored for concreting in the lining if the rock strata is:
ক) highly fissured
খ) poor
গ) likely to get seepage of water
ঘ) All of the above.
১৩। In case of drift method of tunnelling, the drift may be excavated at
ক) the centre
খ) the bottom
গ) the top
ঘ) the side
ঙ) All of the above.
১৪। In case of railways,
ক) a detour round the hill is preferred
খ) a open cut is preferred
গ) tunnelling is preferred
ঘ) All the above.
১৫। In the given figure drill holes, heading, mucking and benching are mumbered as 1, 2, 3, 4 The correct sequence is :
ক) 4 1 2 3
খ) 1 2 3 4
গ) 4 1 3 2
ঘ) 3 4 1 3
১৬। In the wooded bulk-head, used for mucking in steep grade tunnels,
ক) one opening is provided
খ) two openings are provided
গ) three openings are provided
ঘ) no opening is provided.
১৭। Pick up the correct statement from the following during tunnel excavation,
ক) Oxygen should not be less than 19.5%
খ) Carbondioxide should not be more than 0.5%
গ) Hydrogen sulphide should not be more than 0.001%
ঘ) Carbon mono-oxide should not be more than 0.01%
ঙ) All of the above.
১৮। Pick up the correct statement regarding drilling a tunnel from the following:
ক) Holes are drilled by pneumatically operated rock drills
খ) One drill is required for each 4 to 5 m2 force area
গ) The diameter of the bore hole at the deepest point should be 6 mm more than the diameter of the cartridge
ঘ) All of the above.
১৯। Pick up the explosive used for tunnelling in soft rocks from the following :