Q.1

Which one of the following methods is generally adopted for tunnelling in firm ground

  • Full face method
  • Top heading and benching method
  • Drift method
  • All the above.
Q.2

Pick up the correct statement regarding drilling a tunnel from the following:

  • Holes are drilled by pneumatically operated rock drills
  • One drill is required for each 4 to 5 m2 force area
  • The diameter of the bore hole at the deepest point should be 6 mm more than the diameter of the cartridge
  • All of the above.
Q.3

An overhead track on a large truss frame is required in case of car changer by

  • the grass hopper method
  • the passing track method
  • California crossing method
  • Dixon conveyor method.
Q.4

For tunnels exceedingm in length, the grade should be provided below

  • 50% of the ruling gradient
  • 60% of the ruling gradient
  • 75% of the ruling gradient
  • 80% of the ruling gradient.
Q.5

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 height point on the ridge is fixed with the help of reciprocal ranging
  • The accuracy of 1 in 10, 000 is required for planimetric control
  • 1 second theodolite is used for angular measurement to achieve an angular error of 15 N where N is number of angles
  • All the above.
Q.6

The method of draining in the tunnels, is generally known as

  • foredrainage
  • dewatering
  • permanent drainage
  • All of the above.
Q.7

Pick up the correct statement from the following during tunnel excavation,

  • Oxygen should not be less than 19.5%
  • Carbondioxide should not be more than 0.5%
  • Hydrogen sulphide should not be more than 0.001%
  • Carbon mono-oxide should not be more than 0.01%
  • All of the above.
Q.8

The length of the needle beam used in needle beam method of tunnelling is usually

  • 2 m to 4 m
  • 2.5 m to 6 m
  • 4 m to 7 m
  • 5 m to 6 m
Q.9

To attain the required shape of the tunnel section, we use :

  • easers
  • trimmers
  • cut holes
  • chisels.
Q.10

The length of the needle beam used in needle beam method of tunnelling is usually

  • 2 m to 4 m
  • 2.5 m to 6 m
  • 4 m to 7 m
  • 5 m to 6 m
Q.11

Which one of the following methods is generally used for the layout of the muck-car tracks

  • the grass hopper method
  • passing track method
  • the cherry picker
  • California crossing, Dixon conveyor
  • All the above.
Q.12

The most commonly adopted pattern of cut holes is :

  • horizontal wedge cut
  • pyramid cut
  • fan cut
  • V-cut
  • All the above.
Q.13

Pick up the mechanical ventilation method used for tunnels from the following:

  • blowing fresh air by ducts to the face of tunnel
  • exhausting foul air by ducts from the face of the tunnel and permitting fresh air through the tunnel
  • blowing fresh air and exhausting foul air by ducts
  • all the above.
Q.14

In the wooded bulk-head, used for mucking in steep grade tunnels,

  • one opening is provided
  • two openings are provided
  • three openings are provided
  • no opening is provided.
Q.15

For transferring the tunnel alignment through shafts, we adopt the following steps :
Hanging two or more plumb lines in the shaft
Determining the bearing of the plumb lines i.e. plumb plane
Suspending akg weight by each plumb line
Immersing the weights of both the plumb lines in the buckets containing water.
The correct sequence of steps is :

  • 1 2 3 4
  • 4 3 2 1
  • l 3 2 4
  • 2 1 4 3
Q.16

Which one of the following linings is suitable for shield driven tunnels particularly in the subaqueous regions :

  • Brick lining
  • stone lining
  • timber line
  • cast iron lining
  • concrete lining.
Q.17

Which one of the following methods of tunnelling does not require the use of time bearing :

  • Linear plate method
  • Shield method
  • Compressed air method
  • Mechanical tunneler i.e. mole method
  • All the these.
Q.18

Railway tunnels, are generally

  • polycentric
  • rectangular
  • parabolic
  • circular
  • none of these.
Q.19

For initial surveys of tunnels, the following activities are involved:
Marking portal point with concrete pillars on the ground
Marking tunnel obligatory points on the topographical maps
Preliminary setting of the tunnel on the topographical Survey of India maps
Driving lines between the fixed obligatory points.
The correct sequence of the activities is :

  • 3 2 4 1
  • 1 2 3 4
  • 4 3 1 2
  • 2 4 3 1
Q.20

In case of railways,

  • a detour round the hill is preferred
  • a open cut is preferred
  • tunnelling is preferred
  • All the above.
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