Practice Test: Question Set - 04
1. Pick up the correct statement from the following during tunnel excavation,
- (A) Oxygen
should not be less than 19.5%
- (B) Carbondioxide
should not be more than 0.5%
- (C) Hydrogen
sulphide should not be more than 0.001%
- (D) All of the
above
2. In case of drift method of tunnelling, the drift may be excavated at
- (A) The centre
- (B) The top or bottom
- (C) The side
- (D) All
of the above
3. In case of railways,
- (A) A detour
round the hill is preferred
- (B) A open cut
is preferred
- (C) Tunnelling
is preferred
- (D) All the
above
4. Which one of the following statements is not correct in respect of setting of an inclined tunnel?
- (A) Reference
points are constructed at every 300 m
- (B) The
alignment is fixed from upper/lower apex point
- (C) The level of
the invert at the heading is marked by a tape
- (D) None the
above
5. Railway tunnels are generally
- (A) Polycentric
- (B) Rectangular
- (C) Parabolic
- (D) Circular
6. The cut of a tunnel face is shown in given figure. This is called
- (A) Michigan cut
- (B) Burn cut
- (C) Fan cut
- (D) Horizontal
cut
7. High pressure grouting is generally restored for concreting in the lining if the rock strata is:
- (A) Highly
fissured
- (B) Poor
- (C) Likely to
get seepage of water
- (D) All of the
above
8. In compressed air tunnelling, the volume of free air provided is
- (A) 6 m3
per second per m² of face area
- (B) 6 m3
per minute per m² of face area
- (C) 20 m3
per minute per m² of face area
- (D) 6 m3
per hour per m² of face area
9. An overhead track on a large truss frame is required in case of car changer by
- (A) The grass
hopper method
- (B) The passing
track method
- (C) California
crossing method
- (D) Dixon
conveyor method
10. 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 a 35 kg weight by each plumb line
- Immersing the weights of both the plumb lines in the buckets containing water
- (A) 1, 2, 3, 4
- (B) 4, 3, 2, 1
- (C) 1, 3, 2, 4
- (D) 2, 1, 4, 3
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