Q.1

For highways, tunnelling is preferred to if the open cut exceeds :

  • 10 metres depth
  • 15 metres depth
  • 20 metres depth
  • 25 metres depth.
Q.2

Pick up the explosive used for tunnelling in soft rocks from the following :

  • blasting gelatine
  • special gelatine
  • ammonia dynamite
  • semi-gelatine.
Q.3

For full face method, the excavation to be done is generally divided into

  • two sections
  • three sections
  • four sections
  • five sections.
Q.4

The following tunnels were constructed in different countries for different purposes :
Emperor Claudius built the first Roman tunnel
The first highway tunnel was constructed in Hungary
The first underground railway tunnel was constructed in Great Britain
The first navigational tunnel was constructed in France.
The correct chronological development of these tunnels is:

  • 4 1 3 2
  • 1 4 2 3
  • 2 3 1 4
  • 3 2 4 1
Q.5

The following operations are required for tunnelling in rocky terrain :
Removing the foul gases
Marking the tunnel profile
Setting up and drilling
Checking misfire
Mucking
The correct sequence is :

  • 1 2 3 4 5
  • 2 3 5 4 1
  • 4 2 1 3 5
  • 2 3 1 4 5
Q.6

The tunnels, the artificial underground passages are constructed for :

  • highways
  • railways
  • sewerage
  • water supply project
  • All the above.
Q.7

The following operations are generally employed for tunnelling in hard rock.
Removing ground water,
Loading holes and firing the explosive
Setting up and drilling
Grouting and lining
Removing muck
Ventilation and removing explosion dust
The correct sequence is :

  • 3 2 6 5 1 4
  • 3 4 6 1 5 2
  • 4 1 2 3 6 5
  • 5 4 2 1 3 6
Q.8

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

  • economy in cost of construction
  • avoidance of head on collisions
  • provision of separate exit and entrance of two traffic streams
  • facility in carrying out repairs
  • All the above.
Q.9

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
Q.10

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
Q.11

Which one of the following statements is not correct in respect of setting of an inclined tunnel:

  • Reference points are constructed at every 300 m.
  • The alignment is fixed from upper/lower apex point.
  • The level of the invert at the heading is marked by a tape.
  • Reference points are constructed on the roof of tunnels
  • None the above.
Q.12

Forepoling method is generally adopted for tunnelling in :

  • soft ground
  • firm ground
  • running ground
  • None of these.
Q.13

Concrete lining is provided concurrently with the driving operation in case of

  • rock terrain
  • soft rock
  • running soil
  • none of these.
Q.14

High pressure grouting is generally restored for concreting in the lining if the rock strata is:

  • highly fissured
  • poor
  • likely to get seepage of water
  • All of the above.
Q.15

Which one of the following statements is not correct for heading and benching method of tunnelling ?

  • Drilling and mucking can be done simultaneously
  • Benching provides a plateform for working on heading
  • Removal of muck from the heading is very easy
  • None of these.
Q.16

The concentration of the dust particles of the size 0.5 to 5 microns adjacent to the working face should not be more than

  • 200 particles/cm3
  • 250 particles/cm3
  • 300 particles/cm3
  • 450 particles/cm3
  • 400 particles/cm3
Q.17

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

  • muck box
  • balle-ship
  • side dump car
  • U-bottom
  • All of these.
Q.18

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

  • 0.30 m
  • 0.45 m
  • 0.60 m
  • 0.75 m
Q.19

Which one of the following statements is not correct with regard to heading and hench-ing method of tunnelling.

  • Driving of tunnel is done in two portions of its section
  • Driving the top portion is done in advance of the bottom portion.
  • After driving the top portion 3 m to 3.5 m holes are drilled into the head and bench.
  • The holes in head and bench are loaded together with explosive for blasting.
  • Firing of head holes is done just before the bench holes are fired.
Q.20

Which one of the following methods is adopted for permanent drainage of tunnels :

  • provision of longitudinal drains
  • continuous open drains
  • concrete lining
  • grouting with cement or chemicals
  • All the above.
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