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Tunnel Engineering MCQ

1.Forepoling method is generally adopted for tunnelling in

  • ASoft ground
  • BFirm ground
  • CRunning ground
  • DNone of these
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Correct Answer : (A)

Soft ground
Explanation:

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

  • A10 meters depth
  • B15 meters depth
  • C20 meters depth
  • D25 meters depth
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Correct Answer : (B)

15 meters depth
Explanation:

3.If ‘N’ is the number of shafts used, then the total number of faces available for attacking the excavation and construction in tunnels are

  • A2N
  • BN + 2
  • C2N + 1
  • D2N + 2
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Correct Answer : (D)

2N + 2
Explanation:

4.Pick up the correct statement regarding drilling a tunnel from the following

  • AHoles are drilled by pneumatically operated rock drills
  • BOne drill is required for each 4 to 5 m2 force area
  • CThe diameter of the bore hole at the deepest point should be 6 mm more than the diameter of the cartridge
  • DAll of the above
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Correct Answer : (D)

All of the above
Explanation:

5.In compressed air tunnelling, the volume of free air provided is

  • A6 m3 per second per m2 of face area
  • B6 m3 per minute per m2 of face area
  • C20 m3 per minute per m2 of face area
  • D6 m3 per hour per m2 of face area
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Correct Answer : (B)

6 m3 per minute per m2 of face area
Explanation:

6.Which one of the following tunneling methods is used for laying underground sewers?

  • ANeedle beam method
  • BArmy method
  • CGerman method
  • DItalian method
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Correct Answer : (B)

Army method
Explanation:

7.In case of railways

  • AA detour round the hill is preferred
  • BA open cut is preferred
  • CTunnelling is preferred
  • DAll the above
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Correct Answer : (C)

Tunnelling is preferred
Explanation:

8.For tunnels exceeding 300 m in length, the grade should be provided below

  • A50% of the ruling gradient
  • B60% of the ruling gradient
  • C75% of the ruling gradient
  • D80% of the ruling gradient
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Correct Answer : (C)

75% of the ruling gradient
Explanation:

9.Which one of the following linings is suitable for shield driven tunnels particularly in the sub-aqueous regions?

  • ABrick lining
  • BStone lining
  • CTimber line
  • DCast iron lining
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Correct Answer : (D)

Cast iron lining
Explanation:

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

  • ATwo sections
  • BThree sections
  • CFour sections
  • DFive sections
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Correct Answer : (B)

Three sections
Explanation:

11.The most suitable soil for compressed air tunnelling is

  • ASilt
  • BSand
  • CClay
  • DGravel
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Correct Answer : (C)

Clay
Explanation:

12.To attain the required shape of the tunnel section, we use

  • AEasers
  • BTrimmers
  • CCut holes
  • DChisels
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Correct Answer : (B)

Trimmers
Explanation:

13.Which one of the following methods of tunnelling does not require the use of time bearing?

  • ALinear plate method
  • BShield method
  • CCompressed air method
  • DAll of these
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Correct Answer : (D)

All of these
Explanation:

14.In case of drift method of tunnelling, the drift may be excavated at

  • AThe centre
  • BThe top or bottom
  • CThe side
  • DAll of the above
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Correct Answer : (D)

All of the above
Explanation:

15.Pick up the correct statement from the following during tunnel excavation

  • AOxygen should not be less than 19.5%
  • BCarbondioxide should not be more than 0.5%
  • CHydrogen sulphide should not be more than 0.001%
  • DAll of the above
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Correct Answer : (D)

All of the above
Explanation:

16.Drift method of tunneling is used to construct tunnels in

  • ASoft grounds
  • BRock
  • CSelf supporting grounds
  • DBroken grounds
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Correct Answer : (B)

Rock
Explanation:

17.As compared to a single free face, if a charge of explosive is placed equidistant from two faces, then the yield

  • ARemain same
  • BDecreases
  • CIncreases by 2.25 times
  • DIncreases by 3.5 times
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Correct Answer : (C)

Increases by 2.25 times
Explanation:

18.If ‘D’ is the diameter of tunnel in meters, then the thickness of lining in mm, as per the empirical formula is given by

  • A42 D
  • B82 D
  • C104 D
  • D124 D
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Correct Answer : (B)

82 D
Explanation:

19.For B.G. single track, the section of the tunnel must have a width

  • A4.2 m to 4.5 m
  • B4.5 m to 4.8 m
  • C4.9 m to 5.5 m
  • D5.5 m to 5.8 m
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Correct Answer : (C)

4.9 m to 5.5 m
Explanation:

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

  • AMuck box
  • BSide dump car
  • CU-bottom
  • DAll of these
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Correct Answer : (D)

All of these
Explanation:

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