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Civil Engineering :: Tunneling

Tunneling - Section 1

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

    2. A.
    Drilling and mucking can be done simultaneously
    B.
    Benching provides a plateform for working on heading
    C.
    Removal of muck from the heading is very easy
    D.
    None of these.

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

    3. A.
    0.30 m
    B.
    0.45 m
    C.
    0.60 m
    D.
    0.75 m

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

    4. A.
    the centre
    B.
    the bottom
    C.
    the top
    D.
    the side
    E.
    All of the above.

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  4. A tunnel is found more advantageous as compared to the alternate routes because it:

    5. A.
    remains free from snow
    B.
    reduces the cost by reducing the route distance
    C.
    reduces the maintenance cost
    D.
    avoids interference with surface rights
    E.
    All the above.

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  5. For B.G. single track railway, the height of the tunnel above top of rails should be

    6. A.
    5.5 m to 5.8 m
    B.
    5.8 m to 6.2 m
    C.
    6.7 m to 7.3 m
    D.
    7.3 m to 7.5 m

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

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

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

    8. A.
    50% of the ruling gradient
    B.
    60% of the ruling gradient
    C.
    75% of the ruling gradient
    D.
    80% of the ruling gradient.

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

    9. A.
    foredrainage
    B.
    dewatering
    C.
    permanent drainage
    D.
    All of the above.

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

    10. 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.
    Carbon mono-oxide should not be more than 0.01%
    E.
    All of the above.

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

    11. A.
    easers
    B.
    trimmers
    C.
    cut holes
    D.
    chisels.

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