Tunnelling

1

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

A. provision of longitudinal drains

B. continuous open drains

C. concrete lining

D. grouting with cement or chemicals

E. All the above.

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2

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

A. muck box

B. balle-ship

C. side dump car

D. U-bottom

E. All of these.

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3

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.

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4

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

A. 2 m to 4 m

B. 2.5 m to 6 m

C. 4 m to 7 m

D. 5 m to 6 m

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5

Pick up the correct statement from the following:

A. The topographical maps of the Survey of India are useful in the mountainous region for tunnelling.

B. The height point on the ridge is fixed with the help of reciprocal ranging

C. The accuracy of 1 in 10, 000 is required for planimetric control

D. 1 second theodolite is used for angular measurement to achieve an angular error of 15 N where N is number of angles

E. All the above.

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