Civil Engineering - Tunnelling

Exercise :: Tunnelling - Section 1

  • Tunnelling - Section 1
36. 

Which one of the following methods is generally adopted for tunnelling in firm ground

A. Full face method
B. Top heading and benching method
C. Drift method
D. All the above.

Answer: Option D

Explanation:

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37. 

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.

Answer: Option A

Explanation:

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38. 

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.

Answer: Option E

Explanation:

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39. 

In the given figure drill holes, heading, mucking and benching are mumbered as 1, 2, 3, 4 The correct sequence is :

A. 4 1 2 3
B. 1 2 3 4
C. 4 1 3 2
D. 3 4 1 3

Answer: Option C

Explanation:

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40. 

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

Answer: Option D

Explanation:

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