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16. The most suitable soil for compressed air tunneling is

A. silt

B. sand

C. clay

D. gravel

Explanation:

17. If 'D' is the diameter of tunnel in metres, then the thickness of lining in mm, as per the empirical formula is given by

A. 42 D

B. 82 D

C. 104 D

D. 124 D

Explanation:

18. Which of the following methods of tunneling is used for long tunnels at great depths ?

A. Army method

B. Needle beam method

C. Austrian method

D. English method

Explanation:

19. What is the correct sequence of the following events in rock tunnelling? # marking tunnel profile # loading explosives and blasting # checking misfire # mucking # removing foul gas # setting up and drilling # guniting Select the correct answer using the codes given below. Codes:

A. 1,6,5,3,4,2,7

B. 1,2,6,3,5,4,7

C. 1, 6,2, 5,4, 3, 7

D. 1,6,2,5,3,4,7

Explanation:

20. Assertion A : When rock conditions are favorable, it will not be necessary to take up concrete lining concurrently with the driving operations till the full length of the tunnel has been driven through rock. Reason R : A tunnel through rock, hard or soft, does not need any concrete lining. Select your answer based on the coding system given below:

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is not the correct explanation of A.

C. A is true but R is false.

D. A is false but R is true.

Explanation:

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