Which of the following are percussion drills ?

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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...

What is the correct sequence of the following events in rock tunnelling?

1. marking tunnel profile 2. loading explosives and blasting 3. checking misfire 4. mucking 5. removing foul gas 6. setting up and drilling 7. 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...

What is the correct sequence of the following events of construction of a shaft in rock ?

1. drilling and blasting 2. timbering 3. pumping 4. mucking Select the correct answer using the codes given below Codes? A. 1,2,3,4 B. 1,4,2,3 C. 2,1,4,3 D. 2,4,1,3...

Assertion A : English method of tunneling requires more time as compared to other methods of tunneling. Reason R : In English method of tunneling, the masons and excavators have to work alternately/

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

The needle beam method of tunneling______________?

(i) is suitable for soils in which roof can stand for few minutes without support (ii) is suitable for brick lining (iii) is suitable for concrete lining (iv) requires large number of trench jacks select the answer? A. only (i) is correct B. (i), (ii) and (iv) are correct C. (i), (iii) and (iv) are … The needle beam method of tunneling______________?Read More...