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________________?

Related Mcqs:

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...

Which one of the following is a component of a shield for tunnelling ?

A. liner plate B. trench jack C. stiffener D. cutting edge...

Which one of the following is considered to be an advantage of the heading and benching method of tunnel construction?

A. It is suitable for construction in unstable rocks B. In this method, it is easy to install timber support C. Tunnelling can be continuous and the work can be expedited D. In case of excessive water, it is easy to take correct steps...

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...

Which of the following are percussion drills ?

(i) shot drill (ii) diamond drill (iii) wagon drill (iv) churn drill select correct answer? A. (i) and (ii) are correct B. (iii) and (iv) are coiTect C. (i) and (iv) are correct D. (ii) and (iii) are correct...