In “full face” method of constructing tunnels, the first operation relates to______________? A. removal of bottom portion B. excavation of one drift in the centre C. removal of top portionD. excavation being done along the periphery
In the construction of Metro Railways, “Cut and Cover” method of construction is suitable in situations listed at________________? Consider the following situations 1. Soil is soft 2. Volume of existing surface traffic on the alignment is heavy 3. Track is…
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…
American method of tunneling________________? i) is suitable for large sized tunnels ii) is no,’ suitable for railway or highway tunnel’s iii) requires heavy timbers select the correct answer? A. only (i) is correct B. (i) and (iii) are correct C.…
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…
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…
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 correctB. (iii) and (iv) are coiTect C. (i) and (iv) are correct…
What is the correct sequence of the following events of construction of a shaft in rock ? 1. drilling and blasting 2. timbering 3. pumg 4. mucking Select the correct answer using the codes given below Codes? A. 1,2,3,4B. 1,4,2,3…
As compared to a single free face, if a charge of explosive is placed equidistant from two faces, then the yield___________________? A. remains same B. decreasesC. increases by 2.25 times D. increases by 3.5 times
Circular section of tunnels is not suitable for________________? A. carrying water B. non-cohesive soils C. tunnels driven by shield methodD. placement of concrete lining