21. 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
a) soft grounds
b) rock
c) self supporting grounds
d) broken grounds
1. Soil is soft.
2. Volume of existing surface traffic on the alignment is heavy.
3. Track is at a deeper level.
4. Water table is high.
In the construction of Metro Railways, "Cut and Cover" method of construction is suitable in situations listed at
a) 1 and 2
b) 1 and 3
c) 1 and 4
d) 2 and 3
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.
a) removal of bottom portion
b) excavation of one drift in the center
c) removal of top portion
d) excavation being done along the periphery
b) trench jack
c) stiffener
d) cutting edge
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.
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
Ans: d
22. Drift method of tunnelling is used to construct tunnels ina) soft grounds
b) rock
c) self supporting grounds
d) broken grounds
Ans: b
23. Consider the following situations.1. Soil is soft.
2. Volume of existing surface traffic on the alignment is heavy.
3. Track is at a deeper level.
4. Water table is high.
In the construction of Metro Railways, "Cut and Cover" method of construction is suitable in situations listed at
a) 1 and 2
b) 1 and 3
c) 1 and 4
d) 2 and 3
Ans: c
24. 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.
Ans: c
25. In "full face" method of constructing tunnels, the first operation relates toa) removal of bottom portion
b) excavation of one drift in the center
c) removal of top portion
d) excavation being done along the periphery
Ans: d
26. Which one of the following is a component of a shield for tunneling ?
a) liner plateb) trench jack
c) stiffener
d) cutting edge
Ans: d
27. 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.
Ans: c
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