In the construction of Metro Railways, “Cut and Cover” method of construction is suitable in situations listed at________________?

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 at a deeper level
4. Water table is high

A. 1 and 2
B. 1 and 3
C. 1 and 4
D. 2 and 3

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________________?

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________________?

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

American method of tunneling________________?

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. (ii) and (iii) are correct
D. (i) and (ii) are correct

The needle beam method of tunneling______________?

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 correct
D. (i) and (ii) are correct

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/

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.