11. 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.
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 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.
i) is suitable for large sized tunnels
ii) is no,' suitable for railway or highway tunnel's
iii) requires heavy timbers Of these statements
a) only (i) is correct
b) (i) and (iii) are correct
c) (ii) and (iii) are correct
d) (i) and (ii) are correct
a) stone masonry
b) timber
c) cast iron
d) cement concrete
a) 42 D
b) 82 D
c) 104 D
d) 124 D
a) Needle beam method
b) Army method
c) German method
d) Italian method
Reason R : In English method of tunneling, the masons and excavators have to work alternately.
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 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.
Ans: a
12. American method of tunnelingi) is suitable for large sized tunnels
ii) is no,' suitable for railway or highway tunnel's
iii) requires heavy timbers Of these statements
a) only (i) is correct
b) (i) and (iii) are correct
c) (ii) and (iii) are correct
d) (i) and (ii) are correct
Ans: a
13. Which of the following lining material is useful for shield driven tunnels in sub aqueous regions ?a) stone masonry
b) timber
c) cast iron
d) cement concrete
Ans: c
14. If 'D' is the diameter of tunnel in metres, then the thickness of lining in mm, as per the empirical formula is given bya) 42 D
b) 82 D
c) 104 D
d) 124 D
Ans: b
15. Which one of the following tunneling methods is used for laying under ground sewers ?a) Needle beam method
b) Army method
c) German method
d) Italian method
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