A. 2N
B. N + 2
C. 2 N + 1
D. 2 N + 2
A. propelling jacks
B. liner plate
C. hood
D. tail
A. 42 D
B. 82 D
C. 104 D
D. 124 D
A. 2 m
B. 3 m
C. 4 m
D. 5 m
A. construction of side walls is completed before invert and roof arch are built
B. construction of roof arch is completed before side walls and invert are built
C. construction of invert is completed before side walls and roof arch are built
D. construction of invert and side walls is completed before roof arch is built
A. soft grounds
B. rock
C. self supporting grounds
D. broken grounds
A. liner plate
B. trench jack
C. stiffener
D. cutting edge
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
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. Army method
B. Needle beam method
C. Austrian method
D. English method