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19.

If 'D' is the diameter of tunnel in metres, then the thickness of lining in mm, as per the empirical formula is given by                        
A. 42 D B. 82 D
C. 104 D D. 124 D



20.

In Belgium method of tunnelling                        
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.



21.

In compressed air tunneling, the volume of free air provided is                        
A. 6 mJ per second per m2 of face area B. 6 m3 per minute per m2 of face area
C. 20 m3 per minute per m2 of face area D. 6 m3 per hour per m2 of face area




22.

What is the correct sequence of the following events of construction of a shaft in rock ?
1.drilling and blasting
2.timbering
3.pumping
4.mucking
Select the correct answer usiny the codes given below Codes :                        
A. 1,2,3,4 B. 1,4,2,3
C. 2,1,4,3 D. 2,4,1,3



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