Engineering - Civil Enginnering

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1.

A good blast with a good yield is obtained if the cut hole is                        
A. normal to face B. inclined at 45° to the face
C. inclined at 15° to the face D. inclined at 30° to the face



2.

As compared to a single free face, if a charge of explosive is placed equidistant from two faces, then the yield                        
A. remains same B. decreases
C. increases by 2.25 times D. increases by 3.5 times



3.

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




4.

Drift method of tunnelling is used to construct tunnels in                        
A. soft grounds B. rock
C. self supporting grounds D. broken grounds



5.

Drifters can be used to drill                        
A. only up holes B. only down holes
C. horizontal or up holes D. horizontal, down or up holes



6.

If 'N' is the number of shafts used, then the total number of feces available for attacking the excavation and construction in tunnels are                        
A. 2N B. N + 2
C. 2 N + 1 D. 2 N + 2



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