Answer: 6 m3 per minute per m2 of face area
Answer: 6 m3 per minute per m2 of face area
Answer: liner plate
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Answer: wagon drill, churn drill, shot drill
Answer: 2 N + 2
Answer: horizor„al, down or up holes
(i) shot drill
(ii) diamond drill
(iii) wagon drill
(iv) churn drill Of these statements
Answer: (iii) and (iv) are coiTect
Answer: increases by 2.25 times
Answer: inclined at 45° to the face
1. drilling and blasting
2. timbering
3. pumping
4. mucking
Select the correct answer using the codes given below Codes :Answer: 1,4,2,3
Answer: placement of concrete lining
Answer: construction of roof arch is completed before side walls and invert are built.
Answer: Austrian method
(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 Of these statements
Answer: (i), (ii) and (iv) are correct
Answer: clay
Answer: 3 m
Answer: Army method
Answer: 82 D
Answer: cast iron
i) is suitable for large sized tunnels
Answer: only (i) is 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.
Select your answer based on the coding system given below :Answer: Both A and R are true and R is the correct explanation of A.
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