A. only up holes
B. only down holes
C. horizontal or up holes
D. horizor„al, down or up holes
A. propelling jacks
B. liner plate
C. hood
D. tail
A. remains same
B. decreases
C. increases by 2.25 times
D. increases by 3.5 times
A. Needle beam method
B. Army method
C. German method
D. Italian method
i) is suitable for large sized tunnels
ii) is no,’ suitable for railway or highway tunnel’s
iii) requires heavy timbers
select the correct answer?
A. only (i) is correct
B. (i) and (iii) are correct
C. (ii) and (iii) are correct
D. (i) and (ii) are correct
(i) shot drill
(ii) diamond drill
(iii) wagon drill
(iv) churn drill
select correct answer?
A. (i) and (ii) are correct
B. (iii) and (iv) are coiTect
C. (i) and (iv) are correct
D. (ii) and (iii) are correct
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