1. Circular section of tunnels is not suitable for
a) carrying water
b) non-cohesive soils
c) tunnels driven by shield method
d) placement of concrete lining
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
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
a) remains same
b) decreases
c) increases by 2.25 times
d) increases by 3.5 times
(i) shot drill
(ii) diamond drill
(iii) wagon drill
(iv) churn drill Of these statements
a) (i) and (ii) are correct
b) (iii) and (iv) are correct
c) (i) and (iv) are correct
d) (ii) and (iii) are correct
a) carrying water
b) non-cohesive soils
c) tunnels driven by shield method
d) placement of concrete lining
Ans: d
2. 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
Ans: b
3. A good blast with a good yield is obtained if the cut hole isa) normal to face
b) inclined at 45° to the face
c) inclined at 15° to the face
d) inclined at 30° to the face
Ans: b
4. As compared to a single free face, if a charge of explosive is placed equidistant from two faces, then the yielda) remains same
b) decreases
c) increases by 2.25 times
d) increases by 3.5 times
Ans: c
5. Which of the following are percussion drills ?(i) shot drill
(ii) diamond drill
(iii) wagon drill
(iv) churn drill Of these statements
a) (i) and (ii) are correct
b) (iii) and (iv) are correct
c) (i) and (iv) are correct
d) (ii) and (iii) are correct
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