Tunnel Engineering Quiz | Tunnel Engineering Multiple Choice Questions and Answers

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Questions
1 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

Answer: 6 m3 per minute per m2 of face area
2 Which of the following is not a component of the shield ?
A propelling jacks
B liner plate
C hood
D tail

Answer: liner plate
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3 The correct sequence of drilling equipment for increasing size of holes in tunnels is
A wagon drill, churn drill, shot drill
B wagon drill, shot drill, churn drill
C shot drill, churn drill, wagon drill
D churn drill, wagon drill, shot drill

Answer: wagon drill, churn drill, shot drill
4 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

Answer: 2 N + 2
5 Drifters can be used to drill
A only up holes
B only down holes
C horizontal or up holes
D horizor„al, down or up holes

Answer: horizor„al, down or up holes
6 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 coiTect
C (i) and (iv) are correct
D (ii) and (iii) are correct

Answer: (iii) and (iv) are coiTect
7 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

Answer: increases by 2.25 times
8 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

Answer: inclined at 45° to the face
9 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 using 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

Answer: 1,4,2,3
10 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

Answer: placement of concrete lining
11 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.

Answer: construction of roof arch is completed before side walls and invert are built.
12 Which of the following methods of tunneling is used for long tunnels at great depths ?
A Army method
B Needle beam method
C Austrian method
D English method

Answer: Austrian method
13 The needle beam method of tunneling

(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

A only (i) is correct
B (i), (ii) and (iv) are correct
C (i), (iii) and (iv) are correct
D (i) and (ii) are correct

Answer: (i), (ii) and (iv) are correct
14 The most suitable soil for compressed air tunneling is
A silt
B sand
C clay
D gravel

Answer: clay
15 Ribs are used for strengthening and stiffening the liner plate for tunnels of diameter greater than
A 2 m
B 3 m
C 4 m
D 5 m

Answer: 3 m
16 Which one of the following tunnelling methods is used for laying under ground sewers ?
A Needle beam method
B Army method
C German method
D Italian method

Answer: Army method
17 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

Answer: 82 D
18 Which of the following lining material is useful for shield driven tunnels in sub aqueous regions ?
A stone masonry
B timber
C cast iron
D cement concrete

Answer: cast iron
19 American method of tunneling

i) is suitable for large sized tunnels

A only (i) is correct
B (i) and (iii) are correct
C (ii) and (iii) are correct
D (i) and (ii) are correct

Answer: only (i) is correct
20

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 :
A Both A and R are true and R is the correct explanation of A.
B Both A and R are true and R is not the correct explanation of A.
C A is true but R is false.
D A is false but R is true.

Answer: Both A and R are true and R is the correct explanation of A.

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