Introduction to Tunneling - IES Previous Year Questions

1. Match List-I (Shape of tunnel) with List-II (Suitable for) and select the correct answer using the codes given below the lists:

List-I

  1. Circular section
  2. Horse-shoe section
  3. Egg-shaped
  4. Segmental-roof section

List-II

  1. Soft rock
  2. Hard rock
  3. Carrying water
  4. Sewers
  5. Subways

[IES 1997]

Codes: A B C D

  1.  3  1  4  5
  2.  2  1  4  3
  3.  1   2 3  5
  4.  3  4 2  1
Answer: Option A
Explanation:
  • Circular sections are most suitable for non cohesive soils like sand. These sections are commonly used for aqueducts, sewers and water carrying purposes.
  • Horse-shoe sections are suitable for soft rocks. This shape is commonly used in railways and highways.
  • Egg-shaped section is used for sewers. Egg-shaped sewers maintain self cleansing velocity even in dry weather flow.
  • Segmental-roof sections are suitable for hard rocks. This shape is commonly used for subways.

2.  Match List-I (Shape of tunnel) with List-II (Attribute for preference) and select the correct answer using the codes given below the lists:

List-I

  1. Circular section
  2. Horse-shoe section
  3. Egg-shaped
  4. Segmental-roof section

List-II

  1. Gives self-cleansing velocity even in dry weather flow 
  2. Suitable for soft rocks
  3. Best suited for non-cohesive soils
  4. Suitable for soft materials
  5. Suitable for sub-bays

[IES 1998]

Codes: A B C D

  1.  5  4  1  3
  2.  3  2  4 1
  3.  2  3  1  5
  4.  2  3  4 5
Answer: Option C
Explanation:
  • Egg-shaped section is used for sewers. Egg-shaped sewers maintain self cleansing velocity even in dry weather flow.
  • Circular sections are most suitable for non cohesive soils like sand. These sections are commonly used for aqueducts, sewers and water carrying purposes.
  • Segmental-roof sections are suitable for hard rocks. This shape is commonly used for subways.
  • Horse-shoe sections are suitable for soft rocks. This shape is commonly used in railways and highways.

3. Tunnel alignment is carried out by _____ .

[IES 2001]

  1. Triangulation
  2. Compass traverse
  3. Aerial photography
  4. Surface theodolite traverse
Answer: Option A
Explanation:

4. Weisbach Triangle method may be used for which one of the following ?

[IES 2008]

  1. To transfer levels underground for a tunnel.
  2. To connect surface and underground tunnel surveys.
  3. To connect two ends of an underground tunnel.
  4. To carry out surface alignment of a tunnel.
Answer: Option C
Explanation:
Weisbach triangle method is used to connect two ends of an underground tunnel.
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