Question bank for Limited Departmental Competitive Examination (LDC) examination Sanitary Engineering

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Question bank for Limited Departmental Competitive Examination (LDC) examination Sanitary Engineering

 

1. Sewerage system of a railway colony may be

  1. Combined system
  2. Separate system
  3. Partially combined system
  4. Any of them

Answer: Any of them

 

2. The capacity of high level flushing cistern is generally

  1. 7.5 ltrs.
  2. 10 ltrs.
  3. 12.5 ltrs.
  4. None of these

Answer: 10 ltrs.

 

3. Self-cleaning velocity of a sewer line depends upon

  1. Diameter of sewer
  2. Gradient of ewer line
  3. Type of sewerage
  4. All of them

Answer: All of them

 

4. For design of sewers for sullage, minimum velocity of ---- metres per second is taken.

  1. 1.0 m sec
  2. 1.5 m/sec
  3. 2.0 m/sec
  4. 2.5 m/sec

Answer: 1.0 m sec

 

5. For achieving self-cleaning velocity, a minimum velocity of ---- mps. Is desirable for design peak flow

  1. 0.6 mps
  2. 0.8 mps
  3. 1.0 mps
  4. 2.0 mps

Answer: 0.8 mps

 

6. Indicate which of the statement is incorrect

  1. The detritus tank is type of a grit chamber
  2. In detritus tank, velocity of flow is further reduced
  3. Grit chambers are provided in the sewage treatment process to remove the heavier inorganic matter as grit, sand etc. from the sewage
  4. None of them

Answer: None of them

 

7. In case of septic tank, the length (L) to width (B) ratio is generally

  1. L = 3 B
  2. L = 5 B
  3. L = 1.5 B
  4. L = B

Answer: L = 3 B

 

8. Effective depth of septic tank of 10 users is about

  1. 1.0 m
  2. 1.2 m
  3. 1.7 m
  4. 2.0 m

Answer: 1.2 m

 

9. Free board given in septic tank is about

  1. 100 mm
  2. 200 mm
  3. 300 mm*
  4. 500 mm

Answer: 300 mm

 

10. The internal size of bio latrine tank is

  1. 1200mm. x 1200mm. x 670mm.
  2. 1200mm. x 670mm. x 1200mm.*
  3. 1200mm. x 760mm. x 1200mm.
  4. None of these

Answer: 1200mm. x 670mm. x 1200mm

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