Collection Systems
Wastewater Collection Systems
Solved Example: 9082-01
In sewerage system drop manholes are provided when there is a: (DSSSB AE Civil Sep 2021)
A. Sloping ground, with drop more than 0.6 m is required to control the gradient.
B. Change in alignment of sewer line
C. Change in size of sewers
D. Change from gravity system to pressure system
Correct Answer: A
Solved Example: 9082-02
The diameter of a domestic sewer pipe laid at gradient 1 in 100 is recommended: (BPSC AE Paper VI Civil 2019)
A. 100 mm
B. 150 mm
C. 200 mm
D. 175 mm
Correct Answer: B
Solved Example: 9082-03
Intercepting traps are often provided at the junction of: (MP Sub Engg Civil July 2017 Shift II)
A. Sullage pipe and floors of kitchen and bath
B. House sewer and municipal sewer
C. Ventilating column and lateral sewer
D. Room or roof drain and the other drain coming from bath and kitchen
Correct Answer: B
Solved Example: 9082-04
Which of the following sewers collects the discharge from a collecting system and delivers it to a treatment plant? (UPPCL JE CE 2015)
A. Outfall sewer
B. Branch sewer
C. House sewer
D. Lateral sewer
Correct Answer: A
Solved Example: 9082-05
Sewer lines having difference of more than 600 mm in the water lines and inverse level of two sewers are connected with a: (MPSC AE Civil Mains 2018 Paper II)
A. Siphon
B. Manhole
C. Inspection chamber
D. Drop manhole
Correct Answer: D
Solved Example: 9082-06
Two sewer pipelines A and B (having the same diameter and made of the same material) are laid at a bed slope of 1 in 225 and 1 in 625, respectively. Determine the ratio of their carrying capacities (Q$_A$ to Q$_B$). (SSC JE CE Mar 2021 Morning)
A. $\dfrac{5}{3}$
B. 1
C. $\dfrac{3}{5}$
D. $\dfrac{2}{5}$
Correct Answer: A