1.Sewerage system of a railway colony may be
(a)Combined system
(b)Separate system
(c)Partially combined system
(d)Any of them*
Answer - (d)Any of them*
2..Self cleaning velocity of a sewer line depends upon
(a) Diameter of sewer
(b) Gradient of ewer line
(c) Type of sewerage
(d) All of them*
Answer - (d) All of them*
4.For design of sewers for sullage, minimum velocity of ---- metres per second is taken.
(a)1.0 m sec*
(b)1.5 m/sec
(c)2.0 m/sec
(d)2.5 m/sec
5.For achieving self-cleaning velocity, a minimum velocity of ---- mps. Is desirable for design peak flow
(a)0.6 mps
(b)0.8 mps*
(c)1.0 mps
(d)2.0 mps
Answer - (b)0.8 mps*
6.Indicate which of the statement is incorrect
(a)The detritus tank is type of a grit chamber
(b)In detritus tank, velocity of flow is further reduced
(c)Grit chambers are provided in the sewage treatment process to remove the heavier inorganic matter as grit, sand etc. from the sewage
(d)None of them*
Answer - (d)None of them*
7.In case of septic tank, the length (L) to width (B) ratio is generally
(a) L = 3 B*
(b) L = 5 B
(c) L = 1.5 B
(d) L = B
Answer - (a) L = 3 B*
8.Effective depth of septic tank of 10 users is about
(a)1.0 m
(b)1.2 m*
(c)1.7 m
(d)2.0 m
Answer - (b)1.2 m*
9.Free board given in septic tank is about
(a)100 mm
(b)200 mm
(c)300 mm*
(d)500 mm
Answer - (c)300 mm*
10.The internal size of bio latrine tank is
(a)1200mm. x 1200mm. x 670mm.
(b)1200mm. x 670mm. x 1200mm.*
(c)1200mm. x 760mm. x 1200mm.
(d)None of these
Answer - (b)1200mm. x 670mm. x 1200mm.*
11.Indian type W.C. pan shall have 10cm. S.C.I. trap P or S type with effective seal of
(a)5 cm.*
(b)10 cm.
(c)7.5 cm
(d)None of these
Answer - (a)5 cm.*
12.The capacity of high level flushing cistern is generally
(a)7.5 ltrs.
(b)10 ltrs.*
(c)12.5 ltrs.
(d)None of these
Answer - (b)10 ltrs.*
13.Maximum height of low level cistern from top of W.C. pan should be
(a)65 cm.
(b)30 cm.
(d)120 cm.
(e)80 cm.
Answer - (b)30 cm.
14.15.For high level flush the nominal dia of flush pipe shall be
(a)32 mm*
(b)40 mm
(c)25 mm
(d)None of these
Answer - (a)32 mm*
16.The urinal basin shall be connected with
(a)High level floating cistern*
(b)Low level floating cistern
(c)Automatic floating cistern
(d)Any one of the above
Answer - (a)High level floating cistern*
15 The capacity of automatic flushing cistern connected with one urinal shall be
(a)05 litrs.
(b) 10 litrs.
(c) 12.5 litrs.
(d) None of these
Answer - (a)05 litrs.
16 The capacity of automatic flushing cistern connected with two urinal shall be
(a)10 litrs.*
(b) 12.5 litrs.
(c) 05 litrs.
(d) None of these
Answer - (a)10 litrs.*
17 The capacity of automatic flushing cistern connected with three urinal shall be
(a) 05 litrs.
(b) 10 litrs.
(c)12.5 litrs.*
(d) None of these
Answer - (c)12.5 litrs.*
18. The wash hand basin shall be fixed at a height of
(a) 75-80 cm*
(b) 75 cm
(c) 80 cm
(d) Not specified
Answer - (a) 75-80 cm*
19. Before discharging the foul sewage into rivers, it is generally treated by
(a) screening
(b) sedimentation
(c) Oxidation
(d) sludge digestion and disinfection
(e) all the above*
Answer - (e) all the above*
20. If the pH value of sewage is
(a) it is acidic
(b) it is alkaline
(c) it is neutral*
(e)None of these
Answer - (c) it is neutral*
21. Biochemical Oxygen Demand (BOD) of sewage is the
(a) Oxygen required to oxidise
(b) Oxygen required to oxidise biologically inactive organic matter*
(c) a and b both
(d) none of these
Answer - (b) Oxygen required to oxidise biologically inactive organic matter*
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