- (A) Running expenses
- (B) Maintenance expenses
- (C) Operation expenses
- (D) All the above
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- (A) 0.112 kg in suspension
- (B) 0.112 kg in solution
- (C) 0.225 kg in solution
- (D) Both
- (A) A sedimentation tank and an activated sludge treatment plant
- (B) A plant consisting of Imhoff tanks with low rate trickling filters
- (C) Sedimentation tanks with high rate trickling filters
- (D) None of these
- (A) A trunk sewer
- (B) An outfall sewer
- (C) A main sewer
- (D) An intercepting sewer
- (A) Mean radius of sewer
- (B) Difference in heads between two points in circular pipes
- (C) Mean of radii in a pipe line of varying cross -sections
- (D) Cross-sectional area/wetted perimeter
- (A) Are water seals which prevent the entry of foul gases
- (B) Are used to trap the rats entering sewers
- (C) Dissolve the foul gases
- (D) Create symphonic action to increase the quick disposal of sewerage
- (A) Flourish in the presence of free oxygen
- (B) Consume organic matter as their food
- (C) Oxidise organic matter in sewage
- (D) All the above
- (A) 30 litres/person/year
- (B) 25 litres/person/year
- (C) 30 litres/person/month
- (D) 25 litres/person/month
- (A) 2 hours
- (B) 4 hours
- (C) 6 hours
- (D) 8 hours
- (A) Steel pipes
- (B) Steel shell coated from inside with cement mortar
- (C) Steel shell coated from outside with cement mortar
- (D) Both
