- (A) 4 to 8 hours
- (B) 8 to 16 hours
- (C) 16 to 24 hours
- (D) 24 to 36 hours
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- (A) 100 cm
- (B) 90 cm
- (C) 80 cm
- (D) 50 cm
- (A) Used to remove the grease and oil
- (B) Those from which sludge is skimmed out
- (C) Tanks provided with self- cleansing screens
- (D) Improved version of grit chambers
- (A) Bazin
- (B) Crimp and Bruges
- (C) William-Hazen
- (D) Kutter
- (A) 2 days
- (B) 7 days
- (C) 12 days
- (D) 14 days
- (A) 30 to 40%
- (B) 40 to 60%
- (C) 60 to 80%
- (D) 80 to 90%
- (A) 10 days
- (B) 20 days
- (C) 30 days
- (D) 60 days
- (A) 10 cm
- (B) 15 cm
- (C) 20 cm
- (D) All the above
- (A) Oxygen
- (B) Nitrogen
- (C) Hydrogen
- (D) Carbon dioxide
- (A) Nitrates
- (B) Nitrites
- (C) Free ammonia
- (D) None of these
