Waste Water Engineering MCQ Questions & Answers

71

Which one of the following resists hydrogen sulphide corrosion?

A) R.C.C. B) Glazed stone wares C) Asbestos cement D) Glazed ware

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Answer & Solution

Answer: Option D

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72

The gas evolved in sewers is

A) Carbondioxide B) Hydrogen sulphide C) Methane D) All of these

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Answer & Solution

Answer: Option D

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73

The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is

A) 1.095 B) 1.085 C) 1.075 D) 1.065

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Answer & Solution

Answer: Option A

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74

Pick up the correct statement from the following:

A) The sewer pipes of sizes less than 0.4 m diameter are designed as running full at maximum discharge B) The sewer pipes of sizes greater than 0.4 m diameter are designed as running $${\frac{2}{3}^{{\text{rd}}}}$$ or $${\frac{3}{4}^{{\text{th}}}}$$ full at maximum discharge C) The minimum design velocity of sewer pipes is taken as 0.8 m/sec D) All the above

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Answer & Solution

Answer: Option D

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75

Pick up the correct statement from the following:

A) Anaerobic bacteria flourish in the absence of oxygen B) Aerobic bacteria flourish in the presence of oxygen C) Facultative bacteria flourish with or without oxygen D) All the above

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Answer & Solution

Answer: Option D

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76

The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is

A) 1.5 B) 2.0 C) 3.0 D) 4.0

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Answer & Solution

Answer: Option B

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77

The sewerage system originates from

A) House sewers B) Lateral sewers C) Branch sewers D) Main sewers

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Answer & Solution

Answer: Option A

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78

The digested sludge from septic tanks, is removed after a maximum period of

A) 3 years B) 3.5 years C) 4 years D) 5 years

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Answer & Solution

Answer: Option A

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79

The underground sewers are more subjected to

A) Tensile force B) Compressive force C) Bending force D) Shearing force

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Answer & Solution

Answer: Option B

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80

The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning’s formula, is given by

A) Bazin B) Crimp and Bruges C) William-Hazen D) Kutter

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Answer & Solution

Answer: Option B

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Waste Water Engineering MCQ Questions & Answers | Civil Engineering