Waste Water Engineering MCQ Questions & Answers

71

Which one of the following tests is used for testing sewer pipes?

A) Water test B) Ball test C) Mirror test D) All of these

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Answer & Solution

Answer: Option D

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72

Pick up the correct statement from the following:

A) The larger the sewer in size, more will be velocity B) The smaller the sewer in size, less will be velocity C) The larger the sewer in size, no deposition will take place D) The larger the sewer in size, deposition will take place

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Answer & Solution

Answer: Option D

Solution:

As the size of the sewer increases, the velocity of the flow decreases because the flow is spread over a larger cross-sectional area.

This decrease in velocity can lead to deposition of solids, as the flow may not be strong enough to carry the sediment through the sewer.

Therefore, in larger sewers, there is a higher likelihood of deposition taking place.

73

Pick up the incorrect statement from the following:

A) The mixture of water and waste products, is called sewage B) The treated sewage effluents, are generally used for irrigating the crops C) The process of collecting, treating and disposing off the sewage, is called sewerage D) The old convergence system was definitely better than water carried sewerage system

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Answer & Solution

Answer: Option D

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74

Aerobic activity is maximum

A) In freshly produced sewage B) At sewer pipes C) In sewer treatment plants D) None of these

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Answer & Solution

Answer: Option A

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75

During preliminary treatment of a sewage

A) Oil and grease are removed from skimming tanks B) Floating materials are removed by screening C) Girt and sand are removed by girt chambers D) All the above

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Answer & Solution

Answer: Option D

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76

Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is

A) $${{\text{p}}_{\text{t}}} = \frac{{3{{\text{H}}^3}{\text{p}}}}{{2\pi {{\text{Z}}^5}}}$$ B) $${{\text{p}}_{\text{t}}} = \frac{{2{{\text{H}}^3}{\text{p}}}}{{3\pi {{\text{Z}}^5}}}$$ C) $${{\text{p}}_{\text{t}}} = \frac{{{\text{3}}{{\text{H}}^3}{\text{p}}}}{{2{{\text{Z}}^5}}}$$ D) $${{\text{p}}_{\text{t}}} = \frac{{{\text{2}}\pi {{\text{H}}^3}{\text{p}}}}{{3\pi {{\text{Z}}^5}}}$$ E) None of these

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Answer & Solution

Answer: Option A

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77

Traps

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

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Answer & Solution

Answer: Option A

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78

In sewage having fully oxidised organic matter, the nitrogen exists in the form of

A) Nitrites B) Nitrates C) Free ammonia D) Aluminoid nitrogen

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Answer & Solution

Answer: Option B

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79

In sewers the highest non-scouring velocity is achieved in

A) Glazed bricks sewers B) Cast iron sewers C) Cement concrete sewers D) Stone ware sewers

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Answer & Solution

Answer: Option A

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80

If the pH value of sewage is 7

A) It is acidic B) It is alkaline C) It is neutral D) None of these

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Answer & Solution

Answer: Option C

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Waste Water Engineering MCQ Questions & Answers | Civil Engineering