Types of Settling Tank MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Types of Settling Tank, a fundamental topic in the field of Waste Water Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Types of Settling Tank MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Types of Settling Tank mcq questions that explore various aspects of Types of Settling Tank problems. Each MCQ is crafted to challenge your understanding of Types of Settling Tank principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Waste Water Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Types of Settling Tank MCQs are your pathway to success in mastering this essential Waste Water Engineering topic.

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Types of Settling Tank MCQs | Page 8 of 11

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Q71.
Why is Ferric ammonium sulfate generally not used as a coagulant?

a.

It is very expensive

b.

It is dependent on the Dissolved oxygen present in the waste water

c.

It is a very slow process

d.

It works only at high pH

Discuss
Answer: (b).It is dependent on the Dissolved oxygen present in the waste water
Q72.
What is the recommended surface loading rate in case of alum floc suspension?

a.

30-70 m³/m².d

b.

10-30 m³/m².d

c.

70-100 m³/m².d

d.

<10 m³/m².d

Discuss
Answer: (a).30-70 m³/m².d
Q73.
In percentage what is the amount of TSS removed by chemical clarification?

a.

50-60 %

b.

60-70 %

c.

70-80 %

d.

80-90 %

Discuss
Answer: (d).80-90 %
Q74.
In percentage what is the amount of BOD removed by chemical clarification?

a.

20-30 %

b.

50-80 %

c.

30-50 %

d.

80-90 %

Discuss
Answer: (b).50-80 %
Q75.
In percentage, how much does the chemical sludge contribute to the total sludge formed?

a.

0.5 %

b.

1 %

c.

2 %

d.

3 %

Discuss
Answer: (a).0.5 %
Q76.
Assume in a sample of waste water around 60% TSS is removed by primary sedimentation without chemical addition. Calculate the mass of TSS removed for the following data.

Amount of TSS present initially: 220 mg/L
Waste water flow: 1000 m³/d

a.

100 kg/d

b.

130 kg/d

c.

132 kg/d

d.

102 kg/d

Discuss
Answer: (c).132 kg/d
Q77.
Determine the sludge formed from the following set of data.

Specific gravity of sludge: 1.05
Moisture content: 92.5%
Total dry solids: 213.4 kg/1000 m³

a.

2.71 m³/d

b.

2.75 m³/d

c.

2.76 m³/d

d.

3.71 m³/d

Discuss
Answer: (a).2.71 m³/d
Q78.
At what pH is phosphate precipitated out?

a.

8

b.

6

c.

9

d.

10

Discuss
Answer: (d).10
Q79.
Name the compound formed when lime is added in order to precipitate phosphate.

a.

Hydroxylapatite

b.

Ferric phosphate

c.

Calcium phosphate

d.

Calcium Carbonate

Discuss
Answer: (a).Hydroxylapatite
Q80.
At which point, chemical addition for phosphorous removal can’t be carried out?

a.

Preliminary treatment

b.

Prior to primary sedimentation tank

c.

Prior to secondary treatment

d.

After secondary treatment

Discuss
Answer: (a).Preliminary treatment
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