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Water-and-waste-water Questions Set 12:

Quiz Mode

What is the recommended contact time for disinfection with chloramine?

1 hour

2 hours

3 hours

4 hours

Solution:

What form of chlorine is present in water when the pH is between 5 and 10?

Hypochlorous acid

Hypochlorite ions

Molecular chlorine

Hypochlorous acid and hypochlorite ions

Solution:

A sewage flow of 7 MLD with a BOD₅ of 200 mg/L is applied to a trickling filter with a volume of 7000 m³. The efficiency of the trickling filter is:

99.50%

99.60%

99.80%

99.90%

Solution:

In an activated sludge process, the mixed liquor suspended solids (MLSS) concentration is 4000 mg/L and the sludge volume index (SVI) is 180 ml/g. Find the return sludge ratio.

0.33

0.25

0.67

0.75

Solution:

What is the predominant coagulation mechanism for raw water having high turbidity and high alkalinity?

Ionic layer compression

Adsorption and charge neutralization

Sweep coagulation

Inter particle bridging

Solution:

What is the correct sequence of slow sand filter (SSF), rapid sand filter (RSF), and dual media filter (DMF) in the increasing order of their filtration rate?

DMF > RSF > SSF

DMF > SSF > RSF

RSF > DMF > SSF

SSF > RSF > DMF

Solution:

A waste activated sludge (WAS) is to be blended with green waste (GW). The carbon (C) and nitrogen (N) contents, per kg of WAS and GW, on dry basis are given in the table.
The ratio of WAS to GW required (up to two decimal places) to achieve a blended C:N ratio of 20:1 on dry basis is _________.

Solution:

An inverted siphon is a

Device for distributing septic tank effluent to a soil absorption system

Device for preventing overflow from elevated water storage tank

Device for preventing crown corrosion of sewer

Section of sewer which is dropped below the hydraulic gradient line in order to avoid an obstacle.

Solution:

Which one of the following statement is FALSE about Jackson Turbiditimeters?

The lowest turbidity value that can be measured on this instrument is 25

A Jackson turbiditimeter is also called a Jackson’s candle turbiditimeter

The longer the light path, the lower the turbidity

Height of column will be less for less turbid water and vice-versa

Solution:

A circular pipe has a diameter of 1m, bed slope of 1 in 1000, and Manning’s roughness coefficient equal to 0.01. It may be treated as an open channel flow when it is flowing just full, i.e., the water level just touches the crest. The discharge in this condition is denoted by Q_full. Similarly, the discharge when the pipe is flowing half-full, i.e., with a flow depth of 0.5m, is denoted by Q_half. The ratio of Q_full/Q_half is:

√2

Water-and-waste-water Questions Set 12:

What is the recommended contact time for disinfection with chloramine?

Solution:

What form of chlorine is present in water when the pH is between 5 and 10?

Solution:

A sewage flow of 7 MLD with a BOD₅ of 200 mg/L is applied to a trickling filter with a volume of 7000 m³. The efficiency of the trickling filter is:

Solution:

In an activated sludge process, the mixed liquor suspended solids (MLSS) concentration is 4000 mg/L and the sludge volume index (SVI) is 180 ml/g. Find the return sludge ratio.

Solution:

What is the predominant coagulation mechanism for raw water having high turbidity and high alkalinity?

Solution:

What is the correct sequence of slow sand filter (SSF), rapid sand filter (RSF), and dual media filter (DMF) in the increasing order of their filtration rate?

Solution:

A waste activated sludge (WAS) is to be blended with green waste (GW). The carbon (C) and nitrogen (N) contents, per kg of WAS and GW, on dry basis are given in the table.
The ratio of WAS to GW required (up to two decimal places) to achieve a blended C:N ratio of 20:1 on dry basis is _________.

Solution:

An inverted siphon is a

Solution:

Which one of the following statement is FALSE about Jackson Turbiditimeters?

Solution:

Solution:

Related Question Sets:

Related Topics:

Water-and-waste-water Questions Set 12:

What is the recommended contact time for disinfection with chloramine?

Solution:

What form of chlorine is present in water when the pH is between 5 and 10?

Solution:

A sewage flow of 7 MLD with a BOD5 of 200 mg/L is applied to a trickling filter with a volume of 7000 m3. The efficiency of the trickling filter is:

Solution:

In an activated sludge process, the mixed liquor suspended solids (MLSS) concentration is 4000 mg/L and the sludge volume index (SVI) is 180 ml/g. Find the return sludge ratio.

Solution:

What is the predominant coagulation mechanism for raw water having high turbidity and high alkalinity?

Solution:

What is the correct sequence of slow sand filter (SSF), rapid sand filter (RSF), and dual media filter (DMF) in the increasing order of their filtration rate?

Solution:

A waste activated sludge (WAS) is to be blended with green waste (GW). The carbon (C) and nitrogen (N) contents, per kg of WAS and GW, on dry basis are given in the table.The ratio of WAS to GW required (up to two decimal places) to achieve a blended C:N ratio of 20:1 on dry basis is _________.

Solution:

An inverted siphon is a

Solution:

Which one of the following statement is FALSE about Jackson Turbiditimeters?

Solution:

Solution:

Related Question Sets:

Related Topics:

A sewage flow of 7 MLD with a BOD₅ of 200 mg/L is applied to a trickling filter with a volume of 7000 m³. The efficiency of the trickling filter is:

A waste activated sludge (WAS) is to be blended with green waste (GW). The carbon (C) and nitrogen (N) contents, per kg of WAS and GW, on dry basis are given in the table.
The ratio of WAS to GW required (up to two decimal places) to achieve a blended C:N ratio of 20:1 on dry basis is _________.