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Water-and-waste-water Questions Set 18:

Quiz Mode

At what pH range should re-carbonation be done?

4.5

8.2

9.4-9.6

Solution:

The uniformity coefficient of filter sand is given by which of the following expressions?

D₅₀/D₅

D₅₀/D₁₀

D₆₀/D₅

D₆₀/D₁₀

Solution:

Which one of the following tests uses the ferroin indicator?

Chemical oxygen demand

Ammonia nitrogen

Nitrate nitrogen

Fluoride

Solution:

What is the other name given for permanent hardness?

Brinell hardness

Carbonate hardness

Pseudo hardness

Non-carbonate hardness

Solution:

In which type of settling does a dilute suspension of particles take place?

Discrete settling

Compression settling

Hindered settling

None of the above

Solution:

Which of the following water filtration methods produces water of higher bacteriological quality?

Slow sand filter

Rapid sand filter

Pressure filter

Dual media filter

Solution:

In a test conducted to determine relative stability at 30°C, the period of incubation is found to be 6 days. What is the percent of relative stability?

84.57%

88.74%

92.40%

95.01%

Solution:

A municipal corporation is required to treat 1000 m³/day of water. It is found that an overflow rate of 20 m/day will produce a satisfactory removal of the discrete suspended particles at a depth of 3 m. The diameter (in meters, rounded off to the nearest integer) of a circular settling tank designed for the removal of these particles would be______.

Solution:

The raw water entering an ideal horizontal settling tank contains the following two types of particles:

I. Settling Velocity: 3 m/h, Concentration: 200 mg/L

II. Settling Velocity: 1 m/h, Concentration: 300 mg/L

When the surface overflow rate of the settling tank is 3 m³/m²/h, the concentration of the particles in the settled water will be:

100 mg/L

200 mg/L

300 mg/L

400 mg/L

Solution:

The hardness of a ground water sample was found to be 420 mg/l as CaCO₃. A softener containing ion exchange resins was installed to reduce the total hardness to 75 mg/l as CaCO₃ before supplying to 4 households. Each household gets treated water at a rate of 540l/day. If the efficiency of the softener is 100% the bypass flow rate (up to two decimal places, expressed in l/day) is______.

Water-and-waste-water Questions Set 18:

At what pH range should re-carbonation be done?

Solution:

The uniformity coefficient of filter sand is given by which of the following expressions?

Solution:

Which one of the following tests uses the ferroin indicator?

Solution:

What is the other name given for permanent hardness?

Solution:

In which type of settling does a dilute suspension of particles take place?

Solution:

Which of the following water filtration methods produces water of higher bacteriological quality?

Solution:

In a test conducted to determine relative stability at 30°C, the period of incubation is found to be 6 days. What is the percent of relative stability?

Solution:

Solution:

Solution:

Solution:

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