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Water-and-waste-water Questions Set 13:

Quiz Mode

The color of water measured on the cobalt scale should be:

>20

<20

20 - 30

Solution:

Which chemical is used to remove the permanent hardness of calcium chloride water?

Lime

Chlorine

Soda ash

Both lime and soda ash

Solution:

The pH range that should be maintained for optimal performance of anaerobic digestion of sewage sludge is:

4.5 - 6

6.5 - 8

8 - 10

10.5 - 12

Solution:

What is the primary purpose of a piston valve?

Regulates flow

Regulates pressure

Regulates fluids without suspended solids

Regulates fluids carrying suspended solids

Solution:

The Ca²⁺ and Mg²⁺ ion concentrations of a water sample are 160 mg/l and 40 mg/l respectively. The total hardness of the water sample in terms of CaCO₃ in mg/l is approximately:

120

200

267

567

Solution:

Normally, earthwork is estimated for a 30 m lead distance and 1.5 m lift or depth. This distance of 30 m and height of 1.5 m are known as _____________

normal lead and lift

vertical lead and lift

horizontal lead and lift

transverse lead and lift

Solution:

A water treatment plant is designed to treat 1 m³/s of raw water. It has 14 sand filters. Surface area of each filter is 50 m². What is the loading rate (to the nearest integer, in m³/day.m²) with two filters out of service for routine backwashing?

Solution:

To calculate the volume of earthwork from a contour plan for filling a depression or pond, and for cutting a hillock, the prismoidal formula may be used conveniently.

The elevation method

The prismoidal formula

The section area method

The contour method

Solution:

A septic tank is to be designed for a town of 1,000 people with a water supply of 250 liters per capita per day (lpcd). If 80% of the water supplied is converted into sewage, find the total dispersion trench area required.

7,623 m²

8,429 m²

9,500 m²

10,000 m²

Solution:

Find the energy content on dry basis and also energy content on ash-free dry basis if the moisture content of the solid waste is 15% and the ash content is 7%. The energy content of the solid waste as discarded is 50,000 kJ/kg.

55,222 kJ/kg, 59,764 kJ/kg

58,823 kJ/kg, 64,102 kJ/kg

62,102 kJ/kg, 66,649 kJ/kg

65,371 kJ/kg, 68,991 kJ/kg

Water-and-waste-water Questions Set 13:

The color of water measured on the cobalt scale should be:

Solution:

Which chemical is used to remove the permanent hardness of calcium chloride water?

Solution:

The pH range that should be maintained for optimal performance of anaerobic digestion of sewage sludge is:

Solution:

What is the primary purpose of a piston valve?

Solution:

The Ca²⁺ and Mg²⁺ ion concentrations of a water sample are 160 mg/l and 40 mg/l respectively. The total hardness of the water sample in terms of CaCO₃ in mg/l is approximately:

Solution:

Normally, earthwork is estimated for a 30 m lead distance and 1.5 m lift or depth. This distance of 30 m and height of 1.5 m are known as _____________

Solution:

A water treatment plant is designed to treat 1 m³/s of raw water. It has 14 sand filters. Surface area of each filter is 50 m². What is the loading rate (to the nearest integer, in m³/day.m²) with two filters out of service for routine backwashing?

Solution:

To calculate the volume of earthwork from a contour plan for filling a depression or pond, and for cutting a hillock, the prismoidal formula may be used conveniently.

Solution:

A septic tank is to be designed for a town of 1,000 people with a water supply of 250 liters per capita per day (lpcd). If 80% of the water supplied is converted into sewage, find the total dispersion trench area required.

Solution:

Find the energy content on dry basis and also energy content on ash-free dry basis if the moisture content of the solid waste is 15% and the ash content is 7%. The energy content of the solid waste as discarded is 50,000 kJ/kg.

Solution:

Related Question Sets:

Related Topics:

Water-and-waste-water Questions Set 13:

The color of water measured on the cobalt scale should be:

Solution:

Which chemical is used to remove the permanent hardness of calcium chloride water?

Solution:

The pH range that should be maintained for optimal performance of anaerobic digestion of sewage sludge is:

Solution:

What is the primary purpose of a piston valve?

Solution:

The Ca2+ and Mg2+ ion concentrations of a water sample are 160 mg/l and 40 mg/l respectively. The total hardness of the water sample in terms of CaCO3 in mg/l is approximately:

Solution:

Normally, earthwork is estimated for a 30 m lead distance and 1.5 m lift or depth. This distance of 30 m and height of 1.5 m are known as _____________

Solution:

A water treatment plant is designed to treat 1 m3/s of raw water. It has 14 sand filters. Surface area of each filter is 50 m2. What is the loading rate (to the nearest integer, in m3/day.m2) with two filters out of service for routine backwashing?

Solution:

To calculate the volume of earthwork from a contour plan for filling a depression or pond, and for cutting a hillock, the prismoidal formula may be used conveniently.

Solution:

A septic tank is to be designed for a town of 1,000 people with a water supply of 250 liters per capita per day (lpcd). If 80% of the water supplied is converted into sewage, find the total dispersion trench area required.

Solution:

Find the energy content on dry basis and also energy content on ash-free dry basis if the moisture content of the solid waste is 15% and the ash content is 7%. The energy content of the solid waste as discarded is 50,000 kJ/kg.

Solution:

Related Question Sets:

Related Topics:

The Ca²⁺ and Mg²⁺ ion concentrations of a water sample are 160 mg/l and 40 mg/l respectively. The total hardness of the water sample in terms of CaCO₃ in mg/l is approximately:

A water treatment plant is designed to treat 1 m³/s of raw water. It has 14 sand filters. Surface area of each filter is 50 m². What is the loading rate (to the nearest integer, in m³/day.m²) with two filters out of service for routine backwashing?