Environmental Engineering Archives

The settling velocity of a particle in a sedimentation tank increases if______________?

The settling velocity of a particle in a sedimentation tank increases if______________?

A. particle size is decreased
B. the surface area of tank is increased
C. the depth of tank is decreased
D. none of the above

The settling velocity of a particle in a sedimentation tank increases if______________? Read More »

Environmental Engineering

Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about_______________?

Environmental Engineering / admin

Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about_______________?

A. 10 to 25
B. 50
C. 75(Correct)
D. 100

Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about_______________? Read More »

Environmental Engineering

The length of rectangular sedimentation tank should not be more than_______________?

Environmental Engineering / admin

The length of rectangular sedimentation tank should not be more than_______________?

A. B
B. 2B
C. 4B(Correct)
D. 8B

where B is the width of the tank

The length of rectangular sedimentation tank should not be more than_______________? Read More »

Environmental Engineering

The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of________________?

Environmental Engineering / admin

The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of________________?

A. 1 mg/litre
B. 10 mg/litre(Correct)
C. 100 mg/litre
D. 1000 mg/litre

The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of________________? Read More »

Environmental Engineering

If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to________________?

Environmental Engineering / admin

If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to________________?

A. total alkalinity(Correct)
B. total hardness
C. total hardness – total alkalinity
D. non carbonate hardness

If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to________________? Read More »

Environmental Engineering

Residual chlorine in water is determined by________________?

Environmental Engineering / admin

Residual chlorine in water is determined by________________?

A. starch iodide method
B. orthotolidine method
C. both (A) and (B)(Correct)
D. none of the above

Residual chlorine in water is determined by________________? Read More »

Environmental Engineering

Turbidity is measured on_______________?

Environmental Engineering / admin

Turbidity is measured on_______________?

A. standard silica scale
B. standard cobalt scale
C. standard platinum scale
D. platinum cobalt scale

Turbidity is measured on_______________? Read More »

Environmental Engineering

The maximum permissible limit for flouride in drinking water is______________?

Environmental Engineering / admin

The maximum permissible limit for flouride in drinking water is______________?

A. 0.1 mg/litre
B. 1.5 mg/litre
C. 5 mg/litre
D. 10 mg/litre

The maximum permissible limit for flouride in drinking water is______________? Read More »

Environmental Engineering

Alkalinity in water is expressed as milli-grams per litre in terms of equivalent_______________?

Environmental Engineering / admin

Alkalinity in water is expressed as milli-grams per litre in terms of equivalent_______________?

A. calcium carbonate
B. magnesium carbonate
C. sodium carbonate
D. calcium hydroxide

Alkalinity in water is expressed as milli-grams per litre in terms of equivalent_______________? Read More »

Environmental Engineering

The most common cause of acidity in water is_______________?

Environmental Engineering / admin

The most common cause of acidity in water is_______________?

A. carbon dioxide
B. oxygen
C. hydrogen
D. nitrogen

The most common cause of acidity in water is_______________? Read More »

Environmental Engineering