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.Management Sciences
Category: Environmental Engineering
Laying of sewers is usually done with the help of________________?
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A. a theodolite
B. a compass
C. sight rails and boning rods
D. a plane table
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
The layout of distribution system in which water flows towards the outer periphery is_________________?
A. ring system
B. dead end system
C. radial system
D. grid iron system
Chlorine demand of water is equal to________________?
A. applied chlorine
B. residual chlorine
C. sum of applied and residual chlorine
D. difference of applied and residual chlorine
The process in which the chlorination is done beyond the break point is known as_________________?
A. prechlorination
B. post chlorination
C. super chlorination
D. break point chlorination
The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is______________?
A. 1 ppm
B. 4 ppm
C. 10 ppm
D. 40 ppm
The length of rectangular sedimentation tank should not be more than_______________?
A. B
B. 2B
C. 4B
D. 8B
where B is the width of the tank
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