Environmental Engineering Sheet 14
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1) Question.
The rate of filtration in slow sand filters in milion litres per day per hectare is about
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2) Question.
In water treatment, rapid gravity filters are adopted to remove
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3) Question.
The chemical most commonly used to increase speed of sedimentaition of sewage is
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4) Question.
The alum, when added as a coagulant in water
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5) Question.
The detention period in coagulation tanks is usually kept as
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6) Question.
Alum as a coagulant is found to be most effective when pH range of water is
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7) Question.
The amount of coagulation needed for coagulation of water increases with
i) increase in turbidity of water
ii) decrease in turbidity of water
iii) increase in temperature of water
iv) decrease in temperature of water
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8) Question.
If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to
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9) Question.
Orthotolidine test is used for determination of
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10) Question.
The hourly variation factor is usually taken as
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11) Question.
The treatment of water with only chlorine is known as -
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12) Question.
The time of contact for chlorination should be at least -
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13) Question.
The amount of residual chlorine in treated water is determined by the -
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14) Question.
The ideal method of disinfection of swimming pool water is by -
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15) Question.
The most commonly used disinfectant for drinking water throughout the world is -
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16) Question.
The process of killing pathogenic bacterias from water is called -
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17) Question.
Pressure filters are best suited for -
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18) Question.
In pressure filters, water is forced at a pressure.......the atmospheric pressure.
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19) Question.
Pressure filters are not used for treating municipal water supplies, because -
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20) Question.
Rapid sand filter can remove turbidity from water upto an extent of -
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