Environmental Engineering Sheet 11
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1) Question.
When there is no recirculation of sewage, then recirculation factor is
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2) Question.
For normal sludge, the value of sludge index for Indian conditions is
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3) Question.
Sludge volume index is defined as the ratio of
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4) Question.
For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as
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5) Question.
The main disadvantage of oxidation pond is that
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6) Question.
Composting and lagooning are the methods of
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7) Question.
The detention period for oxidation ponds is usually kept as
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8) Question.
In faculative stabilization pond, the sewage is treated by
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9) Question.
The working conditions in imhoff tanks are
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10) Question.
The maximum efficiency of BOD removal is achieved in
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11) Question.
The effective size of sand particles for slow sand filters varies from -
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12) Question.
The sand used for filteration, should not loose weight more than........ when placed in hydrochloric acid for 24 hours.
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13) Question.
The organic impurities in water form a layer on the top of a filtering media. Such a layer is called -
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14) Question.
The void spaces in the filtering material act like a -
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15) Question.
The process of purifying water by passing it through a bed of fine granular material, is called -
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16) Question.
The volume of a settling basin is large due to -
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17) Question.
The alum when mixed with water as a coagulant -
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18) Question.
Which of the following is not a coagulating agent? -
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19) Question.
In dry feeding type of coagulants, the dose of coagulant is controlled by -
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20) Question.
The most common coagulant is -
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