Environmental Engineering Sheet 24
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1) Question.
Consider the following statements:
Some amount of chlorides is allowed in drinking water because
1. it helps in killing bacteria
2. small quantity of chlorides adds to the taste
3. it, is not injurious to human health
4. it is not economical to remove it completely.
Which of these statements are correct?
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2) Question.
Consider the following statements :
The daily per capita consumption of water apparently increases with
1. higher standard of living of people
2. availability of sewerage in the city
3. metered water supply
4, wholesome and potable quality of water
Which of these statements are correct?
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3) Question.
Fresh sludge has moisture content of 99% and, after thickening, its moisture content is reduced to 96%. The reduction in volume of sludge is
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4) Question.
The following three stages are known to occur in the the biological action involved in the process of sludge digestion:
1. Acid fermentation
2. Alkaline fermentation
3. Acid regression
The correct sequence of theese stages is
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5) Question.
Self-purification of running streams may be due to
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6) Question.
If the sewage contains grease and fatty oils, these are removed in
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7) Question.
Corrosion in concrete sewers is caused by
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8) Question.
Laying of sewers is usually done with the help of
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9) Question.
Sewage treatment units are disigned for
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10) Question.
Seerage system is designed for
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11) Question.
In preliminary treatment of sewage, the operation which takes place, is -
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12) Question.
The percentage ratio of the oxygen available in sewage to the oxygen required to satisfy one stage of bio-chemical oxygen demand (B.O.D.) is termed as -
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13) Question.
The amount of oxygen consumed by sewage from an oxidising agent like potassium dichromate is termed as -
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14) Question.
The bio-chemical treatment of sewage effluent is a process of -
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15) Question.
The minimum dissolved oxygen required in water to save the aquatic life is -
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16) Question.
The natural process in which the oxygen of water of streams is consumed by sewage and at the same time, it is replenished(filled again) by the atmosphere, is known as -
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17) Question.
When the sewage is to be distributed over a level area surrounded by dykes(i.e. trenches), the method of sewage used is called -
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18) Question.
Disposal by dilution will be suitable where -
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19) Question.
Land disposal of sewage will be favourable where -
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20) Question.
The equipment used for cleaning the sewers easily is called -
Answer.
