Environmental Engineering Sheet 22
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1) Question.
The following reactions take place during anaerobic digestion of organics:
1. methane production
2. alkaline fermentation
3. acid fermentation
4. acid regression
The correct sequence of these reactions is
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2) Question.
An aeration basin with a volume of contains mixed liquor with suspended solid concentration of 1000 mg/I. The amount of mixed liquor suspended solids in the tank is
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3) Question.
Various unit operations exist in a sewage treatment plant. These would include
1. screening
2. grit removal
3. secondary sedimentation
4. aeration
5. primary sedimentation
The correct sequence of these operations is
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4) Question.
For the combined sewerage system, eggshaped sewers are preferred because
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5) Question.
Under natural conditions of flow, an unpolluted river would contain
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6) Question.
The ideal residual pressure at the farthest consumer's tap in a properly designed water distribution system is in the range of
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7) Question.
Consider the following statements:
In water supply distribution network, the dead-end system is not favoured because
1. it is cumbersome in terms of design.
2. the pressure at the dead-ends becomes undesirable low in the case of additional extensions.
3. it is difficult to maintain residual chlorine levels at the dead-ends.
4. at the time of repairs, service connections beyond the point of repair are deprived of water.
Of these statements
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8) Question.
A city supply of 15 cubic metres of water per day is treated with a chlorine dosage of 0.5 ppm. For this purpose, the requirement of 25% bleaching power per day would be
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9) Question.
Electostatic precipitators are used as pullution control device for the separation of
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10) Question.
The intensification of green hourse effect is attributed to the increased level of
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11) Question.
In one pipe system of plumbing, waste water is carried away from -
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12) Question.
In one pipe system of plumbing -
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13) Question.
Ventilation of house drainage is required to -
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14) Question.
A good trap should -
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15) Question.
The equipment used for checking the levels of the sewer inverts is -
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16) Question.
A drop manhole is provided if -
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17) Question.
Manholes on sewer lines are provided for -
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18) Question.
The minimum diameter of a manhole cover should be -
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19) Question.
The lower portion of a manhole is known as -
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20) Question.
For large sewers, the maximum distance between manholes should be -
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