Environmental Engineering Sheet 25
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1) Question.
The following steps are involved in laying a sewer in a trench:
1. Transferring the centre line of the sewer to the bottom of the trench.
2. Setting sight rails over the trench
3. Driving pegs to the level of the invert line of the sewer.
4. Placing the sewer in the trench.
The corect sequence of thethese steps is
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2) Question.
The slope of a 1.0 m diameter concrete sewer laid at a slope of 1 in 1000, develops a velocity of 1 m/s, when flowing full. When it is flowing half-full, the velocity of flow through the sewer will be
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3) Question.
In transition of sewers from smaller diameter sewers to larger diameter sewers, the continuity of sewers is maintained at the
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4) Question.
Septic tank is a
i) settling
ii) digestion tank
iii) aeration tank
The correct answer is
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5) Question.
The means of access for inspection and cleaning of sewer line is known as
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6) Question.
Facultative bacteria are able to work in
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7) Question.
Dissolved oxygen in streams is
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8) Question.
The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is
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9) Question.
Which of the following methods of analysis of water distribution system is most suitable for long and narrow pipe system?
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10) Question.
The activated sludge process of sewage treatment -
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11) Question.
Sludge treatment is mainly done in order to -
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12) Question.
The activated sludge -
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13) Question.
The sewage is treated by aerobic bacteria action in -
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14) Question.
Biological action is used in -
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15) Question.
Grit should be removed from sewage before -
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16) Question.
Grit chambers of a sewage plant are usually changed after -
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17) Question.
In high rate activated sludge treatment, bacterias are removed from -
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18) Question.
In primary settling tank, suspended solids are reduced from -
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19) Question.
The secondary treatment of sewage is carried out by the use of -
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20) Question.
In secondary treatment of sewage, the operation which takes place is -
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