Environmental Engineering Sheet 13
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1) Question.
If the diameter of the main pipe is taken less than economic diameter then
1. head loss will be high
2. cost of pipe will be less
3. cost of pumping will be less
Of these statements
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2) Question.
The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by
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3) Question.
Standard BOD is measured at
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4) Question.
Settling velocity increases with
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5) Question.
Sewage treatment units are normally designed for
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6) Question.
Which of the following retards the self purification of stream?
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7) Question.
The pathogens can be killed by
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8) Question.
The characteristics of fresh and septic sewage respectively are
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9) Question.
The type of sewer which is suitable for both combined and separate system is
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10) Question.
The most commonly used sewer under culverts is
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11) Question.
The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is
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12) Question.
Rapid sand filter can remove bacterias upto an extent of -
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13) Question.
Cleaning period for a rapid sand filter is taken as -
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14) Question.
Cleaning of rapid sand filters is done by -
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15) Question.
In a rapid sand filter, the filter head varies from -
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16) Question.
An arrangement for back washing is provided in -
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17) Question.
The yield of a rapid sand filter is.......to that of slow sand filter.
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18) Question.
In a rapid sand filter -
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19) Question.
Slow sand filter is efficient to remove the bacterias from the raw water to an extent of -
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20) Question.
Slow sand filter is more efficient for the removal of -
Answer.
