Environmental Engineering Sheet 10
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1) Question.
The cleaning of slow sand filter is done by
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2) Question.
An industrial wastewater enters a stream having a BOD concentration of 10 mg/I and a flow of 20 . If the flow of wastewater is 1.5 and its BOD concentration is 250 mg/I, then the BOD concentration in the stream at a point downstream of the point of confluence of wastewater iwth the stream will be
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3) Question.
One litre of sewage, when allowed to settle for 30 minutes gives a sludge volume of . If the dry weight of this sludge is 3.0 grams, then its sludge volume index will be
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4) Question.
The process of lagooning is primarily a means of
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5) Question.
Most of the bacteria in sewage are
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6) Question.
The gas from sludge digestion tank is mainly composed ofAnswer. -
7) Question.
The pipe which is used to carry the discharge from sanitary fittings like bath-rooms, kitchens etc. is called
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8) Question.
In the two-pipe system of house plumbing, the pipes required are
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9) Question.
A pipe which is installed in the house drainage to preserve the water seal of traps is called
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10) Question.
For the same solid content, if the quanity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be
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11) Question.
The efficiency of sedimentation tank for a given discharge, can be increased by -
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12) Question.
The length of rectangular sedimentation tank should not be more than........the width of the tank.
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13) Question.
The velocity of flow in any sedimentation tank should not exceed -
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14) Question.
In the design of a sedimentation tank, the essential factor to be considered is -
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15) Question.
In a plain sedimentation tank, under normal conditions, impurities are removed upto -
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16) Question.
The detention time for an ordinary plain sedimentation tank is -
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17) Question.
The rate of settling of a particle in water depends upon the -
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18) Question.
Plain sedimentation is a process of retaining water in a basin so that the suspended particles settles down as a result of the -
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19) Question.
The area of the openings in screens should be such that the velocity of flow through them does not exceed -
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20) Question.
In the process of screening, the screens should be inclined at an angle of -
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