Civil Waste Water Engineering Part-1

Test Preparation on Civil Waste Water Engineering Part-1

1.

For a continuous flow type of sedimentation tanks

1Width of the tank is normally kept about 6 m
2Length of the tank is normally kept 4 to 5 times the width
3Maximum horizontal flow velocity is limited to 0.3 m/minute
4All the above

2.

The asbestos cement sewers are

1Light in weight
2Not structurally strong to bear large compressive stress
3Susceptible to corrosion by sulphuric acid
4All the above

3.

For efficient working of a sewer, it must be ensured that

1Minimum velocity of 0.45 m/sec, is maintained at its minimum flow
2A maximum velocity of 0.90 m/sec, is maintained at its maximum flow
3Both 1 and 2
4Neither 1 nor 2

4.

Pick up the correct statement from the following:

1The sewer pipes of sizes less than 0.4 m diameter are designed as running full at maximumdischarge
2The sewer pipes of sizes greater than 0.4 m diameter are designed as running 2/3rd or 3/4thfull at maximum discharge
3The minimum design velocity of sewer pipes is taken as 0.8 m/sec
4All the above

5.

Pick up the correct statement from the following:

1Maximum daily flow = 2 times the average daily flow
2Maximum daily flow = 2/3
3Sewers are designed for minimum permissible velocity at minimum flow
4All the above

6.

Bottom openings 15 cm

115 cm c/c
222.5 cm c/c
330 cm c/c
450 cm c/c

7.

The pressure exerted by

1The sewage when running full from inside, is called internal pressure
2The internal pressure if any, causes tensile stress in the pipe material
3Pressure sewers are designed to be safe in tension
4All the above

8.

For drainage pipes in buildings the test applied before putting them to use, is

1Water test
2Smoke test
3Straightness test
4All the above

9.

No treatment of the sewage is given if dilution factor is

1Less than 150
2Between 150 to 200
3Between 200 to 300
4More than 500

10.

Which of the following pumps in used to pump sewage solids with liquid sewage without cloggingthe pump is?

1Centrifugal pump
2Pneumatic ejector
3Reciprocating pump
4None of these

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