Online Civil Engineering Test - Waste Water Engineering Test

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Total number of questions: 20.
Time allotted: 30 minutes.
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In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is

2.25

2.50

2.55

2.65

2.75

[#]

The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

[#]

In SI units the power of sound is represented in

kgs

joules

neutons

watts.

[#]

For evaporation and measurement of settlable solids, the apparatus used, is

a jar

a breaker

a test tube

an Imhoff cone.

[#]

Disposal to sewage in large cities, is done in

irrigation

dilution

oxidation

putrifaction.

[#]

In sewers the gas generally found, is

Hydrogen sulphide (H₂S)

Carbon dioxide (CO₂)

Methane (CH₄)

Petrol vapours

All the above.

[#]

In case of Imhoff tanks,

the shape is rectangular

detention period is 2 hours

the velocity of flow is restricted to 0.30 m/minute

surface loading is limited to 30, 000 litres/m of plan area per day

All the above.

[#]

Which one of the following tests is used for testing sewer pipes :

water test

ball test

mirror test

all of these.

[#]

Rate of flow of sewage is generally assumed

more than the rate of water supply

equal to the rate of water supply

less than the rate of water supply

at 150 litres per capita.

[#]

10.

Dry water flow in a combined sewer, is

industrial sewage

domestic sewage

storm water

inclusive of domestic and industrial sewage but excludes storm water.

[#]

11.

Primary treatment of sewage consists of removal of

large suspended organic solids

oil and grease

sand and girt

floating materials

none of these.

[#]

12.

Which one of the following part of human body withstands minimum radiation

thyroid

kidneys

eyes

ovaries/testis.

[#]

13.

The self-cleansing velocity of water flowing through pipe lines, is

2 metres/sec

1 metre/sec

0.5 metre/sec

0.25 metre/sec.

[#]

14.

If D is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is

1.250 D

1.350 D

1.425 D

1.625 D.

[#]

15.

The sewerage system consists of

house sewer

lateral sewer

branch sewer

main sewer

all of these.

[#]

16.

The laying of sewers is done with

magnetic compass

theodolite

level

clinometer

plane table.

[#]

17.

In the activated sludge process

aeration is continued till stability

aeration is done with an admixture of previously aerated sludge

sludge is activated by constant stirring

water is removed by centrifugal action.

[#]

18.

In a trickling filter

filtration process is used

biological action is used

neither (a) nor (b)

both (a) and (b).

[#]

19.

In a grit chamber of a sewage treatment plant,

flow velocity 0.15 m to 0.3 m/sec is kept

depth of 0.9 m to 1.20 m is kept

one minute of detention period is kept

all the above.

[#]

20.

The most efficient cross-section of sewers in a combined sewerage system is

parabolic

circular

rectangular

new egged.

[#]

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Online Civil Engineering Test - Waste Water Engineering Test

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