WASTE WATER ENGINEERING QUIZ

Pick up the incorrect size of stone ware sewers

52.5 cm

67.5 cm

None of these

82.5 cm

TRUE ANSWER : ?
YOUR ANSWER : ?

A manhole is classified as shallow if its depth is between

0.7 to 0.9 m

0.9 to 1.20 m

0.4 to 0.5 m

0.5 to 0.7 m

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YOUR ANSWER : ?

During preliminary treatment of a sewage

Oil and grease are removed from skimming tanks

Floating materials are removed by screening

All listed here

Girt and sand are removed by girt chambers

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Large diameter sewers subjected to external pressure alone, are reinforced

With elliptical cage

Near the outer surface of the pipe

Both A and B

Near the inner surface of the pipe

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The temperature affects the

Biological activity of bacteria in sewage

Viscosity of sewage

All of these

Solubility of gases in sewage

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YOUR ANSWER : ?

The most widely used pump for lifting sewage is

Air pressure pump

Reciprocating pump

Centrifugal pump

Pneumatic ejector

TRUE ANSWER : ?
YOUR ANSWER : ?

The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is

20 cm

25 cm

40 cm

50 cm

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Lead acetate test in sewer manhole is done to test the presence of

Hydrogen sulphide

Carbondioxide gas

Diesel vapours

Methane gas

TRUE ANSWER : ?
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Hydraulic mean radius is

Difference in heads between two points in circular pipes

Cross-sectional area/wetted perimeter

Mean of radii in a pipe line of varying cross -sections

Mean radius of sewer

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A drop manhole is provided if

None of these

A sewer drops from a height

A lamp is inserted to check obstruction

A branch sewer joins the main sewer at higher level

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