For sewers, inverted siphon is provided for

An inverted siphon is designed generally for

A

One pipe

B

Two pipes

C

Three pipes

D

Four pipes

To avoid an interruption in the flow of a siphon, an air vessel is provided

A

At the inlet

B

At the outlet

C

At the summit

D

At any point between inlet and outlet

An air vessel is provided at the summit in a siphon to

A

Avoid interruption in the flow

B

Increase discharge

C

Increase velocity

D

Maintain pressure difference

The drop man holes are generally provided in sewers for

A

Industrial areas

B

Large town ships

C

Hilly town ships

D

Cities in plains

The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid.

A

Equal to

B

Less than

C

More than

D

None of these

The discharge through a siphon spillway is

A

$${{\text{C}}_{\text{d}}} \times {\text{a}}\sqrt {2{\text{gH}}} $$

B

$${{\text{C}}_{\text{d}}} \times {\text{a}}\sqrt {2{\text{g}}} \times {{\text{H}}^{\frac{3}{2}}}$$

C

$${{\text{C}}_{\text{d}}} \times {\text{a}}\sqrt {2{\text{g}}} \times {{\text{H}}^2}$$

D

$${{\text{C}}_{\text{d}}} \times {\text{a}}\sqrt {2{\text{g}}} \times {{\text{H}}^{\frac{5}{2}}}$$

The self cleansing velocity for all sewers in India is usually

A

Less than 1.0 m/sec

B

1.0 m/sec to 1.2 m/sec

C

1.5 m/sec to 2.0 m/sec

D

3.0 m/sec to 3.5 m/sec

The main disadvantage of cement concrete sewers is

A

Less strength

B

Difficulty in construction

C

Difficulty in transportation due to heavy weight

D

Less life

A sewer that receives the discharge of a number of house sewers is called

A

House sewer

B

Lateral sewer

C

Intercepting sewer

D

Sub-main sewer

Laying of sewers is usually done with the help of

A

A Theodolite

B

A compass

C

Sight rails and boning rods

D

A plane table

For sewers, inverted siphon is provided for

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