The laying of sewers is done with

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

Which one of the following tunneling methods is used for laying underground sewers?

A

Needle beam method

B

Army method

C

German method

D

Italian method

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

The minimum and maximum diameters of sewers shall preferably be

A

15 cm and 100 cm

B

15 cm and 300 cm

C

30 cm and 450 cm

D

60 cm and 300 cm

With self cleansing velocity in sewers

A

Silting occurs at bottom

B

Scouring occurs at bottom

C

Both silting and scouring occur at bottom

D

Neither silting nor scouring occurs at bottom

For trunk and out-fall, the type of sewers generally used, is

A

Standard egg shaped

B

Circular shaped

C

Horse shoe shaped

D

Parabolic shaped

Clogging of sewers, is caused due to

A

Silting

B

Low discharge

C

Greasy and oily matters

D

All the above

Are available in size Stoneware sewers

A

10 cm

B

15 cm

C

20 cm

D

All the above

The laying of sewers is done with

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