Bottom openings 15 cm × 15 cm in the standing baffle wall are provided________________?

The asbestos cement sewers are_________________?

A. Light in weight

B. Not structurally strong to bear large compressive stress

C. Susceptible to corrosion by sulphuric acid

D. All the above

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

A. Water test

B. Smoke test

C. Straightness test

D. All the above

For a continuous flow type of sedimentation tanks__________________?

A. Width of the tank is normally kept about 6 m

B. Length of the tank is normally kept 4 to 5 times the width

C. Maximum horizontal flow velocity is limited to 0.3 m/minute

D. All the above

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

A. Minimum velocity of 0.45 m/sec, is maintained at its minimum flow

B. A maximum velocity of 0.90 m/sec, is maintained at its maximum flow

C. Both A. and B.

D. Neither A. nor B.

The pressure exerted by_____________?

A. The sewage when running full from inside, is called internal pressure

B. The internal pressure if any, causes tensile stress in the pipe material

C. Pressure sewers are designed to be safe in tension

D. All the above