Cement concrete sewers are only suitable if non-scouring velocity is between

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

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 testing compressive and tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of

A

1 : 2

B

1 : 3

C

1 : 4

D

1 : 6

Corrosion in concrete sewers is caused by

A

Septic conditions

B

Dissolved oxygen

C

Chlorine

D

Nitrogen

The suitable cross-section of sewers to carry combined flow, is

A

Circular

B

Egg shaped

C

Rectangular

D

Horse shoe shaped

The maximum shear stress (q) in concrete of a reinforced cement concrete beam is

A

$$\frac{{{\text{Shear force}}}}{{{\text{Lever arm}} \times {\text{Width}}}}$$

B

$$\frac{{{\text{Lever arm}}}}{{{\text{Shear force}} \times {\text{Width}}}}$$

C

$$\frac{{{\text{Width}}}}{{{\text{Lever arm}} \times {\text{Shear force}}}}$$

D

$$\frac{{{\text{Shear force}} \times {\text{Width}}}}{{{\text{Lever arm}}}}$$

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

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

In sewers designed with self cleansing velocity,

A

The bottom is silted

B

The bottom is scoured

C

Both silting and scouring occur at the bottom

D

Neither silting nor scouring occurs at the bottom

In sewers the velocity of flow should not be

A

More than the self-cleansing velocity

B

Less than the self-cleansing velocity

C

Less than 10 m/sec

D

More than 20 m/sec

Cement concrete sewers are only suitable if non-scouring velocity is between

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