The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called

If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains

A

Hydrogen sulphide

B

Carbon dioxide

C

Methane

D

Oxygen

The total energy line lies over the hydraulic gradient line by an amount equal to the

A

Pressure head

B

Velocity head

C

Pressure head + velocity head

D

Pressure head - velocity head

The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the

A

Pressure head

B

Velocity head

C

Pressure head + velocity head

D

Pressure head - velocity head

Which of the following CSS Gradient Functions sets the direction and colors of a gradient that fades from one color to the next in a straight line?

A

gradient()

B

line-gradient()

C

linear-gradient()

D

none of the mentioned

If the height of the hydraulic gradient line above the floor of thickness t is h and the specific gravity of the material of the floor is G, the minimum thickness t of the floor downstream of the crest-wall, is given by the equation

A

$${\text{t}} = \frac{{{\text{h}} + 1}}{{{\text{G}} + {\text{t}}}}$$

B

$${\text{t}} = \frac{{{\text{h}} - 1}}{{{\text{G}} + {\text{t}}}}$$

C

$${\text{t}} = \frac{{{\text{h}} - 1}}{{{\text{G}} - {\text{t}}}}$$

D

$${\text{t}} = \frac{{{\text{h}} + 1}}{{\text{G}}}$$

The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is

A

Equal to HMD when flowing full

B

Less than HMD when flowing full

C

Greater than HMD when flowing full

D

None of the above

The slope of the obstruction clearance line from the boundary of the heliport should be

A

1 : 2

B

1 : 5

C

1 : 8

D

1 : 40

A typist can type 125 pages, 36 lines cach, 11 words in each line in 5 days. How many pages of 30 lines each and 12 words to each line can he type in 6 days?

A

160

B

165

C

170

D

175

Drop manholes at the junctions of sewer lines, are provided if

A

Invert level of a branch sewer is more than 60 cm that of the main sewer

B

Sewer line runs along a main road

C

Ordinary manhole cannot be built

D

Two sewer lines intersect

In case of sewer lines

A

Water test is carried out to check water tightness of the joints

B

Test for straightness is carried out with the help of a lamp and mirror

C

Obstruction test is carried out with the help of smooth ball of diameter 13 mm

D

All the above

The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called

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