Canal passes over the drainage and H.F.L. of the drainage is above the bottom of the canal trough

Drainage passes over the canal and F.S.L. of the canal is below the bottom of the drainage trough

Drainage passes over the canal and F.S.L. of the canal is above the bottom of the drainage trough

Canal passes over the drainage and H.F.L. of the drainage is below the bottom of the canal trough

In a syphon aqueduct

The velocity of drainage water in the barrels of a syphon-aqueduct, is normally limited to

A

1 to 2 m per second

B

2 to 3 m per second

C

3 to 4 m per second

D

4 to 5 m per second

The level of the floor of a syphon aqueduct can be obtained

A

By subtracting the depth of the culvert from the canal bed level

B

By subtracting the thickness of culvert plus the depth of the culvert from the canal bed level

C

Both (A) and (B)

D

None of these

The structure constructed to allow drainage water to flow under pressure through an inverted syphon below a canal, is called

A

Syphon

B

Super passage

C

Super-aqueduct

D

Syphon aqueduct

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

A

at the inlet

B

at the outlet

C

at the summit

D

ay nay point between inlet and outlet

The uplift pressure on the roof of an inverted syphon, is maximum when

A

Drain in running dry

B

Canal is running dry

C

Canal is running with F.S.L.

D

Drain is running with H.F.L.

The pressure at the summit of a syphon is

A

equal to atmospheric

B

less than atmospheric

C

more than atmospheric

D

none of the above

In a canal syphon, the flow is

A

Under atmospheric pressure

B

Pipe flow

C

With critical velocity

D

Under negative pressure

Pressure gauges are never connected directly to the live steam line; rather a loop or syphon is interposed as close as possible to the pressure gauge. This is done to

A

Avoid the overheating of the tubes & bellows which operate them to minimise error and damage

B

Form a seal of water by steam condensate to fill the tube or bellows at the pressure being measured

C

Both 'A' & 'B'

D

Avoid the static head error introduced by steam entry

The aqueduct or superpassage type of works are generally used when

A

high flood drainage discharge is small

B

high flood drainage discharge is large and short lived

C

high flood drainage discharge is large and continues for a long time

D

none of the above

In a syphon aqueduct

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