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

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

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 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

The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the sub-merged body is called

A

upthrust

B

reaction

C

buoyancy

D

metacentre

The uplift pressure on the face of a drainage gallery in a dam is taken as

A

hydrostatic pressure at toe

B

average of hydrostatic pressure at toe and heel

C

two-third of hydrostatic pressure at toe plus one-third of hydrostatic pressure at heel

D

none of the above

The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the submerged body is called

A

Up-thrust

B

Reaction

C

Buoyancy

D

Metacentre

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

In a syphon aqueduct

A

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

B

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

C

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

D

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

In a canal syphon, the flow is

A

Under atmospheric pressure

B

Pipe flow

C

With critical velocity

D

Under negative pressure

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

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