Fluid Mechanics
Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the

Fluid velocity in the pipe
Time taken to close the valve
Pipe length
All of these

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Fluid Mechanics
In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of

Relative roughness
All of these
Absolute roughness
Friction co-efficient for flows at equal Reynold number

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Fluid Mechanics
Vane anemometer

Is a variable head meter
None of these
Is an area meter
Rotates an element at a speed determined by the velocity of the fluid in which the meter is immersed

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