Hydraulics and Fluid Mechanics in ME
A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if

Length of both the pipes is same
Diameter of both the pipes is same
Loss of head and discharge of both the pipes is same
Loss of head and velocity of flow in both the pipes is same

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Hydraulics and Fluid Mechanics in ME
In a reaction turbine, the draft tube is used

To prevent air to enter the turbine
To transport water to downstream
To run the turbine full
To increase the head of water by an amount equal to the height of the runner outlet above the tail race

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Hydraulics and Fluid Mechanics in ME
A hydraulic press is a device used

To store pressure energy which may be supplied to a machine later on
To lift larger load by the application of a comparatively much smaller force
All of these
To increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure

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