To store pressure energy which may be supplied to a machine later on

to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure

to lift larger load by the application of a comparatively much smaller force

all of the above

Air lift pump

Jet pump

Hydraulic coupling

Hydraulic press

Strain

pressure

kinetic

none of the above

Hydraulic ram

Hydraulic intensifier

Hydraulic torque converter

Hydraulic accumulator

power absorbing machines

power developing machines

energy transfer machines

energy generating machines