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Refer to figure.
The diagram shows a typical hydraulic system. Assuming hydraulic pressure throughout and no internal leakage, how will the piston move? The piston..
  • A
    moves to the right due to equal pressure acting on differential areas.
  • B
    moves to the left due to pressure acting on differential areas.
  • C
    is free to move in response to external forces since pressures are equal.
  • D
    will not move as it is hydraulically locked.
The selector valve is in a closed position and, as a result, the fluid is trapped between the piston of the jack and the valve. The piston is unable to move (even when the load is being applied) because the fluid is incompressible and unable to flow through the system. A Hydraulic Lock is said to exist and the piston is locked in its position.

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