Question

Hydraulic press is based upon :-

• A. Archimede's principle
• B. Bernoulli's theorem
• C. Pascal's law
• D. Reynold's number

Answer 1

Answer: (C)

Pascal's law

Hydraulic press works on Pascal's principle, which states - “pressure throughout a closed system is constant.”

In hydraulic press, there is a piston at one end of the system having a small cross-sectional area. This piston is driven by a lever. The other end of the system has small-diameter tubing.

When a fluid is displaced, either of the pistons is pushed inward. Small piston displaces a smaller amount of volume than the large piston for a given distance of movement. The displaced fluid volume is proportional to the ratio of pistons' head areas. Hence, smaller piston moves a large distance to move large piston significantly. The large piston movement distance is equal to small piston movement distance divided by the ratio of the pistons' head areas.