NCED Hydraulic & Pneumatic Systems 2

Question 1

Pascal's Law states that pressure applied to a confined fluid is transmitted:

Accepted Answer

Equally in all directions

Answer

Pascal's Law states that pressure applied to a confined, incompressible fluid is transmitted equally and undiminished in all directions.

Question 2

In a hydraulic system, if a piston with a 2 sq in area receives 500 psi, what force is exerted?

Accepted Answer

1000 lbs

Answer

Force equals pressure multiplied by area (F = P × A), so 500 psi × 2 sq in = 1000 lbs.

Question 3

Which property of hydraulic fluid most directly affects system efficiency at high temperatures?

Accepted Answer

Viscosity

Answer

Viscosity decreases as temperature rises, causing leakage past seals and reduced pump efficiency in hydraulic systems.

Question 4

A double-acting hydraulic cylinder differs from a single-acting cylinder in that it:

Accepted Answer

Can exert force in both extension and retraction strokes

Answer

A double-acting cylinder has hydraulic ports on both sides of the piston, allowing pressurized fluid to drive the rod in both directions.

Question 5

What is the primary purpose of a hydraulic accumulator?

Accepted Answer

Store pressurized fluid for supplemental flow or energy recovery

Answer

A hydraulic accumulator stores pressurized fluid that can be released to supplement pump flow during peak demand or recover energy.

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