Ramsay Test Ramsay Hydraulics & Pneumatics 3

Question 1

If a hydraulic cylinder's bore diameter is doubled while pressure stays the same, the force output will:

Accepted Answer

Quadruple

Answer

Force equals pressure times area (F = P × A); doubling the diameter quadruples the circular area, so force increases fourfold.

Question 2

What type of valve permits flow in one direction only and automatically blocks reverse flow?

Accepted Answer

Check valve

Answer

A check valve allows fluid or air to flow in one direction and automatically closes to prevent backflow when flow reverses.

Question 3

Which seal type is most commonly used to prevent internal bypass leakage in hydraulic cylinders?

Accepted Answer

O-ring or piston seal

Answer

O-rings and piston seals maintain a pressure-tight barrier between both sides of the cylinder piston to prevent internal fluid bypass.

Question 4

Cavitation damage in a hydraulic pump is primarily caused by:

Accepted Answer

Insufficient fluid supply or excessive vacuum at the pump inlet

Answer

Cavitation occurs when the pump inlet starves for fluid, forming vapor bubbles that implode violently and erode pump surfaces.

Question 5

What is the primary purpose of a directional control valve in a fluid power circuit?

Accepted Answer

To route fluid flow and control actuator movement direction

Answer

A directional control valve routes pressurized fluid to selected actuator ports, determining which direction the actuator extends or retracts.

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