Ramsay Hydraulics & Pneumatics Flashcards

A hydraulic cylinder is extending slower than normal despite correct pump flow. What is the MOST likely cause?

Answer: Excessive back pressure in the return line

Excessive back pressure in the return line restricts fluid from leaving the rod end, slowing the extension stroke.

In a pneumatic system, a lubricator is placed in the air line to:

Answer: Add oil mist to lubricate downstream components

A lubricator introduces a fine oil mist into the air stream to reduce wear on valves, cylinders, and other moving components.

Which type of hydraulic valve controls the RATE of fluid flow to an actuator?

Answer: Flow control valve

A flow control valve meters the volume of fluid passing through it, directly determining the speed of the actuator.

A double-acting pneumatic cylinder requires air to:

Answer: Both ports alternately to extend and retract under power

A double-acting cylinder uses compressed air applied to alternate ports to produce powered motion in both directions.

Hydraulic fluid viscosity that is TOO LOW will most likely cause:

Answer: Increased internal leakage past seals and pump clearances

Thin (low-viscosity) fluid slips past internal clearances and seals, reducing volumetric efficiency and causing internal leakage.

What does the term 'CFM' refer to in a pneumatic system?

Answer: Cubic feet per minute — a measure of air flow volume

CFM (cubic feet per minute) is the standard US unit for measuring volumetric air flow rate in pneumatic systems.

In a hydraulic system, an accumulator is used to:

Answer: Store hydraulic energy and dampen pressure spikes

An accumulator stores pressurized fluid (using gas precharge) to supplement pump flow on demand and absorb pressure surges.