Ramsay Test Ramsay Hydraulics & Pneumatics 4

Question 1

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

Accepted Answer

Excessive back pressure in the return line

Answer

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

Question 2

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

Accepted Answer

Add oil mist to lubricate downstream components

Answer

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

Question 3

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

Accepted Answer

Flow control valve

Answer

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

Question 4

A double-acting pneumatic cylinder requires air to:

Accepted Answer

Both ports alternately to extend and retract under power

Answer

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

Question 5

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

Accepted Answer

Increased internal leakage past seals and pump clearances

Answer

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

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