Amazon Maintenance Technician Hydraulics & Pneumatics Systems 2

Question 1

What condition is indicated by milky or cloudy hydraulic fluid?

Accepted Answer

Water or air contamination in the fluid

Answer

Milky or cloudy hydraulic fluid indicates water contamination or aeration, both of which reduce lubrication and can cause cavitation.

Question 2

What is cavitation in a hydraulic pump, and what typically causes it?

Accepted Answer

Formation and collapse of vapor bubbles caused by low inlet pressure

Answer

Cavitation occurs when inlet pressure drops below the fluid's vapor pressure, forming bubbles that collapse violently and erode pump components.

Question 3

In a pneumatic system, what is the purpose of the lubricator in the FRL unit?

Accepted Answer

Inject oil mist to lubricate downstream components

Answer

The lubricator in the Filter-Regulator-Lubricator unit injects a fine oil mist into the air stream to lubricate valves, cylinders, and other pneumatic components.

Question 4

Which type of hydraulic cylinder produces force in one direction and relies on gravity or a spring for the return stroke?

Accepted Answer

Single-acting cylinder

Answer

A single-acting cylinder applies hydraulic force in one direction only; the return is accomplished by spring tension or gravity.

Question 5

What OSHA standard governs the lockout/tagout of hydraulic energy sources before maintenance?

Accepted Answer

29 CFR 1910.147

Answer

OSHA 29 CFR 1910.147, the Control of Hazardous Energy standard, requires hydraulic systems to be de-energized and depressurized before maintenance work begins.

Amazon Practice Test

Amazon Practice Test

Amazon Maintenance Technician Hydraulics & Pneumatics Systems 2