Hydraulic and Pneumatic Power Systems Flashcards

1
Q

What materials form the bases of the three types of hydraulic fluids?

A

Vegetable, mineral, and Phosphate-esters.

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2
Q

What colors denote mineral-based and phosphate-ester-based hydraulic fluids?

A

Mineral based fluids are red and phosphate-ester based fluids are light purple.

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3
Q

What are the results of exposing lacquers, oil-based paint, plastic resins, and vinyl compounds to phosphate-ester-based hydraulic fluid?

A

The materials will be damaged and/or softened, or the paint will peel.

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4
Q

Name several sources used to develop hydraulic pressure.

A

Hand pumps, engine-driven pumps, and electrically driven pumps.

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5
Q

What would cause the bypass valve in a hydraulic filter to open and allow unfiltered fluid to circulate in the system?

A

A clogged filter element.

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6
Q

Describe several methods of pressurizing a hydraulic reservoir.

A

Engine bleed air, system pressure acting on a small piston in the reservoir, using variable-displacement hydraulic pumps.

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7
Q

What feature prevents engine damage if an engine-driven hydraulic pump seizes or is overloaded?

A

A shear section in the pump driveshaft will break, disconnecting the pump from the engine.

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8
Q

Describe the purpose of a pressure relief valve.

A

Pressure relief valves limit the maximum pressure produced by the pump, thereby preventing failures of the system components.

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9
Q

Engine-driven pumps deliver the output fluid flow in what two forms?

A

As a constant volume or a variable volume.

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10
Q

Describe the operation of a gear-type pump.

A

Two meshed gears, driven by a power source, rotate in a housing. Inlet fluid is carried around the outside of the gears and delivered to the outlet side as the gears rotate.

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11
Q

Describe the purpose of a pressure regulator.

A

Pressure regulators manage the output of the pump to maintain system pressure. They allow the pump to be unloaded so it turns without significant resistance.

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12
Q

What is the device that is used in some systems to supplement the pump output during periods of high demand?

A

An accumulator.

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13
Q

What are the three different types of accumulators?

A

Piston, diaphragm, and bladder.

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14
Q

What safety precautions must be taken prior to disassembling an accumulator?

A

Release all of the air or preload.

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15
Q

When a hydraulic unit is replaced, what precautions should be taken to avoid contamination of the system?

A

All lines should be capped or plugged immediately after they are disconnected.

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16
Q

What types of components or systems are pneumatically operated in some aircraft?

A

Landing gear, brakes, flaps, and other mechanical actuators.

17
Q

Name several sources of pneumatic power.

A

Storage bottles, engine bleed air, engine-driven compressors or vane-type pumps.

18
Q

What happens to excess pressure in a pneumatic system?

A

A relief valve vents it overboard.

19
Q

What is the function of a restrictor in a pneumatic system?

A

To control the rate of flow of the airflow.

20
Q

What are the reasons for periodically purging a pneumatic system?

A

To remove moisture and contaminants.