Hydraulic and Pneumatic Power Systems Flashcards

1
Q

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

A

Vegetable, Mineral, and phosphate-esters

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2
Q

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

A

Mineral base 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 pump, engine-driven pump, 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, or 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 gear rotate

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11
Q

Describe the purpose of a pressure regulator?

A

Pressure regulator 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 dissembling 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 in 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 bottle, engine bleed air, engine driven compressors or vane-type pumps

18
Q

What happens to excess pressure in 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