HomeWork 2
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| Large transport category aircraft hydraulic systems produce around 500 P.S.I. of pressure True, False | False
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| Both a high flash point and a high fire point are desirable for hydraulic fluids. True, False | true
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| The only contaminants that really affect a hydraulic system are abrasive type contaminants (ex. sand, rust, and machine chips) affect a hydraulic system True, False | False
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| If the system becomes contaminated, it must be purged immediately. True, False | False
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| Basic hydraulic systems have one of the following: directional valve check valve, pressure relief valve, or selector valve. True. False | False
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| A hydraulic power pack does not require a centralized hydraulic power supply or long hydraulic lines. True, False | True
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| Pressurized reservoirs use quantity transmitters to gauge fluid quantity in the system. True, False | False
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| The micron element is designed to prevent passage of solids greater than 1 micron in size. True, False | False
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| Thermal lockout devices incorporated into some button indicators prevent operation of the indicator below a certain temperature. True, False | True
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| Most modern power driven pumps are variable-delivery, compressor-control type. True, False | False
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| All aircraft axial piston pumps have an odd number of pistons (5, 7, 9, etc. True, False | True
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| When the pump outlet pressure of a Vickers variable delivery pump is below 2850 psi, it is held at its maximum angle in relation with the drive shaft centerline by the force of the yoke return spring. True, False | True
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| There are two types of in-line check valves; simple-type and orifice-type. True, False | True
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| Automatic setting fuses are designed to allow a certain volume of fluid per minute to pass through.) True, False | True
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| An accumulator is a steel sphere divided into chambers by a rubber diaphragm. True, False | True
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| What are the main subsystems of every hydraulic system? Pump. revivor, accumulator, heat exchanger,, and filtering system, Pump, transfer pump, reservoir. heat exchanger, and filtering system., Pump, reservoir, filtering system, condenser unit, and filtering system, Pump, carburetor, accumulator, heater exchanger, and filtering system. | Pump. revivor, accumulator, heat exchanger,, and filtering system
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| Which states that pressure applied to any part of a confined liquid is transmitted with equal intensity to every other part? Archimedes, Pavlov's Law, Pascal's Law | Pascal's Law
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| Which are properties that should be considered when choosing a fluid for a given hydraulic system? Viscosity, Chemical stability, Flash point, All of the above | All of the above
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| Which of the following seals is not compatible with skydroll? Neoprene and Buna-N, Butyl rubber and Buna-N, Neoprene and ethylene-propylene, Butyl rubber and ethylene-propylene | Neoprene and Buna-N
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| During maintenance and servicing procedures, all parts should be washed in ? Solvent, MEK Soap and water, Water only | Solvent
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| Where are filters installed in the system? Pressure lines, Return lines, Pump case drain lines, All of the above | All of the above
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| An open center system is one that has fluid flow? Unpressurized using a power pump., Under pressure using a power pump., And pressure in the system when the actuating mechanism is idle, And no pressure in the system when the actuating mechanism is idle | And no pressure in the system when the actuating mechanism is idle
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| If a constant delivery pump is used in a closed system, how is the system pressure regulated? Pump's integral pressure mechanism., Pressure regulator., Relief valve. | Pressure regulator
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| What is the advantage of an open system over a closed system? Continuous pressurization., Faster operating of the system, Gradual pressure build up., None of the above. | Gradual pressure build up
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| What is/are the functions of a reservoir? Overflow basin. Purges air bubbles Heats fluid, A and B are correct. | A and B are correct
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