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hydraulic test 2
| Question | Answer |
|---|---|
| to prevent external and internal leakage in aircraft hydraulic units, the most commonly used type of seal is ? | O-ring |
| Which allows free fluid flow in one direction and no fluid flow in the other direction? | Check Valve |
| Valve used in a hydraulic system that directs pressurized fluid to one end of actuator while simultaneously directs return fluid to the reservoir from the other end | selector valve |
| relief valves are used in pneumatic systems as? | preventing damage units |
| One of the distinguishing characteristics of an open center selector valve used in a hydraulic system is? | It allows continuous flow does not build up pressure |
| what type of packings should be used on hydraulic components containing skydrol? | Phosphate estra base |
| Relief valves are used in pneumatic systems. | TRUE |
| The removal of air from an hydraulic system is generally accomplished by? | operating system |
| The component in the hydraulic system that is used to direct the flow of fluid is the? | Selector valve |
| The purpose of the pressure regulator in a hydraulic system is to? | regulate pressure |
| A flexible sealing element subject to motion is a | O-ring |
| Which characteristic apply to aircraft hydraulic system? | 100% efficient, easy to maintain, light weight, easy to inspect. |
| Extrusion of an o-ring seal is prevented in a high-pressure system by use of a | Back up ring |
| What is one advantage of a psiton-type hydraulic motors over electric motors? | No spark |
| Generally, the first step in removing an accumulator from an aircraft is to? | relieve pressure |
| if a hydraulic brake system uses packing materials designated for mil-5606, the correct hydraulic fluid to service the system ? | mil-5606 |
| The internal resistance of a fluid which tends to prevent it from flowing is called? | viscosity |
| Which is a characteristic of petroleum base hydraulic fluid? | low flashpoint, low fire point, temperature stability |
| petroleum base hydraulic fluid is what color? | RED |
| Which hydraulic fluid is adversely affected by atmospheric humidity if left unprotected? | Skydrol |
| What color is synthetic based hydraulic fluid? | PURPLE |
| What is one advantage of fluid power? | non compressible, constant pressure |
| Two types of hydraulic fluids currently being used in civil aircraft are? | mil-5606?skydrol |
| What are the desirable properties of a good hydraulic fluid that has chemical stability? | high flash point |
| Where can information be obtained about the compatibility of fire-resistant hydraulic fluid with aircraft materials? | SDS/ MANUAL |
| Characteristic of mil-5606/petroleum base? | RED |
| the hydraulic component that automatically directs fluid from either the normal source or an emergency source to an actuating cylinder is called a? | Shuttle valve |
| The primary purpose of a hydraulic actuating unit is to transform? | Fluid power into movement in linear motion |
| The primary function of the flap overload valve is to? | Not let the flaps go down |
| A unit which transforms hydraulic pressure into linear motion is called? | Actuator |
| Unloading valves are used with many engine-driven hydraulic pumps to? | relief valve |
| What safety device is usually located between the driving unit and hydraulic pump drive shaft? | Shear section |
| Excluding lines, which components are required to make up a simple hydraulic system? | Reservoir, pump, valve, actuator. |
| In a gear type hydraulic pump, a mechanical safety device incorporated to protect the pump from overload is the? | Shear shaft |
| Pressure is a term used to indicate the force per unit area. Pressure is usually expressed in? | PSI/ Pounds Per SQ inch |
| If two actuating cylinders which have the same cross-sectional area but different lengths of stroke are connected to the same source of hydraulic pressure, they will exert? | The same |
| Heat exchanger cooling units are required in some aircraft hydraulic stems because of? | cool fluid |
| The unit which causes one hydraulic operation to follow another in a definite order is called a? | sequence valve |
| some hydraulic systems incorporate a device which is designed to remain open to allow a normal fluid flow in the line, but closed if the fluid flow increases above a established rate. This device is generally referred to as a? | hydraulic fuse |
| Chattering of the hydraulic pump during operation is an indication of? | Air |
| A hydraulic motor converts fluid pressure to? | Rotational |
| Hydraulic fluid filtering elements constructed of porous paper are normally discarded or cleaned and reused? | False non reusable |
| The metering pins in oleo shock struts serve to? | restrict flow through orfice |
| After performing maintenance on an aircrafts landing gear system which may have affected the systems operation, it is necessary to? | Swing gear |
| on all aircraft equipped with retractable landing gear, some means must be provided to? | Manually extend gear |
| what is the purpose of the torque links attached to the cylinder and piston of a landing gear oleo strut? | Keep the wheel aligned |
| when air/oil type of landing gear shock strut is used, the initial shock of landing is cushioned by? | Metering pin |
| Instructions concerning the type of fluid and amount of air pressure to be put in a shock strut are found? | Service manual chapter 2 |
| When an empty shock strut is filled with fluid, care should be taken to extend and compress the strut completely at least two times to? | To get air bubbles out |
| A landing gear position and warning system will provide a warning in the cockpit when the throttle is? | Reduced throttle and gear is up |
| A flap position and warning system will provide a warning in the cockpit when the flap lever is placed in the down position and throttle is? | Flaps down at full throttle |
| Seals used with a mineral based hydraulic fluid are identified by which color code? | blue |
| What would be the effect of the piston return spring broke in a master cylinder? | dragging brakes |
| in brake service work, the term "bleeding brakes" is the process of | removing fluid to get air out of line |
| to prevent very rapid extention of an oleo strut after initial compression resulting from landing impact, | metering pin |
| a pilot reports the right brake on an aircraft is spongy when the brake pedal is depressed in a normal manner, the probable cause is | air in the line |
| aside from an external leak in the line, what will cause parking brakes to continuously bleed off pressure? | bad seals in master cylinder |
| why do you inflate and deflate tires when putting a new one on | align tube in tire |
| the metering pins in oleo struts serve to | slow fluid rate |
| after performing maitenance on struts | perform an opperating check |
| a stripe or mark on a wheel and tire is | slippage marks |
| when bleeding aircraft brakes, air is purged when | the pedal is firm |
| overinflated tires can cause damage to the | wheel flange |
| internal leakage in a brake cylinder unit can cause the | emergency brake to leak off |
| aircraft tire pressure should be checked | before flight |
| during taxi, if the struts bottom out, the most probable cause is | low fluid |
| correct aircraft tire inflation is found in | AMM |
| what should be checked when a strut bottoms out during landing | fluid level |
| best safeguard agianst tire heat buildup are | proper inflation |
| fusable plugs installed in some aircraft wheels will | melt if overheated |
| if tire psi difference is 5 lbs | inflate to proper psi |
| how long should you wait after flight befor checking tire pressure | 2-3 hours |
| extention of oleo strut is measured to determine the | correct fluid level and air pressure |
| if a strut bottoms after it has been properly serviced, the | seals need replaces |
| aircraft tire inflation can be found | in AMM |
Created by:
ktallarito