AIRFRAME AME TEST 2

One purpose of a growler test is to deter­mine the presence of. an out of round commutator. a broken field lead. a shorted armature.

If a generator is equipped with a vibrator type voltage regulator, the actual time the voltage regulator points remain open. is controlled by the reverse current cutout relay point clearance. depends on the load carried by the generator. is increased when the externa! load is greater than the generator output.

What is a cause of generator brush arcing?. A- Low spring tension. B- Carbon dust particles. Seating brushes with No. 000 sandpaper.

The method most often used in over­ coming the effect of armature reaction is through the use of. drum wound armatures in combination with a negatively connected series field. interpoles. shaded poles.

The only practica! method of maintaining a constant voltage output from an aircraft generator under varying conditions of speed and load is to vary the. strength of the magnetic field. number of conductors in the armature. speed at which the armature rotates.

The pole pieces or shoes used in a DC gen­erator are a part of the. armature assembly. field assembly. brush assembly.

How many cycles of AC voltage are pro­ duced in a six pole alternator of the re­ volving field type for each revolution of the rotor?. 6. 4. 3.

If the reverse current cutout relay contact points fail to open after the generator out­ put has dropped below battery potential, current will flow through the generator armature. A- opposite the normal direction and through the shunt field in the normal direction. B- inthe normal direction and through the shunt field opposite the normal direction. C- and the shunt field opposite the normal direction.

In a generator, what eliminates any possi­ble sparking to the brush guides caused by the movement of the brushes within the holder?. Brush spring tension. The brush pigtail. Undercutting the mica on the commutator.

The commutator of a generator. changes direct current produced in the armature into alternating current as it is taken from the armature. changes alternating current produced inthe armature into direct current as it is taken from the armature. reverses the current in the field coils at the proper time in arder to produce direct current.

Which of the following is not one of the purposes of interpoles in a generator?. Which of the following is not one of the purposes of interpoles in a generator?. Reduce field strength. Overcome armature reaction.

To test generator or motor armature wind­ings for opens. check adjacent segments on commutator with an ohmmeter on the high resistance scale. use a 12/24V test light between the armature core segments and the shaft. place armature in a growler and connect a 110V test light on adjacent segments; light should light.

To what depth is the mica insulation be­tween the commutator bars of a DC genera­tor undercut?. Equal to twice the width of the mica. Equal to the width of the mica. One half the width of the mica.

A voltage regulator controls generator output by. introducing a resistance in generator­ to-battery lead in the event of overload. shorting out field coil in the event of overload. varying current flow to generator field coil.

Which type of DC generator is not used as an airplane generator?. Compound wound. Externally grounded. Series wound.

What is the most accurate type of frequen­cy measuring instrument?. Electrodynamometers using electromagnetic fields. Integrated circuit chip having a dock circuit. Electromagnets using one permanent magnet.

What does a rectifier do?. A- Changes direct current into alternating current. B- Reduces voltage. C- Changes alternating current into direct current.

When a diode is checked for an open cir­ cuit ora short circuit, it should be. checked with a milliamp ammeter. in the circuit. disconnected from the circuit.

Which of the following is most likely to cause thermal runaway in a nickel-cadmi­ um battery?. Constant current charging of the battery to more than 100 percent of its capacity. A high interna! resistance condition. Excessive current draw from the battery.

The voltage output of an alternator may be regulated by controlling the. voltage output of the DC exciter. speed of the alternator. - resistance in the rotor windings.

If the (+) terminal of a voltmeter is con­nected to the (-) terminal of the source voltage and the (-) terminal of the meter is connected to the (+) terminal of the source voltage, the voltmeter will read. correctly. low voltage. backwards.

To help minimize radio interference a ca­pacitar willlargely eliminate and provide a steady direct current if the capacitar is connected to the generator in. parallel. series. series/parallel.

One advantage of using AC electrical pow­ er in aircraft is. that AC electrical motors can be reversed while DC motors cannot. that the effective voltage is 1.41 times the maximum instantaneous voltage; therefore, less power input is required. greater ease in stepping the voltage up or down.

If the positive field lead between a gener­ ator and a generator control panel breaks and is shorted while the engine is running, a voltmeter connected to generator output would indicate. normal voltage. residual voltage. zero voltage.

What is a method used for restoring gener­ator field residual magnetism?. - Energize the armature. - Flash the fields. Reseat the brushes.

The major advantages of alternating cur­rent (AC) over direct current (DC) is the fact that its current and voltage can easily be increased or decreased. by means of a inverter. by means of a transformer. by means of a rectifier.

When using an ohnuneter to check the continuity of a generator field coil, the coil should. show very low resistance if it is a series field coil. be removed from the generator housing. show high resistance when the meter prods are connected to the terminals of the coil.

The strength of the core of an electromag­ net depends upon the material from which it is constructed and which of the follow­ing?. The size (cross section) and the number of turns of wire in the coil and the applied voltage. The number of turns of wire in the coil and the applied voltage. The number of turns of wire in the coil and the amount of current (amperes) passing through the coil.

A voltage regulator controls generator volt­age by changing the. current in the generator output circuit. resistance of the generator field circuit. resistance in the generator output circuit.

The most common method of regulating the voltage output of a compound DC gen­erator is to vary the. current flowing through the shunt field coils. resistance of the series field circuit. total effective field strength by changing the reluctance of the magnetic circuit.

If any one generator in a 24-volt DC system shows low voltage, the most likely cause is. A- a defective reverse current cutout relay. B- shorted or grounded wiring. C- an out of adjustment voltage regulator.

Aircraft which operate only AC generators (alternators) as a primary source of electri­ cal power normally provide current suit­ able for battery charging through the use of. a stepdown transformar and a rectifier. a dynamotor with a half wave DC output. an inverter and a voltage dropping resistor.

Major adjustments on equipment such as regulators, contactors, and inverters are best accomplished outside the airplane on test benches with necessary instruments and equipment. Adjustment procedure should be as outlined by. the equipment manufacturer. aircraft technical orders. the FAA.

In an AC circuit with no phase lead or lag, which is true?. Real power is greater than apparent power. Real power is zero. Real power equals apparent power.

How are generators rated?. Amperes at rated voltage. Watts at rated voltage. The impedance at rated voltage.

How is a shunt wound DC generator con­nnected?. One field is shunted across the other. The field and armature are shunted with a capacitar. Both fields are shunted across the armature.

The poles of a generator are laminated to. increase flux concentration. reduce flux losses. reduce eddy current losses.

What is the frequency of an alternator de­pend upon?. RPM. Voltage. Current.

The generator rating is usually found stamped on the. engine. firewall. generator.

Residual voltage is a result of magnetism in the. field shoes. armature. field windings.

CSD driven generators are usually cooled by. both ram air and an integral fan. an integral fan. oil spray.

A CSD unit drives a generator through the use of. a variable hydraulic pump and hydraulic motor. a synchronous electric motor. an infinitely variable mechanical gearing system.

Integrated drive generators (IDG) employ a type of high output AC generator that utilizes. a brushless system to produce current. brushes and slip rings to carry generated DC exciter current to the rotating field. battery current to excite the field.

If the IDG scavenge oil filter is contaminat­ed with chunks or pieces of metal. replace the oil and filter at 25 hour intervals. change the oil at 25 hour intervals. remove and replace the IDG.

When necessary during operation, CSD disconnect is usually accomplished by. a shear section in the input shaft. a switch in the cockpit. circuit breaker activation.

A CSD unit that is disconnect ed in flight, due to a malfunction such as overtempera­ture, may be reconnected. manually by the flightcrew. automatically if the temperatura falls back into the normal operating range. only on the ground by maintenance personnel.

When AC generators are operated in paral­ lel, theWhen AC generators are operated in paral­lel, the. amperes and voltage must both be equal. amperes and frequency must both be equal. frequency and voltage must both be equal.

An ammeter ina battery charging system is for the purpose of indicating the. rate of current used to charge the battery. amperage available for use. total amperes being used in the airplane.

During ground operation, aircraft generator cooling is usually accomplished by. auxiliary air cooled through an air/fuel heat exchanger. an integral fan. an externa! motor-driven fan.

What type of instrument is used for mea­ suring very high values of resistance?. Shunt type ohmmeter. Multimeter. Megohmmeter.

Grounding is electrically connecting a conductive object to the primary structure. One purpose of grounding is to. prevent development of radio frequency potentials. prevent current return paths. allow static charge accumulation.

When using the voltage drop method of checking circuit resistance, the. input voltage must be maintained at a constant value. output voltage must be maintained at a constant value. - input voltage must be varied.

The primary consideratio ns when select­ ing electric cable size are. the voltage and amperage of the load it must carry. the system voltage and cable length. current carrying capacity and allowable voltage drop.

In installations where the ammeter is in the generator or alternator lead, and the regulator system does not limit the maxi­mum current that the generator or alterna­ter can deliver, the ammeter can be red­ lined at what percent of the generator or alternator rating?. 75. 100. 50.

How should a voltmeter be connected?. In series with the load. In parallel with the load. In series with the source.

Certain transport aircraft use AC electrical power for all normal operation and battery furnished DC electrical power for standby emergency use. In aircraft of this type that operate no DC generators, the batteries are kept charged by. rectifiers which use the aircraft's AC generators as a source of power. alternators which use the aircraft's generators as a source of power. inverters which use the aircraft's AC generators as a source of power.

when installing an anticollision light?. Install a switch independent of the position light switch. Connect the anticollision light to the aircraft position light switch. Use shielded electrical cable to assure fail safe operation.

The inductor type inverter output voltage is controlled by the. DC stator field current. voltage regulator. number of poles and the speed of the motor.

The overvoltage control automatically pro­ tects the generator system when excessive voltage is present by. opening and resetting the field control relay. breaking a circuit to the trip coil of the field control relay. opening the shunt field circuit.

When DC generators are operated in par­ allel to supply power for a single load, their controls include an equalizer circuit to assure that all generators share the load equally. The equalizer circuit operates by. decreasing the output of the high generator to equal the output of the low generator. increasing the output of the low generator and decreasing the output of the high generator until they are equal. increasing the output of the low generator to equal the output of the high generator.

A battery generator system provides direct current. On installations requiring alter­nating current frorn the battery generator system, it is necessary to have. a variable resistor between the battery and generator. a transformer. an inverter.

The purpose of a rectifier in an electrical system is to change. direct current to alternating current. alternating current to direct current. the frequency of alternating current.

In troubleshooting an electrical circuit, if an ohmmeter is properly connected across a circuit component and sorne value of resistance is read,. either the component or the circuit is shorted. the component has continuity and is not open. the component has continuity and is open.

Electric wire terminals for most aircraft applications must be what type?. Ring. Hook. Slotted.

The type of electric wire terminals used for most aircraft applications, in addition to providing good current carrying capabil­ ities, are designed primarily. to prevent circuit failure due to terminal disconnection. for permanent connection to the circuit. for uncomplicated and rapid circuit connection and disconnection.

Aluminum wire must be stripped very carefully because. high resistance will develop in stripping nicks. stripping nicks can cause short circuits. individual strands will break easily after being nicked.

For general electrical use in aircraft, the acceptable method of attaching a terminal to a wire is by. crimping. soldering. crimping and soldering.

How should the splices be arranged if sev­ era! are to be located in an electrical wire bundle?. Enclosed in a conduit. Grouped together to facilitate inspection. Staggered along the length of the bundle.

What is the mínimum bend radius for an electrical wire bundle?. Ten times the outside diameter of the bundle. Fifteen times the outside diameter of the bundle. Five times the outside diameter of the bundle.

When approved, splices may be used to repair manufactured harnesses or installed wiring. The maximum number of splices permitted between any two connectors is. 3. 2. 1.

AN/MS electrical connectors are specifi­cally designed to meet. A- International Civil Aviation Organization (ICAO) standards. B- Technical Standard Order (TSO) specifications. C- military specifications.

The most common method of attaching a pin or socket toan individual wire in an MS electrical connector is by. crimping and soldering. crimping. soldering.

The pin section of an AN/MS connector is normally installed on. either side of a circuit (makes no difference). the ground side of a circuit. the power supply side of a circuit.

What is normally used to bond non contin­ius stainless steel aircraft components?. Aluminum jumpers. Stainless steel jumpers. Copper jumpers.

Oil canning of the sides of aluminum or steel electrical junction boxes is consid­erad to be. normal operation in vibration prone areas. acceptable operation. a shorting hazard.

During inspection of the terminal strips of an aircraft electrical system, it should be determinad that. only plain nuts and lockwashers have been used for terminal attachment to the studs. only locknuts have been used for terminal attachment to the studs. the terminal studs are anchored against rotation.

Aircraft electrical junction boxes locatedin a fire zone are usually constructed of. stainless steel. cadmium plated steel. asbestos.

How does the routing of coaxial cables dif­fer from the routing of electrical wiring?. Coaxial cables are routed parallel with stringers or ribs. Coaxial cables are routed as directly as possible. Coaxial cables are routed at right angles to stringers or ribs.

Bonding connections should be tested for. Reactance. amperage value. resistance value.

What is the color and orientation of the position lights for navigation on civil air planes?. Left side - white, right side - green, rear, aft- red. Left side - red, right side - green, rear aft- white. Left side - green, right side - red, rear aft- white.

Aircraft fuse capacity is rated in. volts. amperes. ohms.

Electric circuits are protected from over­ heating by means of. thermocouples. shunts. fuses.

A circuit breaker is installed in an aircraft electrical system primarily to protect the. circuit and should be located as clase to the source as possible. electrical unit in the circuit and shauld be lacated as clase to the source as passible. circuit and should be lacated as clase to the unit as possible.

A hydraulic hose identified as MIL-H-8794 will have a yellow stripe running the length of the hose. This stripe. ideritifies that the hose is constructed of synthetic rubber and may be suitable for a wide range of applications. identifies that the hose is for hydraulic fluid only. is used to ensure that the hose is installed without excessive twisting.

The removal of air from an aircraft hydrau­lic system is generally accomplished. through automatic bleed valves on individual components during system operation. by allowing the system to remain inoperative for several hours. by operating the various hydraulic components through several cycles.

Which characteristics apply to aircraft hydraulic systems? 1. Minimum maintenance requirements 2. Lightweight 3. About 80 percent operating efficiency (20 percent loss due to fluid friction) 4. Simple to inspect. 1,2,3 and 4. 1,2 and 4. 1,3 and 4.

Which statement about fluids is correct?. All fluids are considerad to be highly compressible. Any fluid will completely fill its container. All fluids readily transmit pressure.

Pressure is a term used to indicate the force per unit area. Pressure is usually expressed in. pounds per inch. pounds per square inch. pounds per cubic 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 exect. different amounts of force but will move at the same rate of speed. equal amounts of force and will move at the same rate of speed. equal amounts of force but will move at different rates of speed.

Using a hand pmnp, pressure of 100 PSI has been built up in a hydraulic system. The hand pump pistan is 1inch in diam­ eter. A 1/2-inch line connects the hand pmnp toan actuating cylinder 2 inches in diameter. What is the pressure in the line between the hand pump and the actuator?. 150 PSI. 100 PSI. 200 PSI.

A crossflow valve which is designed to bypass fluid from one side of an actuating cylinder to the other side, under certain conditions, may be found in sorne aircraft installed in the. flap overload system. landing gear system. engine cowl flap system.

To prevent external and internalleakage in aircraft hydraulic units, the most common­ly used type of seal is the. 0-ring seal. gasket seal. chevron seal.

What type of packings should be used in hydraulic components to be installed in a system containing Skydrol?. AN packings made of neoprene. Packing materials made for ester base fluids. AN packings made of natural rubber.

What is the purpose of using backup rings with 0-rings in hydraulic systems above 1,500 PSI?. Prevent high pressure from extruding the seal between the moving and stationary part. Provide a seal between two parts of a unit which move in relation to each other. Prevent internal and externalleakage of all moving parts within a hydraulic system.

The installation of a new metal hydraulic line should be made with. a straight tube to withstand the shocks and vibration to which it will be subjected. enough bends to allow the tube to expand and contract with temperature changes and to absorb vibration. a straight tube to permit proper alignment of the fitting and thereby reduce fluid loss through leakage.

Extrusion of an 0-ring seal is prevented in a high pressure system by the use of a. backup ring on the side of the 0-ring next to the pressure. U ring on the side of the 0-ring away from the pressure. backup ring on the side of the 0-ring away from the pressure.

A flexible sealing element subject to mo­tion is a. GASKET. COMPOUND. PACKING.

If a rigid tube is too short for the flare to reach its seat before tightening, pulling it into place by tightening. may distort the fiare. is acceptable. may distort the cone.

If a hydraulic brake system uses neoprene rubber packing materials, the correct hy­ draulic fluid to service the system is. mineral base oil. phosphate ester base oil. vegetable base oil.

The interna! resistance of a fluid which tends to prevent it from flowing is called. volatility. viscosity. acidity.

· What is the viscosity of hydraulic fluid?. The interna! resistance of a fluid which tends to prevent it from flowing. The increase in volume of a fluid due to temperatura change. The fluid's ability to resist oxidation and deterioration for long periods.

Which is a characteristic of petroleum base hydraulic fluid?. Nonflammable under all conditions. Flammable under normal conditions. Compatible to natural rubber seals and packings.

Petroleum base hydraulic fluid is which color?. purple. red. blue.

Which of the following is adversely affect­ ed by atmospheric humidity if left unpro­ tected? 1. MIL-H-5606 hydraulic fluid. 2. Skydrol hydraulic fluid. 3. None ofthe above. 2. 1 and 2. 3.

Which is a characteristic of synthetic base hydraulic fluid?. Low flash point. Low moisture retention. High flash point.

Two types of hydraulic fluids currently being used in civil aircraft are. A- mineral base, and phosphate ester base. B- mixed mineral base and phosphate ester base. C- petroleum base and mixed mineral base.

Which of the following lists only desirable properties of a good hydraulic fluid?. High viscosity, low flash point, chemical stability, high fire point. Low viscosity, chemical stability, high flash point, high fire point. High flash point, low viscosity,chemical stability, low fire point.

Characteristics of MIL-H-8446 (Skydrol 500 A & B) hydraulic fluid are. blue color, phosphate ester base, fire resistant, butyl rubber seals. light purple color, phosphate ester base, tire resistant, butyl rubber seals. light green color, phosphate ester base, fue resistant, butyl rubber seals.

Where can information be obtained about the compatibility of fire resistant hydraulic fluid with aircraft materials?. Fluid manufacturer's technical bulletins. Aircraft manufacturer's specifications. AC 43.13-lA.

Characteristics of MIL-H-5606 hydraulic fluid are. A- light purple color, phosphate ester base, fue resistant, uses butyl rubber seals. B- blue color, will burn, uses natural rubber seals. C- red color, petroleum base, will burn, uses synthetic rubber seals.

If an aircraft hydraulic system requires mineral base hydraulic fluid, but phos­ phate ester base hydraulic fluid is used, what will be the effect on the system?. System will be contaminated, fluids will not blend, and the seals will fail. No effect. System will be contaminated, fluids will not blend, but there will be no seal problem.

What is used to flush a system normally serviced with MIL-H-5606 hydraulic fluid?. Naphtha or varsol. Lacquer thinner or trichloroethylene. Methyl ethyl ketene or kerosene.

Components containing phosphate es­ ter-base hydraulic fluid may be cleaned with. Naphtha. Carbon tetrachloride. Stoddard solvent.

How can the proper hydraulic fluid to be used in an airplane be determinad?. Consult the aircraft manufacturer's service manual. Refer to the aircraft parts manual. Consult the aircraft Type Certificate Data Sheet.

Phosphate ester base hydraulic fluid is very susceptible to contamination from. ethylene propylene elastomers. teflon seal material. water in the atmosphere.

1. Materials which are Skydrol compati­ ble or resistant include most common aircraft metals and polyurethane and epoxy paints. 2. Skydrol hydraulic fluid is compatible with nylon and natural fibers. Regarding the above staternents,. both No. 1and No. 2 are true. only No. 1is true. neither No. 1nor No. 2 is true.

Which seals are used with petroleurn base hydraulic fluids?. Buna-N. Butyl rubber. Polyester.

Which seal/material is used with phos­ phate ester base hydraulic fluids?. Silicone rubber. Neoprene rubber. Butyl rubber.

One of the main advantages of skydrol is it's. wide operating temperature. inability to mix with water. high operating pressure.

Hydraulic system thermal relief valves are set to open at a. lower pressure than the system pressure regulator. lower pressure than the system relief valve. higher pressure than the system relief valve.

Although dents in the heel of a bend are not permissible, they are acceptable in the remainder of a hydraulic tube providing they are less than what percent of the tube diameter?. 10. 20. 5.

A common cause of slow actuation of hy­draulic components is. restricted orífices. internal leakage in the actuating unit. cold fluid.

Teflon hose that has developed a perma­nent set from being exposed to high pres­sure or temperatura should. not be straightened or bent further. not be reinstalled once removed. be immediately replaced.

If an aircraft's constant pressure hydraulic system cycles more frequently than usual and no fluid leakage can be detected, the most probable cause is. low accumulator air preload. pump volume output too high. a too high relief valve setting.

Excluding lines, which components are required to make up a simple hydraulic system?. Pump, reservoir, relief valve, and shuttle valve. Actuator, pressure reservoir, accumulator, and selector valve. Pump, reservoir, selector valve, and actuator.

Quick disconnect couplings in hydraulic systems provide a means of. easily replacing hydraulic lines in areas where leaks are common. quickly connecting and disconnecting hydraulic lines and eliminate the possibility of contaminates entering the system. quickly connecting and disconnecting hydraulic lines without loss of fluid or entrance of air into the system.

How many of these seals are used with petroleum base hydraulic fluids? 1. Synthetic rubber. 2. Natural rubber. 3. Neoprene rubber. Two. One. Three.