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Eng. elec. sys.
FAA AMP
| Question | Answer |
|---|---|
| the most effective method of regulating aircraft direct current generator output is to vary, according to the load requiremnets, the | strenght of the stationary field |
| 1) electrical wires larger than 10 guage use uninsulated terminals. 2) electrical wires smaller than 10 guage use unisnluated terminals. regarding the above: | only 1 is true |
| a certain direct current series motor mounted within an aircraft draws more amperes during start than when it is running under its rated load. the most logical conclusion that may draw is | the condition is normal for this type of motor |
| which of the Feder Aviation Regulation requirement prevents the use of automatic reset circuit breakers? | 14 CFR 23 |
| 1) alternators are rated in volt-amps, which is a measure of the apparent power being produced by the gen. 2) alternating current has the advantage over direct current in that its voltage and current can easily be stepped up or down. regarding the above | both are true |
| if a generator is malfunctioning, its voltage can be reduced to residual by actuating the | generator master switch |
| aircraft electrical wire is manufactured in sizes according to a standard known as | American Wire Guage (AMG) |
| when the starter switch to the aircraft gas turbine engine starter-generator is energized and the engine fauls to rotate, one of the probable causes would be the | starter solenoid is defective |
| electric motors are often classified according to the method of connecting the field coils and armature. aircraft engine starter motors are generally which type? | series |
| what is the ampere-hour rating of a storage battery that is designed to deliver 45 amperes for 2.5 hours? | 112.5 Ampere-hour |
| the generating system of an aircraft charges the battery by using | constant voltage and variyng current |
| refer to figure 4. in a 28-volt system, what is the maximum continuous current that can be carried by a single No. 10 copper wire 25ft long, routed in free space | 35 amperes |
| why is it unnecessary to flash the field of the exciter on a brushless alternator? | permanent magnets are installed in the main fiel poles |
| alternators (AC gens) that are driven by constant-speed drive (CSD) mechanism are used to regulate the alternator to a constant | Hertz output |
| what precautions is usually taken to prevent electrolyte from freezing in a lead-acid battery? | keep the battery fully charged |
| how many basic types of circuit breaker are used in powerplant installation electrical systems? | three |
| what are two types of AC motors that are used to produce a relatively high torque? | three-phase induction and capacitor start |
| according to the electron theory of the flow of electricity, when a properly functionung DC akternator and coltage regulating system is charging an aircraft's battery, the direction of the current flow thru the battery | is into the negative ternimal and out the positive terminal |
| the stationary field strenght in a direct current generator is varied | according to the load requirements |
| what type of electric motor is generally used with a direct-cranking engine starter? | direct current series-wound motor |
| what type of lubricant may be used to aid in pulling electrical wires or cables through conduits? | soapstone talc |
| what is the maximum number of bonding jumper wires that may be attached to one terminal grounded to a flat surface? | four |
| what is the purpose of reverse-current cutout relay? | it opens the main generator circuit whenever the generator voltage drops below the battery voltage |
| a typical barrier type aircraft terminal is made of | paper-base phenolic compound |
| which of the following Federal Avitaion Regulations requires that all aircraft using fuses as the circuit protective devices carry 'one spare set of fuses, or three spare fuses of each kind required'? | 14 CFR part 91 |
| when installing an electrical switch, under which of the following conditions should the switch be derated from its nominal current rating? | direct current motor circuits |
| bonding jumpers should be designed and installed in such a manner that they | provide a low electrical resistance in the ground circuit |
| upon what does the output frequency of an AC generator (alternator) depend? | the speed of rotation and the number of field poles |
| when installing electrical wiring parallel to a fuel line, the wiring should be | above the fuel line |
| the maximum number of terminals that may be connected to any one terminal stud in an aircraft electrical system is | Four |
| ON-OFF two position engine electrical switches should be installed | so the ON position is reached by a forward or upward motion |
| how many hours will a 140 ampere-hour battery deliver 15 amperes? | 9.33 hours |
| the maximum allowable voltage drop between the generator and the bus bar is | 2% of regulated voltage |
| aircraft that operates more than one generator connected to a common electrical system must be provided with | individual generator switches that can be operated from the cockpit during flight |
| generator voltage will not build up when the field is flashed and solder is found on the brush cover plate. these are most likley indications of | an open armature |
| one way that automatic ignition relight systems are activated on gas turbine engines is by a | drop in compressor discharge pressure |
| electrical switches are rated according to the | coltage and current they can control |
| 1) most modern aircraft use circuit breakers rather than fuses to protect their electrical circuits. 2) part 23 requires that all electrical circuits incorporate some form of circuit protective device regarding the above | only 1 is true |
| starter brushes should be replaced when they are worn down to | one-half the original lenght |
| arcing at the brushes and burning of the commutator of a motor may be caused by | weak brush springs. |
| the time/current capacities of a circuit breaker or fuse must be | below those of the associated conductor |
| when does current flow through the coil of a solenoid-operated electrical switch? | continually, as long as the control circuit is complete |
| a term commonly used when two or more electrical terminals are installed on a single lug of a terminal strip is | stacking |
| which of the following is regulated in a generator to control its voltage output | the strenght of the field |
| what is a basic advantage of using AC for electrical power for a large aircraft? | AC systems operate at higher voltage than DC sys. and therefore use less current and can use smalled and lighter weight wiring |
| a high surge of current is required when DC electric motor is first started. as the speed of the motor increases, | the counter EMF builds up and opposes the applied EMF, thus reducing the current flow through the armature |
| if the points in a vibrator-type voltage regulator stick in the closed position while the generator is operating, what will be the probable result? | generator output voltage will increase |
| 1) electrical circuit protection devices are rated based on the amount of current that can be carried w/out overheating 2) a trip-free circuit breaker makes it imposisble to manually hold the circuit close when ecessive current is flowing. which is true | both are true |
| as the generator load is increased (within its rated capacity), the voltage will | remain constant and the ampere output will increase |
| the constant current method of charging a nickle-cad battery | is the method most effective in maintaing cell balance |
| the parts of a DC alternator power system that prevents reverse flow of current from the battery to the alterrnator is the | rectifier |
| what is used to polish commutators or slip rings? | double-0 sandpaper |
| what is the frequency of most aircraft alternating current? | 400Hz |
| refer to figure 4. the following data concerning the installation of an electrical unit is known: current requirements for continuous opp-- 11 amps; cable lenght: 45 ft; sys volts: 28V (max 1V drop) cable in conduit and bundles. what is the minimum size | No. 12 |
| which Federal Aviation Regulation specifies that each resettable circuit portecive device requires a manual operation to restore service after the devuce has interrupted the circuit? | 14 CFR part 23 |
| aorcraft wire size is determined by using a(n) | wire gauge |
| what is the smallest terminal stud allowed for aircraft electrical power systems? | No. 10 |
| why is a constant-speed drive used to control the speed of some aircraft engine-driven generators? | so that the frequency of the alternating current output will remain constant |
| what speed must an eight-pole AC generator turn to produce 400Hz AC? | 6,000 RPM |
| when selecting an electrical switch for installation in an aircraft circuit utilizing a direct current motor, | a derating factor should be applied |
| the reason for flashing the field in a generator is to | restore residual magnetism to the field frame |
| what device is used to convert alternating current, which has been unduced into the loops of the rotating armature of a DC generator, to DC? | a commutator |
| electrical protection devices are installed primarly to protect the | wiring |
| which of the following aircraft circuits does NOT contain a fuse/circuit breaker? | starter circuit |
| how are the rotor windings of an aircraft alternator usually excited? | by a variable direct current. |
| when a 28V, 75 amp gen. is installed on an aircraft, an electrical load analysis ground check is performed and it is determined that the battery is furnishing 57 amps to the system, with all electrical equipment operating. this indicates | the load will be within the generator load limi |
| as the flux density in the field of a DC generator increases and the current flow to the system increase, the | force required to turn the generator increases. |
| in order to reduce the possibility of ground shorting of the circuits when the connectors are seperated for maintenance, the AN and MS electrical connectors should be installed with the | pin section to the ground side of the electrical circuit. |
| the resistance of the current return path through the aircraft is always considered to be negligible, provided the | structure is adequately bonded |
| aircraft copper wire is coated with tin, silver, or nickle in order to | prevent oxidixation |
Created by:
cordon.gabriel
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