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Quiz von DIEGO FERNANDO HERNANDEZ CORTAZAR, aktualisiert more than 1 year ago
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Erstellt von DIEGO FERNANDO HERNANDEZ CORTAZAR
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Frage 1
Frage
A series-wound dc electric motor will normally require
Antworten
-
"more current at high RPM than at low RPM."
-
approximately the same current throughout its operating range of speed.
-
"more current at low RPM than at high RPM."
-
high resistance will develop in stripping nicks.
Frage 2
Frage
A voltage regulator controls generator output by
Antworten
-
"introducing a resistance in generator-to-battery lead in the event of overload."
-
shorting out field coil in the event of overload.
-
Series wound.
-
varying current flow to generator field coil.
Frage 3
Frage
Aluminum wire must be stripped very carefully because
Antworten
-
high resistance will develop in stripping nicks.
-
stripping nicks can cause short circuits.
-
individual strands will break easily after being nicked.
-
to prevent circuit failure due to terminal disconnection.
Frage 4
Frage
An ammeter in a battery charging system is for the purpose of indicating the
Antworten
-
amperage available for use.
-
total amperes being used in the airplane.
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rate of current used to charge the battery.
-
stripping nicks can cause short circuits.
Frage 5
Frage
For general electrical use in aircraft, the acceptable method of attaching a terminal to a wire is by
Antworten
-
crimping.
-
soldering.
-
crimping and soldering.
-
Rolling
Frage 6
Frage
How can it be determined if a transformer winding has some of its turns shorted together?
Antworten
-
Measure the input voltage with an ohmmeter.
-
The output voltage will be high.
-
The transformer will get hot in normal operation.
-
A high internal resistance condition.
Frage 7
Frage
How does the magnetic brake used to stop rotation of an electric motor armature operate?
Antworten
-
"Centrifugal force releases a rotating brake cog from a stationary notch when the armature reaches a certain speed and magnetic force re-engages the cog when the electrical power is turned off."
-
A friction brake is applied by a magnet and released by a spring.
-
approximately the same current throughout its operating range of speed.
-
A friction brake is applied by a spring and released by a magnet.
Frage 8
Frage
"How many cycles of ac voltage are produced in a six-pole alternator of the revolving-field type
for each revolution of the rotor?"
Antworten
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Four.
-
Three.
-
Six.
-
Two
Frage 9
Frage
If a generator is equipped with a vibrator-type voltage regulator, the actual time the voltage regulator points remain open
Antworten
-
depends on the load carried by the generator.
-
is controlled by the reverse-current cutout relay point clearance.
-
is increased when the external load is greater than the generator output.
-
motor can be operated in either direction.
Frage 10
Frage
"If the reverse current cutout relay contact points fail to open after the generator output has dropped below battery potential, current will flow through the generator armature"
Antworten
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"in the normal direction and through the shunt field opposite the normal direction."
-
and the shunt field opposite the normal direction.
-
"Centrifugal force releases a rotating brake cog from a stationary notch when the armature reaches a certain speed and magnetic force re-engages the cog when the electrical power is turned off."
-
opposite the normal direction and through the shunt field in the normal direction.
Frage 11
Frage
One purpose of a growler test is to determine the presence of
Antworten
-
an out-of-round commutator.
-
a broken field lead.
-
a shorted armature.
-
power output of the motor can be more closely controlled.
Frage 12
Frage
The commutator of a generator
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changes direct current produced in the armature into alternating current as it is taken from the armature.
-
changes alternating current produced in the armature into direct current as it is taken from the armature.
-
"reverses the current in the field coils at the proper time in order to produce direct current."
-
total amperes being used in the airplane.
Frage 13
Frage
The method most often used in overcoming the effect of armature reaction is through the use of
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interpoles.
-
shaded poles.
-
drum-wound armatures in combination with a negatively connected series field.
-
opposite the normal direction and through the shunt field in the normal direction.
Frage 14
Frage
The only practical method of maintaining a constant voltage output from an aircraft generator under varying conditions of speed and load is to vary the
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strength of the magnetic field.
-
number of conductors in the armature.
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speed at which the armature rotates.
-
amperes and frequency must both be equal.
Frage 15
Frage
The pole pieces or shoes used in a dc generator are a part of the
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armature assembly.
-
field assembly.
-
brush assembly.
-
Inverter drive motor.
Frage 16
Frage
The starting current of a series-wound dc motor, in passing through both the field and armature windings, produces a
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low starting torque.
-
speed slightly higher when unloaded.
-
high starting torque.
-
Starter motor.
Frage 17
Frage
The type of electric wire terminals used for most aircraft applications, in addition to providing good current carrying capabilities, are designed primarily
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to prevent circuit failure due to terminal disconnection.
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for uncomplicated and rapid circuit connection and disconnection.
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for permanent connection to the circuit.
-
Reduce field strength.
Frage 18
Frage
To test generator or motor armature windings for opens,
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"place armature in a growler and connect a 110V test light on adjacent segments; light should light."
-
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.
-
rate of current used to charge the battery.
Frage 19
Frage
To what depth is the mica insulation between the commutator bars of a dc generator undercut?
Antworten
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One-half the width of the mica.
-
Equal to twice the width of the mica.
-
Equal to the width of the mica.
-
Three-half the width of the mica.
Frage 20
Frage
What is a cause of generator brush arcing?
Antworten
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"Seating brushes with No. 000 sandpaper.
-
"Carbon dust particles.
-
Low spring tension.
-
amperes and voltage must both be equal.
Frage 21
Frage
What is the color and orientation of the position lights for navigation on civil airplanes?
Antworten
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Left side - green, right side - red, rear aft - white.
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Left side - red, right side - green, rear aft - white.
-
"Left side - white, right side - green, rear aft - red."
-
Left side - White, right side - red, rear aft - white.
Frage 22
Frage
What is the minimum bend radius for an electrical wire bundle?
Antworten
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Forty times the outside diameter of the bundle.
-
Five times the outside diameter of the bundle.
-
Fifteen times the outside diameter of the bundle.
-
Ten times the outside diameter of the bundle.
Frage 23
Frage
What is the most accurate type of frequency- measuring instrument?
Antworten
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Integrated circuit chip having a clock circuit.
-
Electrodynamometers using electromagnetic fields.
-
Electromagnets using one permanent magnet.
-
checked with a milliamp ammeter.
Frage 24
Frage
What is the principal advantage of the series- wound dc motor?
Antworten
-
High starting torque.
-
Suitable for constant speed use.
-
Low starting torque.
-
speed of the motor can be more closely controlled.
Frage 25
Frage
When ac generators are operated in parallel, the
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amperes and frequency must both be equal.
-
frequency and voltage must both be equal.
-
amperes and voltage must both be equal.
-
shaded poles.
Frage 26
Frage
When approved, splices may be used to repair manufactured harnesses or installed wiring. The maximum number of splices permitted between any two connectors is
Antworten
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Four
-
two.
-
three.
-
one.
Frage 27
Frage
Which motor would be most likely to have an armature brake?
Antworten
-
Starter motor.
-
Landing light retraction motor.
-
Inverter drive motor.
-
field assembly.
Frage 28
Frage
Which of the following is most likely to cause thermal runaway in a nickel-cadmium battery?
Antworten
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A high internal resistance condition.
-
Excessive current draw from the battery.
-
"Constant current charging of the battery to more than 100 percent of its capacity."
-
has at least a residual charge before removing it from the circuit.
Frage 29
Frage
Which type of dc generator is not used as an airplane generator?
Antworten
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Externally grounded.
-
Series wound.
-
Compound wound.
-
Shunt-type ohmmeter.
Frage 30
Frage
Electric wire terminals for most aircraft applications must be what type?
Antworten
-
Slotted.
-
Hook.
-
Ring.
-
Tappered
Frage 31
Frage
How should the splices be arranged if several are to be located in an electrical wire bundle?
Antworten
-
Staggered along the length of the bundle.
-
Grouped together to facilitate inspection.
-
Enclosed in a conduit.
-
soldering.
Frage 32
Frage
In a generator, what eliminates any possible sparking to the brush guides caused by the movement of the brushes within the holder?
Antworten
-
The brush pigtail.
-
Brush spring tension.
-
Undercutting the mica on the commutator.
-
A friction brake is applied by a magnet and released by a spring.
Frage 33
Frage
Some electric motors have two sets of field windings wound in opposite directions so that the
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speed of the motor can be more closely controlled.
-
power output of the motor can be more closely controlled.
-
motor can be operated in either direction.
-
a broken field lead.
Frage 34
Frage
What type of instrument is used for measuring very high values of resistance?
Antworten
-
Megohmmeter.
-
Shunt-type ohmmeter.
-
Multimeter.
-
"introducing a resistance in generator-to-battery lead in the event of overload."
Frage 35
Frage
When a diode is checked for an open circuit or a short circuit, it should be
Antworten
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in the circuit.
-
disconnected from the circuit.
-
Electromagnets using one permanent magnet.
-
checked with a milliamp ammeter.
Frage 36
Frage
When handling a high voltage capacitor in an electrical circuit, be sure it
Antworten
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has a full charge before removing it from the circuit.
-
has at least a residual charge before removing it from the circuit.
-
is fully discharged before removing it from the circuit.
-
Excessive current draw from the battery.
Frage 37
Frage
Which of the following is not one of the purposes of interpoles in a generator?
Antworten
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Reduce field strength.
-
Overcome armature reaction.
-
Reduce arcing at the brushes.
-
stripping nicks can cause short circuits.
Frage 38
Frage
¿Que actividades realiza el relé de protección diferencial?
Antworten
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Abre el relé de generador y cierra el relé de cruce
-
Abre el relé de cruce y cierra el relé de generador
-
Compara el voltaje que sale del generador con el voltaje que llega al punto de distribución
-
Compara la corriente que sale del generador con la corriente que llega al punto de distribución
Frage 39
Frage
A battery-generator system provides direct current. On installations requiring alternating current from the battery-generator system, it is necessary to have
Antworten
-
a transformer.
-
a magnetically operated switch.
-
a variable resistor between the battery and generator.
-
an inverter.
Frage 40
Frage
A certain switch is described as a single-pole, double-throw switch (SPDT). The throw of a switch indicates the number of
Antworten
-
circuits each pole can complete through the switch.
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places at which the operating device (toggle, plunger, etc.) will come to rest and at the same time open or close a circuit.
-
terminals at which current can enter or leave the switch.
-
are useful where only temporary overloads are normally encountered.
Frage 41
Frage
A circuit breaker is installed in an aircraft electrical system primarily to protect the
Antworten
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circuit and should be located as close to the source as possible.
-
circuit and should be located as close to the unit as possible.
-
electrical unit in the circuit and should be located as close to the source as possible.
-
"To prevent short circuits in the motor field windings."
Frage 42
Frage
A circuit protection device called a current limiter is essentially a slow-blow fuse and is designed to be used in
Antworten
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400 cycle AC circuits.
-
heavy power circuits.
-
starter-generator circuits.
-
Pass through conduit.
Frage 43
Frage
A CSD unit drives a generator through the use of
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a synchronous electric motor.
-
an infinitely variable mechanical gearing system.
-
a variable hydraulic pump and hydraulic motor.
-
increase flux concentration.
Frage 44
Frage
A relay is
Antworten
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a magnetically operated switch.
-
a device which converts electrical energy to kinetic energy.
-
any conductor which receives electrical energy and passes it on with little or no resistance.
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the frequency of alternating current.
Frage 45
Frage
A voltage regulator controls generator voltage by changing the
Antworten
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resistance in the generator output circuit.
-
current in the generator output circuit.
-
resistance of the generator field circuit.
-
"decreasing the output of the high generator to equal the output of the low generator."
Frage 46
Frage
Aircraft electrical junction boxes located in a fire zone are usually constructed of
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asbestos.
-
cadmium-plated steel.
-
Iron steel copper
-
stainless steel.
Frage 47
Frage
Aircraft fuse capacity is rated in
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volts.
-
ohms.
-
amperes.
-
Watts
Frage 48
Frage
Aircraft which operate only ac generators (alternators) as a primary source of electrical power normally provide current suitable for battery charging through the use of
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a stepdown transformer and a rectifier.
-
an inverter and a voltage- dropping resistor.
-
a dynamotor with a half- wave dc output.
-
a variable resistor between the battery and generator.
Frage 49
Frage
Algunos motores eléctricos tienen dos juegos de embobinados de campo en direcciones opuestas de forma tal que
Antworten
-
La velocidad del motor pueda ser controladas de más cerca.
-
La potencia de salida del motor pueda ser controlada de mas cerca.
-
El motor pueda ser operado en cualquier dirección.
-
Las revoluciones de salida del motor pueda ser controlada de mas cerca.
Frage 50
Frage
Bonding connections should be tested for
Antworten
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resistance value.
-
amperage value.
-
reactance.
-
Alternator
Frage 51
Frage
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
Antworten
-
inverters which use the aircraft's ac generators as a source of power.
-
alternators which use the aircraft's generators as a source of power.
-
rectifiers which use the aircraft's ac generators as a source of power.
-
residual voltage.
Frage 52
Frage
Circuits that must be operated only in an emergency or whose inadvertent activation could endanger a system frequently employ
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guarded switches.
-
push-pull-type circuit breakers only (no switches).
-
spring-loaded to off toggle or rocker switches.
-
only locknuts have been used for terminal attachment to the studs.
Frage 53
Frage
CSD driven generators are usually cooled by
Antworten
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oil spray.
-
an integral fan.
-
both ram air and an integral fan.
-
battery current to excite the field.
Frage 54
Frage
Cuál es la ventaja principal de un motor de corriente continua (direct current, DC) embobinado en serie?
Antworten
-
Velocidad variable
-
Adecuado para uso a velocidad constante.
-
Baja torsión de arranque.
-
Alta torsión de arranque.
Frage 55
Frage
Cuál es una causa de que arqueen las brochas del generador?
Antworten
-
"Asentar las brochas con papel de lija número 000.
-
"Partículas de polvo de carbón.
-
Poca tensión en los resortes.
-
Polvo y condiciones ambientales
Frage 56
Frage
Cuando dos o más generadores de corriente alterna se van a conectar en paralelo, se deben cumplir las siguientes condiciones antes de su conexión:
Antworten
-
Igual corriente, igual frecuencia, igual fase e igual sincronismo
-
igual sincronismo, igual corriente, igual voltaje e igual frecuencia
-
Igual factor de potencia, igual fase, igual voltaje e igual frecuencia
-
Igual fase, igual voltaje, igual frecuencia e igual sincronismo
Frage 57
Frage
Cuando generadores de corriente alterna son operados en paralelo,
Antworten
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Los amperios y la frecuencia deben ser ambas iguales.
-
La frecuencia y el voltaje deben ser ambos iguales.
-
Los amperios y el voltaje deben ser ambos iguales.
-
Torsión baja de arranque.
Frage 58
Frage
Cuando la tensión de salida de un generador baja de un valor determinado (unos 107 voltios aproximadamente) se dice que el generador tiene bajo voltaje. El bajo voltaje puede tener su origen en:
Antworten
-
Exceso de revoluciones de la C.S.D
-
Barra defectuosa
-
Exceso de revoluciones del motor
-
Batería descargada
Frage 59
Frage
During inspection of an anticollision light installation for condition and proper operation, it should be determined that
Antworten
-
electrical or mechanical interconnections are provided so that the anticollision light will operate at all times that the position light switch is in the ON position.
-
an appropriately rated fuse is in position at the light to protect the connecting wiring against electrical faults.
-
the anticollision light can be operated independently of the position lights.
-
any conductor which receives electrical energy and passes it on with little or no resistance.
Frage 60
Frage
During inspection of the terminal strips of an aircraft electrical system, it should be determined that
Antworten
-
only locknuts have been used for terminal attachment to the studs.
-
the terminal studs are anchored against rotation.
-
only plain nuts and lockwashers have been used for terminal attachment to the studs.
-
output voltage must be maintained at a constant value.
Frage 61
Frage
El APU posee como backup para encendido:
Antworten
-
"Bateria y Bomba de Combustible de DC"
-
Bateria del Avion
-
HMG
-
IDG
Frage 62
Frage
El APU proporciona al avión:
Antworten
-
Potencia Neumática
-
Potencia Eléctrica
-
Potencia Hidráulica
-
"Potencia Neumática y Eléctrica"
Frage 63
Frage
El avión se puede alimentar eléctricamente externamente por medio de:
Antworten
-
APU
-
GPU (Ground Power Unit)
-
Arrancador Neumatico.
-
Arrancador Eléctrico.
Frage 64
Frage
El control del correcto funcionamiento de la C.S.D. lo observamos en la cabina en los siguientes indicadores:
Antworten
-
Frecuencimetro del generador asociado a la CSD, Luces indicadoras de CSD, Relé de la Barra de Alterna
-
Relé de la barra directa – Frecuencimetro del generador asociado a la CSD – Luces indicadoras de CSD
-
Termómetro de temperatura de aceite – Frecuencimetro del generador asociada con la CSD – Luces indicadoras de CSD
-
Frecuencimetro del generador asociado con la CSD – Luces indicadoras de CSD- Regulador de voltaje
Frage 65
Frage
El generador de corriente alterna del tipo sin escobillas no necesita ningún tipo de conexión eléctrica, entre la parte giratoria y no giratoria del mismo, debido a:
Antworten
-
La ley de Lenz
-
La ley de Ampere
-
La ley de Faraday
-
La ley de Coulomb
Frage 66
Frage
El generador del Avion genera con una frecuencia de:
Antworten
-
60hz
-
50hz
-
120hz
-
400hz
Frage 67
Frage
El reparto de la carga reactiva de cada generador es controlado por:
Antworten
-
El relé del generador
-
El relé de la barra de enlace
-
El regulador de voltaje
-
El APU
Frage 68
Frage
El sistema eléctrico del avión permite utilizar la batería en tierra para:
Antworten
-
Operar los sistemas utilitarios
-
Mantener la temperatura de cabina.
-
Mantener el sistema de combustible encendido siempre
-
Mantener la presión de la cabina.
Frage 69
Frage
Electric circuits are protected from overheating by means of
Antworten
-
thermocouples.
-
shunts.
-
fuses.
-
cadmium-plated steel.
Frage 70
Frage
Electric wiring installed in aircraft without special enclosing means (open wiring) offers the advantages of ease of installation, simple maintenance, and reduced weight. When bundling open wiring, the bundles should
Antworten
-
be limited as to the number of cables to minimize damage from a single electrical fault.
-
include at least one shielded cable to provide good bonding of the bundle to the airframe.
-
be limited to a minimum bend radius of five times the bundle diameter to avoid excessive stresses on the cable insulation.
-
Support the bundle to structure and/ or solid fluid lines to prevent chafing damage.
Frage 71
Frage
En el regulador de voltaje del sistema eléctrico utilizado normalmente en los generadores encontramos las siguientes partes:
Antworten
-
P.M.G, circuito de detección, circuito amplificador, circuito de detección y detector de error
-
G.C.U, circuito de detección, circuito amplificador, circuito de detección y detector de error
-
Fuente de alimentación, G.C.U, circuito amplificador, circuito de detección y detector de error
-
Fuente de alimentación, circuito amplificador, circuito de detección y detector de error
Frage 72
Frage
Entre las componentes del inversor de tipo estático tenemos:
Antworten
-
Filtro de armónicos, etapa de control, cilindro de control, retardo de encendido, excitador de potencia y red de filtro
-
Sensor de corriente, etapa de control, cilindro de control, retardo de encendido, excitador de potencia y red de filtro
-
Generador de onda cuadrada, etapa de control, conformador de pulsos, retardo de encendido, excitador de potencia y red de filtro
-
Filtro de armónicos, sensor de potencia, conformador de pulsos, retardo de encendido, etapa de control y red de filtro
Frage 73
Frage
Generalmente de las Barras de DC se conectan:
Antworten
-
Sistemas básicos del avión
-
Sistemas esenciales y de emergencia
-
Sistemas poco importantes
-
Sistemas Obsoletos
Frage 74
Frage
Grounding is electrically connecting a conductive object to the primary structure. One purpose of grounding is to
Antworten
-
prevent current return paths.
-
allow static charge accumulation.
-
prevent development of radio frequency potentials.
-
push-pull-type circuit breakers only (no switches).
Frage 75
Frage
How are generators rated?
Antworten
-
Watts at rated voltage.
-
Amperes at rated voltage.
-
The impedance at rated voltage.
-
Current.
Frage 76
Frage
How can the direction of rotation of a dc electric motor be changed?
Antworten
-
Interchange the wires which connect the motor to the external power source.
-
Reverse the electrical connections to either the field or armature windings.
-
Rotate the positive brush one commutator segment.
-
electrical or mechanical interconnections are provided so that the anticollision light will operate at all times that the position light switch is in the ON position.
Frage 77
Frage
How does the routing of coaxial cables differ from the routing of electrical wiring?
Antworten
-
Coaxial cables are routed parallel with stringers or ribs.
-
Coaxial cables are routed at right angles to stringers or ribs.
-
Coaxial cables are routed as directly as possible.
-
Coaxial wires
Frage 78
Frage
How is a shunt-wound dc generator connected?
Antworten
-
One field is shunted across the other.
-
Both fields are shunted across the armature.
-
The field and armature are shunted with a capacitor.
-
a synchronous electric motor.
Frage 79
Frage
How should a voltmeter be connected?
Antworten
-
In series with the source.
-
In parallel with the load.
-
In series with the load.
Frage 80
Frage
If a wire is installed so that it comes in contact with some moving parts, what protection should be given the wire?
Antworten
-
Wrap with soft wire solder into a shield.
-
Wrap with friction tape.
-
Pass through conduit.
-
wrapping with plastic.
Frage 81
Frage
If any one generator in a 24-volt dc system shows low voltage, the most likely cause is
Antworten
-
an out-of-adjustment voltage regulator.
-
shorted or grounded wiring.
-
a defective reverse current cutout relay.
-
a stepdown transformer and a rectifier.
Frage 82
Frage
If it is necessary to use an electrical connector where it may be exposed to moisture, the mechanic should
Antworten
-
coat the connector with grease.
-
use a special moisture- proof type.
-
spray the connector with varnish or zinc-chromate.
-
combined resistance and current-carrying capacity.
Frage 83
Frage
If one switch is used to control all navigation lights, the lights are most likely connected
Antworten
-
in series with each other and parallel to the switch.
-
in series with each other and in series with the switch.
-
parallel to each other and in series with the switch.
-
parallel with the switch
Frage 84
Frage
If several long lengths of electrical cable are to be installed in rigid conduit, the possibility of damage to the cable as it is pulled through the conduit will be reduced by
Antworten
-
dusting the cable with powdered graphite.
-
dusting the cable with powdered soapstone.
-
applying a light coat of dielectric grease.
-
prevent development of radio frequency potentials.
Frage 85
Frage
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
Antworten
-
correctly.
-
low voltage.
-
backwards.
-
parallel.
Frage 86
Frage
If the IDG scavenge oil filter is contaminated with chunks or pieces of metal
Antworten
-
change the oil at 25 hour intervals.
-
"remove and replace the IDG."
-
"replace the oil and filter at 25 hour intervals."
-
oil spray.
Frage 87
Frage
If the positive field lead between a generator and a generator control panel breaks and is shorted while the engine is running, a voltmeter connected to generator output would indicate
Antworten
-
zero voltage.
-
residual voltage.
-
normal voltage.
-
Hight voltage
Frage 88
Frage
In aircraft electrical systems, automatic reset circuit breakers
Antworten
-
circuits each pole can complete through the switch.
-
are useful where only temporary overloads are normally encountered.
-
must be used in all circuits essential to safe operation of the aircraft.
-
should not be used as circuit protective devices.
Frage 89
Frage
In an ac circuit with no phase lead or lag, which is true?
Antworten
-
Real power is zero.
-
Real power is greater than apparent power.
-
Real power equals apparent power.
-
Both fields are shunted across the armature.
Frage 90
Frage
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 alternator can deliver, the ammeter can be redlined at what percent of the generator or alternator rating?
Antworten
-
50
-
75
-
100
-
125
Frage 91
Frage
In the American Wire Gauge (AWG) system of numbers used to designate electrical wire sizes, the number assigned to a size is related to its
Antworten
-
combined resistance and current-carrying capacity.
-
current-carrying capacity.
-
cross-sectional area.
-
should not be used as circuit protective devices.
Frage 92
Frage
In troubleshooting an electrical circuit, if an ohmmeter is properly connected across a circuit component and some value of resistance is read,
Antworten
-
the component has continuity and is open.
-
either the component or the circuit is shorted.
-
the component has continuity and is not open.
-
circuit breaker activation.
Frage 93
Frage
Integrated drive generators (IDG) employ a type of high output ac generator that utilizes
Antworten
-
"brushes and slip rings to carry generated dc exciter current to the rotating field.
-
"battery current to excite the field.
-
a brushless system to produce current.
-
either the component or the circuit is shorted.
Frage 94
Frage
La batería cumple como función
Antworten
-
Suplir las necesidades básicas eléctricas del avión en caso de falla.
-
Mantener los motores encendidos
-
Mantener la Navegación del Avión
-
Poder encender los radios de VHF
Frage 95
Frage
La característica principal de un sistema eléctrico de corriente A.C. con generadores aislados es que:
Antworten
-
El sistema solo funciona con A.C.
-
El voltaje de alterna solamente es de 115/200v a 400 CPS
-
La corriente de directa se obtiene únicamente a partir de inversores
-
No permite que corriente proveniente de dos o más fuentes distintas se mezclen en una sola baRRA
Frage 96
Frage
"La corriente AC en el avion se convierte en DC por medio de:"
Antworten
-
Capacitores
-
"TRUs (Transformer Rectifier Units)"
-
Diodos
-
Densímetros
Frage 97
Frage
"La corriente DC del Avion se convierte a AC por medio de:"
Antworten
-
"TRUS (Transformer Rectifier Unit)"
-
Diodos
-
Inversores
-
Capacitores
Frage 98
Frage
La corriente de arranque de un motor ambobinado en serie, al pasar a través de ambos embobinados, el del campo y el de la armadura, produce una
Antworten
-
Torsión baja de arranque.
-
Velocidad un poco mayor cuando no tiene carga.
-
Torsión alta de arranque.
-
La frecuencia y el voltaje deben ser ambos iguales.
Frage 99
Frage
La misión principal del panel de control de barras es: El control del correcto funcionamiento de la C.S.D. lo observamos en la cabina en los siguientes indicadores:
Antworten
-
Controlar el exceso de carga
-
Controlar el bajo voltaje
-
Controlar el relé del generador
-
Detección de barra sin corriente
Frage 100
Frage
La unidad hidráulica de la C.S.D encontramos:
Antworten
-
Eje portador, unidad fija, unidad variable, cilindro de control, diferencial de engranajes y planetarios
-
Unidad hidráulica variable, unidad hidráulica fija, diferencial de engranajes y planetarios.
-
Unidad hidráulica variable, unidad hidráulica fija, eje portador de entrada y un cilindro de control
-
Unidad hidráulica variable, un sistema de gobierno de velocidad y un cilindro de control
Frage 101
Frage
Los aviones para atender sus demandas de energía eléctrica utilizan básicamente los siguientes tipos de corriente:
Antworten
-
Corriente alterna 115/200 voltios a 400 c.p.s., corriente alterna 28 voltios y corriente continua a 28 voltios
-
Corriente alterna 115/200 voltios a 400 c.p.s., corriente alterna 28 voltios y corriente continua trifásica a 28 voltios a 400 c.p.s.
-
Corriente alterna 115/200 voltios a 400 c.p.s., corriente alterna 28 voltios y corriente continua monofásica a 28 voltios
-
Corriente alterna 115/200 voltios a 400 c.p.s., corriente alterna 28 voltios y corriente continua bifásica a 28 voltios
Frage 102
Frage
Los generadores del avión, generalmente se encuentran ubicados en:
Antworten
-
Los motores
-
En el sistema Neumático
-
En el sistema hidráulico
-
En los alojamientos de los trenes de aterrizaje
Frage 103
Frage
Oil canning of the sides of aluminum or steel electrical junction boxes is considered to be
Antworten
-
normal operation in vibration prone areas.
-
a shorting hazard.
-
acceptable operation.
-
Structural.
Frage 104
Frage
One advantage of using ac electrical power in aircraft is
Antworten
-
that ac electrical motors can be reversed while dc motors cannot.
-
greater ease in stepping the voltage up or down.
-
"that the effective voltage is 1.41 times the maximum instantaneous voltage; therefore, less power input is required."
-
rectifiers which use the aircraft's ac generators as a source of power.
Frage 105
Frage
Para que el relé de salida del generador se cierre deben cumplirse dos condiciones:
Antworten
-
"Que se ponga el interruptor correspondiente de cabina en ON y que lo permita el panel de control"
-
"Que se ponga el interruptor correspondiente de cabina en RESET y que lo permita el panel de control"
-
Que lo permita el panel de control y que el APU este disponible
-
Que lo permita el panel de control y que la EXTERNAL POWER este disponible
Frage 106
Frage
Residual voltage is a result of magnetism in the
Antworten
-
field windings.
-
field shoes.
-
armature.
-
an integral fan.
Frage 107
Frage
Si un generador está equipado con un regulador de voltaje de tipo vibrador, el único momento en que los puntos del vibrador permenecen abiertos
Antworten
-
La potencia de salida del motor pueda ser controlada de mas cerca.
-
Está controlado por la separación (clearance) de los puntos del relay de corte de corriente inversa.
-
Es aumentada cuando la carga externa es mayor que la salida del generador.
-
Depende en la carga que lleva el generador.
Frage 108
Frage
Terminales de alambre eléctrico para la mayoría de las aplicaciones de aeronaves deben ser del tipo
Antworten
-
Ranurado.
-
Gancho.
-
Anillo.
-
Obturado
Frage 109
Frage
The circuit breaker in the instrument lighting system protects the
Antworten
-
lights from too much current.
-
wiring from too much current.
-
inverters which use the aircraft's ac generators as a source of power.
-
wiring from too much voltage.
Frage 110
Frage
The generator rating is usually found stamped on the
Antworten
-
firewall.
-
generator.
-
engine.
-
Energy
Frage 111
Frage
The inductor-type inverter output voltage is controlled by the
Antworten
-
number of poles and the speed of the motor.
-
voltage regulator.
-
dc stator field current.
-
resistance of the generator field circuit.
Frage 112
Frage
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
Antworten
-
by means of a inverter.
-
by means of a rectifier.
-
by means of a transformer.
-
be removed from the generator housing.
Frage 113
Frage
The most common method of attaching a pin or socket to an individual wire in an MS electrical connector is by
Antworten
-
crimping.
-
soldering.
-
crimping and soldering.
-
Rolling
Frage 114
Frage
The most common method of regulating the voltage output of a compound dc generator is to vary the
Antworten
-
current flowing through the shunt field coils.
-
total effective field strength by changing the reluctance of the magnetic circuit.
-
resistance of the series field circuit.
-
Rotate the positive brush one commutator segment.
Frage 115
Frage
The nominal rating of electrical switches refers to continuous
Antworten
-
current rating with the contacts open.
-
voltage rating with the contacts closed.
-
current rating with the contacts closed.
-
the system voltage and cable length.
Frage 116
Frage
The overvoltage control automatically protects the generator system when excessive voltage is present by
Antworten
-
opening the shunt field circuit.
-
opening and resetting the field control relay.
-
breaking a circuit to the trip coil of the field control relay.
-
increasing the output of the low generator to equal the output of the high generator.
Frage 117
Frage
The pin section of an AN/MS connector is normally installed on
Antworten
-
the power supply side of a circuit.
-
the ground side of a circuit.
-
"either side of a circuit (makes no difference)."
-
resistance in the rotor windings.
Frage 118
Frage
The poles of a generator are laminated to
Antworten
-
reduce flux losses.
-
increase flux concentration.
-
reduce eddy current losses.
-
an infinitely variable mechanical gearing system.
Frage 119
Frage
The primary considerations when selecting electric cable size are
Antworten
-
current-carrying capacity and allowable voltage drop.
-
the voltage and amperage of the load it must carry.
-
the system voltage and cable length.
-
input voltage must be maintained at a constant value.
Frage 120
Frage
The purpose of a rectifier in an electrical system is to change
Antworten
-
the frequency of alternating current.
-
direct current to alternating current.
-
alternating current to direct current.
-
Real power is zero.
Frage 121
Frage
The strength of the core of an electromagnet depends upon the material from which it is constructed and which of the following?
Antworten
-
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.
-
The size (cross section) and the number of turns of wire in the coil and the applied voltage.
-
resistance in the generator output circuit.
Frage 122
Frage
The three kinds of circuit-protection devices used most commonly in aircraft circuits are
Antworten
-
circuit breakers, resistors, and current limiters.
-
circuit breakers, fuses, and current limiters.
-
circuit breakers, capacitors, and current limiter plug-ins mechanical reset types.
-
wrapping with electrical tape.
Frage 123
Frage
The voltage in an ac transformer secondary that contains twice as many loops as the primary will be
Antworten
-
greater and the amperage less than in the primary.
-
"greater and the amperage greater than in the primary."
-
less and the amperage greater than in the primary.
-
by means of a rectifier.
Frage 124
Frage
The voltage output of an alternator may be regulated by controlling the
Antworten
-
speed of the alternator.
-
voltage output of the dc exciter.
-
resistance in the rotor windings.
-
dusting the cable with powdered soapstone.
Frage 125
Frage
To help minimize radio interference a capacitor will largely eliminate and provide a steady direct current if the capacitor is connected to the generator in
Antworten
-
parallel.
-
series.
-
series/parallel.
Frage 126
Frage
Un propósito de la puerta de inducidos (growler test) es para determinar la presencia de
Antworten
-
Un conmutador con deformación circunferencial.
-
Un cable de campo roto.
-
Una armadura en corto.
-
Ranurado.
Frage 127
Frage
What is a method used for restoring generator field residual magnetism?
Antworten
-
Flash the fields.
-
Reseat the brushes.
-
Energize the armature.
-
show very low resistance if it is a series field coil.
Frage 128
Frage
What is an important factor in selecting aircraft fuses?
Antworten
-
The current exceeds a predetermined value.
-
The voltage rating should be lower than the maximum circuit voltage.
-
Capacity matches the needs of the circuit.
-
greater ease in stepping the voltage up or down.
Frage 129
Frage
What is normally used to bond noncontinuous stainless steel aircraft components?
Antworten
-
Stainless steel jumpers.
-
Copper jumpers.
-
Aluminum jumpers.
-
Iron steel copper
Frage 130
Frage
What is the advantage of a circuit breaker when compared to a fuse?
Antworten
-
Never needs replacing.
-
Always eliminates the need of a switch.
-
Resettable and reusable.
-
It breaks circuit quickly.
Frage 131
Frage
What is the advantage of a current limiter?
Antworten
-
It breaks circuit quickly.
-
It can be reset easily.
-
It will take overload for a short period.
-
Always eliminates the need of a switch.
Frage 132
Frage
What is the frequency of an alternator dependent upon?
Antworten
-
Voltage.
-
RPM.
-
Current.
-
Watts
Frage 133
Frage
What is the maximum amount of time a circuit can be in operation and still be an intermittent duty circuit?
Antworten
-
Three minutes.
-
Two minutes.
-
One minute.
-
Ten minutes
Frage 134
Frage
What is the purpose of the selection of derated switches for known continuous load current applications?
Antworten
-
To calculate the voltage drop across the circuit.
-
"To prevent short circuits in the motor field windings."
-
To obtain reasonable switch efficiency and service life.
-
The current exceeds a predetermined value.
Frage 135
Frage
What is the ratio of turns between the primary coil winding and the secondary coil winding of a transformer designed to triple its input voltage?
Antworten
-
Primary will have one- third as many turns as its secondary.
-
Primary will have twice as many turns as its secondary.
-
Primary will have three times as many turns as its secondary.
-
Both fields are shunted across the armature.
Frage 136
Frage
"What is the voltage drop for a No. 18 copper wire 50 feet long to carry 12.5 amperes, continuous operation? Use the formula VD = RLA VD = Voltage drop R = Resistance per ft = .00644 L = Length of wire A = Amperes"
Antworten
-
1/2V.
-
1V.
-
4V.
-
2V.
Frage 137
Frage
What kind of switch should you install in a single wire circuit that required the switch to be manually held in the ON position?
Antworten
-
Single-pole, single-throw (SPST), two-position normally open (NO).
-
"Single-pole, single-throw (SPST), single-position."
-
Single-pole, double-throw (SPDT), single-position normally open (NO).
-
"Dual-pole, single-throw (DPST), single-position."
Frage 138
Frage
What protection to wires and cables does conduit provide when used in aircraft installations?
Antworten
-
Electromagnetic.
-
Mechanical.
-
Structural.
-
Chemical
Frage 139
Frage
When adding a rheostat to a light circuit to control the light intensity, it should be connected in
Antworten
-
parallel with the light.
-
series with the light.
-
series parallel with the light switch.
-
parallel with the switch
Frage 140
Frage
When considering an alteration, the criteria upon which the selection of electric cable size should be based are
Antworten
-
applied voltage and allowable voltage drop.
-
current-carrying capacity and allowable voltage drop.
-
current-carrying capacity and applied voltage.
-
The current exceeds a predetermined value.
Frage 141
Frage
When dc generators are operated in parallel 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
Antworten
-
increasing the output of the low generator to equal the output of the high generator.
-
"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.
-
total effective field strength by changing the reluctance of the magnetic circuit.
Frage 142
Frage
"When necessary during operation, CSD disconnect is usually accomplished by"
Antworten
-
a switch in the cockpit.
-
circuit breaker activation.
-
a shear section in the input shaft.
-
the component has continuity and is not open.
Frage 143
Frage
When using an ohmmeter to check the continuity of a generator field coil, the coil should
Antworten
-
be removed from the generator housing.
-
show high resistance when the meter prods are connected to the terminals of the coil.
-
show very low resistance if it is a series field coil.
-
opening the shunt field circuit.
Frage 144
Frage
When using the voltage drop method of checking circuit resistance, the
Antworten
-
input voltage must be maintained at a constant value.
-
output voltage must be maintained at a constant value.
-
input voltage must be varied.
-
the voltage and amperage of the load it must carry.
Frage 145
Frage
Where electric cables must pass through holes in bulkheads, formers, ribs, firewalls, etc., the wires should be protected from chafing by
Antworten
-
wrapping with electrical tape.
-
using a suitable grommet.
-
wrapping with plastic.
-
wiring from too much voltage.
Frage 146
Frage
Which of the following copper electrical cable sizes should be selected to replace a No. 6 aluminum electrical cable?
Antworten
-
No. 4.
-
No. 6.
-
No. 8.
-
No. 10.
Frage 147
Frage
Which of the following must be accomplished when installing an anticollision light?
Antworten
-
Install a switch independent of the position light switch.
-
Use shielded electrical cable to assure fail-safe operation.
-
Connect the anticollision light to the aircraft position light switch.
-
The number of turns of wire in the coil and the applied voltage.
Frage 148
Frage
Which of the following should be accomplished in the installation of aircraft wiring?
Antworten
-
Support the bundle to structure and/ or solid fluid lines to prevent chafing damage.
-
Provide adequate slack in the wire bundle to compensate for large changes in temperature.
-
Locate the bundle above flammable fluid lines and securely clamp to structure.
-
only plain nuts and lockwashers have been used for terminal attachment to the studs.
Frage 149
Frage
Which statement relating to electric wiring is true?
Antworten
-
When attaching a terminal to the end of an electric cable, it should be determined that the strength of the cable-to- terminal joint is at least twice the tensile strength of the cable.
-
electrical unit in the circuit and should be located as close to the source as possible.
-
"All electric cable splices should be covered with soft insulating tubing (spaghetti) for mechanical protection against external abrasion."
-
When attaching a terminal to the end of an electric cable, it should be determined that the strength of the cable-to- terminal joint is at least equal to the tensile strength of the cable itself.
Frage 150
Frage
Why are the iron cores of most induction coils laminated?
Antworten
-
To reduce the core reluctance.
-
To increase the core permeability.
-
To reduce the effects of eddy currents.
-
Energize the armature.
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