1053. A series-wound dc electric motor will normally require 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.
1054. 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. Series wound. varying current flow to generator field coil.
1055. 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. to prevent circuit failure due to terminal disconnection.
1056. An ammeter in a battery charging system is for the purpose of indicating the amperage available for use. total amperes being used in the airplane. rate of current used to charge the battery. stripping nicks can cause short circuits.
1057. For general electrical use in aircraft, the acceptable method of attaching a terminal to a wire is by crimping. soldering. crimping and soldering. Rolling.
1058. How can it be determined if a transformer winding has some of its turns shorted together? 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.
1059. How does the magnetic brake used to stop rotation of an electric motor armature operate? 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.
1060. How many cycles of ac voltage are produced in a six-pole alternator of the revolving-field type for each revolution of the rotor? Four Three. Six. Two.
1061. If a generator is equipped with a vibrator-type voltage regulator, the actual time the voltage regulator points remain open 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.
1062. 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 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.
1063. One purpose of a growler test is to determine the presence of an out-of-round commutator. a broken field lead. a shorted armature. power output of the motor can be more closely controlled.
1064. 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 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.
1065. The method most often used in overcoming the effect of armature reaction is through the use of 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.
1066. 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 strength of the magnetic field. number of conductors in the armature. speed at which the armature rotates. amperes and frequency must both be equal.
1067. The pole pieces or shoes used in a dc generator are a part of the armature assembly. field assembly. brush assembly. brush assembly.
1068. The starting current of a series-wound dc motor, in passing through both the field and armature windings, produces a low starting torque. speed slightly higher when unloaded. high starting torque. Starter motor.
1069. The type of electric wire terminals used for most aircraft applications, in addition to providing good current carrying capabilities, are designed primarily to prevent circuit failure due to terminal disconnection. for uncomplicated and rapid circuit connection and disconnection. for permanent connection to the circuit. Reduce field strength.
1070. To test generator or motor armature windings for opens, 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.
1071. To what depth is the mica insulation between the commutator bars of a dc generator undercut? 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.
1072. What is a cause of generator brush arcing? Seating brushes with No. 000 sandpaper. Carbon dust particles. Low spring tension. amperes and voltage must both be equal.
1073. What is the color and orientation of the position lights for navigation on civil airplanes? Left side - green, right side - red, rear aft - white. 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.
1074. What is the minimum bend radius for an electrical wire bundle? 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.
1075. What is the most accurate type of frequency-measuring instrument? Integrated circuit chip having a clock circuit. Electrodynamometers using electromagnetic fields. Electromagnets using one permanent magnet. checked with a milliamp ammeter.
1076. What is the principal advantage of the series-wound dc motor? High starting torque. Suitable for constant speed use. Low starting torque. speed of the motor can be more closely controlled.
1077. When ac generators are operated in parallel, the amperes and frequency must both be equal. frequency and voltage must both be equal. amperes and voltage must both be equal. shaded poles.
1078. When approved, splices may be used to repair manufactured harnesses or installed wiring. The maximum number of splices permitted between any two connectors is Four Two Three one.
1079. Which motor would be most likely to have an armature brake? Starter motor. Landing light retraction motor. Inverter drive motor. field assembly.
1080. Which of the following is most likely to cause thermal runaway in a nickel-cadmium battery? 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.
1081. Which type of dc generator is not used as an airplane generator? Externally grounded. Series wound. Compound wound. Shunt-type ohmmeter.
1082. Electric wire terminals for most aircraft applications must be what type? Slotted. Hook. Ring. Tappered.
1083. How should the splices be arranged if several are to be located in an electrical wire bundle? Staggered along the length of the bundle. Grouped together to facilitate inspection. Enclosed in a conduit. soldering.
1084. In a generator, what eliminates any possible sparking to the brush guides caused by the movement of the brushes within the holder? 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.
1085. Some electric motors have two sets of field windings wound in opposite directions so that the 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.
1086. What type of instrument is used for measuring very high values of resistance? Megohmmeter. Shunt-type ohmmeter. Multimeter. introducing a resistance in generator-to-battery lead in the event of overload.
1087. When a diode is checked for an open circuit or a short circuit, it should be in the circuit. checked with a milliamp ammeter. disconnected from the circuit. Electromagnets using one permanent magnet.
1088. When handling a high voltage capacitor in an electrical circuit, be sure it 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.
1089. Which of the following is not one of the purposes of interpoles in a generator? Reduce field strength. Overcome armature reaction. Reduce arcing at the brushes. stripping nicks can cause short circuits.
1090. ¿Que actividades realiza el relé de protección diferencial? 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.
1091. A battery-generator system provides direct current. On installations requiring alternating current from the battery- generator system, it is necessary to have a transformer. a magnetically operated switch. a variable resistor between the battery and generator. an inverter.
1092. A certain switch is described as a single-pole, double-throw switch (SPDT). The throw of a switch indicates the number of circuits each pole can complete through the switch. terminals at which current can enter or leave the switch. places at which the operating device (toggle, plunger, etc.) will come to rest and at the same time open or close a circuit. are useful where only temporary overloads are normally encountered.
1093. A circuit breaker is installed in an aircraft electrical system primarily to protect the 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.
1094. A circuit protection device called a current limiter is essentially a slow-blow fuse and is designed to be used in 400 cycle AC circuits. heavy power circuits. starter-generator circuits. Pass through conduit.
1095. A CSD unit drives a generator through the use of a synchronous electric motor. an infinitely variable mechanical gearing system. a variable hydraulic pump and hydraulic motor. increase flux concentration.
1096. A relay is 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. the frequency of alternating current.
1097. A voltage regulator controls generator voltage by changing the 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.
1098. Aircraft electrical junction boxes located in a fire zone are usually constructed of asbestos. cadmium-plated steel. Iron steel copper stainless steel.
1099. Aircraft fuse capacity is rated in.
volts. ohms. amperes. Watts.
1100. 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 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.
1101. Algunos motores eléctricos tienen dos juegos de embobinados de campo en direcciones opuestas de forma tal que 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.
1102. Bonding connections should be tested for resistance value. amperage value. Reactance Alternator.
1103. 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 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.
1104. Circuits that must be operated only in an emergency or whose inadvertent activation could endanger a system frequently employ 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.
1105. CSD driven generators are usually cooled by oil spray. an integral fan. both ram air and an integral fan. battery current to excite the field.
1106. Cuál es la ventaja principal de un motor de corriente continua (direct current, DC) embobinado en serie? Velocidad variable Adecuado para uso a velocidad constante. Baja torsión de arranque. Alta torsión de arranque.
1107. Cuál es una causa de que arqueen las brochas del generador? Asentar las brochas con papel de lija númemro 000. Partículas de polvo de carbón. Poca tensión en los resortes. Polvo y condiciones ambientales.
1108. Cuando dos o más generadores de corriente alterna se van a conectar en paralelo, se deben cumplir las siguientes condiciones antes de su conexión: 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.
1109. Cuando generadores de corriente alterna son operados en paralelo, 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.
1110. 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: Exceso de revoluciones de la C.S.D Barra defectuosa Exceso de revoluciones del motor Batería descargada.
1111. During inspection of an anticollision light installation for condition and proper operation, it should be determined that 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.
1112. During inspection of the terminal strips of an aircraft electrical system, it should be determined that 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.
1113. El APU posee como backup para encendido: Bateria y Bomba de Combustible de DC Bateria del Avion HMG IDG.
1114. El APU proporciona al avión: Potencia Neumática Potencia Eléctrica Potencia Hidráulica Potencia Neumática y Eléctrica.
1115. El avión se puede alimentar eléctricamente externamente por medio de: APU GPU (Ground Power Unit) Arrancador Neumático. Arrancador eléctrico.
1116. El control del correcto funcionamiento de la C.S.D. lo observamos en la cabina en los siguientes indicadores: 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.
1117. 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: La ley de Lenz La ley de Ampere La ley de Faraday La ley de Coulomb.
1118. El generador del Avion genera con una frecuencia de: 60 Hz 50 Hz 120 Hz 400 Hz.
1119. El reparto de la carga reactiva de cada generador es controlado por: El relé del generador El relé de la barra de enlace El regulador de voltaje El APU.
1120. El sistema eléctrico del avión permite utilizar la batería en tierra para: Operar los sistemas utilitarios Mantener la temperatura de cabina. Mantener el sistema de combustible encendido siempre Mantener la presión de la cabina.
1121. Electric circuits are protected from overheating by means of thermocouples. Snunts fuses. cadmium-plated steel.
1122. 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 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.
1123. En el regulador de voltaje del sistema eléctrico utilizado normalmente en los generadores encontramos las siguientes partes: 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.
1124. Entre las componentes del inversor de tipo estático tenemos: 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.
1125. Generalmente de las Barras de DC se conectan: Sistemas básicos del avión Sistemas esenciales y de emergencia Sistemas poco importantes Sistemas Obsoletos.
1126. Grounding is electrically connecting a conductive object to the primary structure. One purpose of grounding is to prevent current return paths. allow static charge accumulation. prevent development of radio frequency potentials. push-pull-type circuit breakers only (no switches).
1127. How are generators rated? Watts at rated voltage. Amperes at rated voltage. The impedance at rated voltage. Current.
1128. How can the direction of rotation of a dc electric motor be changed? 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.
1129. 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 at right angles to stringers or ribs. Coaxial cables are routed as directly as possible. Coaxial wires.
1130. How is a shunt-wound dc generator connected? 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.
1131. How should a voltmeter be connected? In series with the source. In parallel with the load. In series with the load. In series with the source.
1132. If a wire is installed so that it comes in contact with some moving parts, what protection should be given the wire? Wrap with soft wire solder into a shield. Wrap with friction tape. Pass through conduit. wrapping with plastic.
1133. If any one generator in a 24-volt dc system shows low voltage, the most likely cause is an out-of-adjustment voltage regulator. shorted or grounded wiring. a defective reverse current cutout relay. a stepdown transformer and a rectifier.
1134. If it is necessary to use an electrical connector where it may be exposed to moisture, the mechanic should 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.
1135. If one switch is used to control all navigation lights, the lights are most likely connected 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.
1136. 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 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.
1137. 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. parallel.
1138. If the IDG scavenge oil filter is contaminated with chunks or pieces of metal change the oil at 25 hour intervals. remove and replace the IDG. replace the oil and filter at 25 hour intervals. oil spray.
1139. 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 zero voltage. residual voltage. normal voltage. Hight voltage.
1140. In aircraft electrical systems, automatic reset circuit breakers 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.
1141. In an ac circuit with no phase lead or lag, which is true? Real power is zero. Real power is greater than apparent power. Real power equals apparent power. Both fields are shunted across the armature.
1142. 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? 50 75 100 125.
1143. 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 combined resistance and current- carrying capacity. current-carrying capacity. cross-sectional area. should not be used as circuit protective devices.
1144. In troubleshooting an electrical circuit, if an ohmmeter is properly connected across a circuit component and some value of resistance is read, 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.
1145. Integrated drive generators (IDG) employ a type of high output ac generator that utilizes 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.
1146. La batería cumple como función Suplir las necesidades básicas eléctricas del avión en caso de falla. Mantener los motores encendidos Poder encender los radios de VHF Mantener la Navegación del avion.
1147. La característica principal de un sistema eléctrico de corriente A.C. con generadores aislados es que: 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.
1148. La corriente AC en el avion se convierte en DC por medio de: Capacitores. TRUs (Transformer Rectifier Units) Diodos Inversores.
1149. La Corriente DC del avion se convierte a AC por medio de: TRUS (Transformer Rectifier Unit) Diodos Inversores Capacitores.
1150. 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 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.
1151. 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: Controlar el exceso de carga Controlar el bajo voltaje Controlar el relé del generador Detección de barra sin corriente.
1152. La unidad hidráulica de la C.S.D encontramos: 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.
1153. Los aviones para atender sus demandas de energía eléctrica utilizan básicamente los siguientes tipos de corriente: 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.
1154. Los generadores del avión, generalmente se encuentran ubicados en: Los motores En el sistema Neumático En el sistema hidráulico En los alojamientos de los trenes de aterrizaje.
1155. Oil canning of the sides of aluminum or steel electrical junction boxes is considered to be normal operation in vibration prone areas. a shorting hazard. acceptable operation. Structural.
1156. One advantage of using ac electrical power in aircraft is 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.
1157. Para que el relé de salida del generador se cierre deben cumplirse dos condiciones: 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.
1158. Residual voltage is a result of magnetism in the field windings. field shoes. armature. an integral fan.
1159. Si un generador está equipado con un regulador de voltaje de tipo vibrador, el único momento en que los puntos del vibrador permenecen abiertos 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.
1160. Terminales de alhambre eléctrico para la mayoría de las aplicaciones de aeronaves deben ser del tipo Ranurado. Gancho. Anillo. Obturado.
1161. The circuit breaker in the instrument lighting system protects the lights from too much current. wiring from too much current. wiring from too much voltage. inverters which use the aircraft's ac generators as a source of power.
1162. The generator rating is usually found stamped on the firewall. generator. engine. Energy.
1163. The inductor-type inverter output voltage is controlled by the number of poles and the speed of the motor. voltage regulator. dc stator field current. resistance of the generator field circuit.
1164. 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 rectifier. by means of a transformer. be removed from the generator housing.
1165. The most common method of attaching a pin or socket to an individual wire in an MS electrical connector is by crimping. Soldering crimping and soldering. Rolling.
1166. 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. 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.
1167. The nominal rating of electrical switches refers to continuous current rating with the contacts open. voltage rating with the contacts closed. current rating with the contacts closed. the system voltage and cable length.
1168. The overvoltage control automatically protects the generator system when excessive voltage is present by 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.
1169. The pin section of an AN/MS connector is normally installed on 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.
1170. The poles of a generator are laminated to reduce flux losses. increase flux concentration. reduce eddy current losses. an infinitely variable mechanical gearing system.
1171. The primary considerations when selecting electric cable size are 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.
1172. The purpose of a rectifier in an electrical system is to change the frequency of alternating current. direct current to alternating current. alternating current to direct current. Real power is zero.
1173. The strength of the core of an electromagnet depends upon the material from which it is constructed and which of the following? 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.
1174. The three kinds of circuit-protection devices used most commonly in aircraft circuits are 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.
1175. The voltage in an ac transformer secondary that contains twice as many loops as the primary will be 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.
1176. The voltage output of an alternator may be regulated by controlling the speed of the alternator. voltage output of the dc exciter. resistance in the rotor windings. dusting the cable with powdered soapstone.
1177. 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 parallel. Series series/parallel.
1178. Un propósito de la puerta de inducidos (growler test) es para determinar la presencia de Un conmutador con deformación circunferencial. Un cable de campo roto. Una armadura en corto. Ranurado.
1179. What is a method used for restoring generator field residual magnetism? Flash the fields. Reseat the brushes. Energize the armature. show very low resistance if it is a series field coil.
1180. What is an important factor in selecting aircraft fuses? 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.
1181. What is normally used to bond noncontinuous stainless steel aircraft components? Stainless steel jumpers. Copper jumpers. Aluminum jumpers. Iron steel copper.
1182. What is the advantage of a circuit breaker when compared to a fuse? Never needs replacing. Always eliminates the need of a switch. Resettable and reusable. It breaks circuit quickly.
1183. What is the advantage of a current limiter? It breaks circuit quickly. It can be reset easily. It will take overload for a short period. Always eliminates the need of a switch.
1184. What is the frequency of an alternator dependent upon? Voltage. RPM. Current Watts.
1185. What is the maximum amount of time a circuit can be in operation and still be an intermittent duty circuit? Three minutes. Two minutes. One minute. Ten minutes.
1186. What is the purpose of the selection of derated switches for known continuous load current applications? 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.
1187. 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? 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.
1188. 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 1/2 V. 1 V. 4 V. 2 V.
1189. What kind of switch should you install in a single wire circuit that required the switch to be manually held in the ON position? 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.
1190. What protection to wires and cables does conduit provide when used in aircraft installations? Electromagnetic. Mechanical. Structural. Chemical.
1191. When adding a rheostat to a light circuit to control the light intensity, it should be connected in parallel with the light. series with the light. series parallel with the light switch. parallel with the switch.
1192. When considering an alteration, the criteria upon which the selection of electric cable size should be based are 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.
1193. 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 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.
1194. When necessary during operation, CSD disconnect is usually accomplished by a switch in the cockpit. circuit breaker activation. a shear section in the input shaft. the component has continuity and is not open.
1195. When using an ohmmeter to check the continuity of a generator field coil, the coil should 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.
1196. 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 voltage and amperage of the load it must carry.
1197. Where electric cables must pass through holes in bulkheads, formers, ribs, firewalls, etc., the wires should be protected from chafing by wrapping with electrical tape. using a suitable grommet. wrapping with plastic. wiring from too much voltage.
1198. Which of the following copper electrical cable sizes should be selected to replace a No. 6 aluminum electrical cable? No. 4. No. 6. No. 8. No. 10.
1199. Which of the following must be accomplished when installing an anticollision light? 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.
1200. Which of the following should be accomplished in the installation of aircraft wiring? 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.
1201. Which statement relating to electric wiring is true? 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.
1202. Why are the iron cores of most induction coils laminated? To reduce the core reluctance. To increase the core permeability. To reduce the effects of eddy currents. Energize the armature.
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