SISTEMAS ELECTRICOS PRIMERAS 50

1039. Sistemas Eléctricos- 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.

1040. Sistemas Eléctricos- 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.

1041. Sistemas Eléctricos- 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.".

1042 Sistemas Eléctricos "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.".

1043 Sistemas Eléctricos "For general electrical use in aircraft, the acceptable method of attaching a terminal to a wire is by". crimping. soldering. crimping and soldering. Rolling.

1044 Sistemas Eléctricos "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.".

1045 Sistemas Eléctricos 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.

1046 Sistemas Eléctricos "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.

1047 Sistemas Eléctricos "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.

1048 Sistemas Eléctricos 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.

1049 Sistemas Eléctricos "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.".

1050 Sistemas Eléctricos 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.

1051 Sistemas Eléctricos 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.".

1052 Sistemas Eléctricos "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.

1053 Sistemas Eléctricos "The pole pieces or shoes used in a dc generator are a part of the". armature assembly. field assembly. brush assembly. Inverter drive motor.

1054 Sistemas Eléctricos 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.

1055 Sistemas Eléctricos "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.

1056 Sistemas Eléctricos 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.

1057 Sistemas Eléctricos "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.

1058 Sistemas Eléctricos 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.".

1059 Sistemas Eléctricos "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.".

1060 Sistemas Eléctricos "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.".

1061 Sistemas Eléctricos "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.".

1062 Sistemas Eléctricos "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.".

1063 Sistemas Eléctricos 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.

1064 Sistemas Eléctricos 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.

1065 Sistemas Eléctricos "Which motor would be most likely to have an armature brake?". Starter motor. Landing light retraction motor. Inverter drive motor. field assembly.

1066 Sistemas Eléctricos 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.

1067 Sistemas Eléctricos "Which type of dc generator is not used as an airplane generator?". Externally grounded. Series wound. Compound wound. Shunt-type ohmmeter.

1068 Sistemas Eléctricos "Electric wire terminals for most aircraft applications must be what type?". Slotted. Hook. Ring. Tappered.

1069 Sistemas Eléctricos "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.

1070 Sistemas Eléctricos "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.

1071 Sistemas Eléctricos "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.

1072 Sistemas Eléctricos 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.".

1073 Sistemas Eléctricos "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.".

1074 Sistemas Eléctricos 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.

1075 Sistemas Eléctricos "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.".

1077 Sistemas Eléctricos "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.

1078 Sistemas Eléctricos 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.

1079 Sistemas Eléctricos 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.

1080 Sistemas Eléctricos 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.

1081 Sistemas Eléctricos 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.

1082 Sistemas Eléctricos 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.

1083 Sistemas Eléctricos 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.".

1084 Sistemas Eléctricos "Aircraft electrical junction boxes located in a fire zone are usually constructed of". asbestos. cadmium-plated steel. Iron steel copper. stainless steel.

1085 Sistemas Eléctricos Aircraft fuse capacity is rated in. volts. ohms. amperes. Watts.

1086 Sistemas Eléctricos "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.

1088 Sistemas Eléctricos Bonding connections should be tested for. resistance value. amperage value. reactance. Alternator.

1089 Sistemas Eléctricos 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.

1090 Sistemas Eléctricos "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.