Aircraft Electrical Practice Test

These questions are part of the practice quiz. Start practicing

• What characteristic is produced by the starting current of a series-wound DC motor?
• Which factors must be considered when determining the wire size for an aircraft installation?
• What is the primary method for regulating the voltage output of an alternator?
• What is the effect of armature current in a series-wound DC motor during startup?
• When attaching a terminal to an electric cable, what should be true about the joint's strength?
• How can it be determined if a transformer winding has some of its turns shorted together?
• During electrical installation, how far should wire bundles be located away from fluid lines?
• What is the correct method to test generator or motor armature windings for opens?
• Which of the following is NOT one of the three most common circuit-protection devices in aircraft?
• What is a crucial consideration when selecting aircraft fuses?
• What type of switch installation is designed to prevent accidental activation?
• What is the effect of reverse polarity on electrical components?
• When moisture exposure is a concern, what type of connector should be used?
• What is the maximum number of splices permitted between any two connectors in an aircraft?
• Which of the following is generally NOT a function of circuit breakers in aircraft electrical systems?
• A series-wound DC electric motor typically requires more current at which operating condition?
• How can electrical systems be tested in aircraft maintenance?
• What type of electrical power is primarily used for aircraft avionics systems?
• What does AC stand for in the context of aircraft electrical systems?
• What kind of switch is commonly used for dual battery systems in aircraft?
• What is the consequence of a circuit lacking continuity?
• What is the primary purpose of avionics in an aircraft?
• Which type of electrical circuit typically requires the installation of a current limiter?
• Which aircraft electrical system component provides back-up power?
• In an aircraft electrical installation, what is an advantage of using crimped connections?
• What method is most commonly used to correct armature reaction in electric motors?
• What must be tested in bonding connections to ensure proper installation?
• What function does an inverter serve in an aircraft's electrical system?
• What should be done to protect wires from chafing when passing through bulkheads?
• What is the function of a transformer in an aircraft electrical system?
• What component visually indicates a blown fuse in an aircraft?
• What is the role of the electrical load analysis in aircraft maintenance?
• When generating an AC signal, what does the transformer do to the voltage?
• What is an example of a passive electrical component in aviation?
• What type of switch controls the navigation lights with a simple ON and OFF function?
• Why are derated switches selected for continuous load current applications?
• In an aircraft electrical system, what is a bus tie?
• For which purpose should circuit breakers be mounted in an aircraft system?
• What should be considered the highest priority when selecting fuses for aircraft applications?
• In what scenario is an aircraft's emergency electrical system activated?
• What should be done if an electrical component is suspected to be faulty?
• What is the function of a circuit breaker in an aircraft?
• In the American Wire Gauge (AWG) system, what does the AWG number designate?
• What does the throw of a switch refer to?
• How should electric cables be protected when passing through holes in bulkheads or firewalls?
• If the positive field lead between a generator and the control panel breaks and shorts while the engine is running, what will a voltmeter show?
• What does the oil canning of electrical junction boxes indicate?
• What should the resistance level of each bonding connection not exceed?
• Why are the iron cores of most induction coils laminated?
• When bundling open wiring in aircraft, what is a recommended practice?
• What is a key benefit of using multimeters in aircraft electrical maintenance?
• What type of electrical circuit connects multiple components in parallel?
• What is the most accurate type of frequency-measuring instrument?
• What happens when a diode is removed from the circuit for testing?
• What is the benefit of a current limiter in an electrical circuit?
• Which tool is often used for visual inspection of electrical connections?
• What factor does the actual time that the voltage regulator points remain open depend on?
• What must a technician confirm about the connection quality in aircraft electrical systems?
• What is the primary function of having two sets of field windings in certain electric motors?
• Which material is recommended for dusting electrical cables to reduce damage during installation in rigid conduit?
• What does the term "current" refer to in electricity?
• What does the term "phase" refer to in an AC electrical system?
• What type of circuit protective device must require manual restoration after tripping?
• What does the term "permissible voltage drop" refer to in electrical installations?
• What is the advantage of a 400 Hz electrical system in an aircraft?
• What is the consequence of using a wire that is too small in an aircraft installation?
• Why must aircraft electrical wire terminals be designed to prevent disconnection?
• When operating two aircraft AC generators in parallel, what must be equal?
• What is the purpose of fuses in an aircraft electrical system?
• What is the principle behind a circuit breaker in aircraft electrical systems?
• What is the primary function of a rectifier in electrical systems?
• What are the two primary sources of electrical power in an aircraft?
• What is the main advantage of using fiber optics in aircraft avionics?
• What is the primary advantage of using a circuit breaker over a fuse?
• Which type of circuit protection device resembles a slow-blow fuse?
• How are solid-state relays different from traditional relays?
• What component eliminates sparking to the brush guides in a generator?
• In an electrical circuit, what does a capacitor do?
• What does adequate slack in a wire bundle compensate for?
• Which of the following installations is most critical for aircraft wiring regarding safety?
• What does DC stand for in the context of aircraft electrical systems?
• What is the color and orientation of the position lights for navigation on civil airplanes?
• In the event of an electrical failure, what should a pilot do first?
• What type of electric wire terminal is required for most aircraft applications?
• What does a defective field lead in an electric motor typically indicate?
• If an AC transformer secondary has twice as many loops as the primary, what will be the voltage outcome?
• What is the purpose of grounding in aircraft electrical systems?
• What protection does a diode provide in electrical circuits?
• What is the primary role of a voltage regulator in an aircraft?
• In electrical systems, what does the term "ground" refer to?
• For general electrical use in aircraft, what is the acceptable method of attaching a terminal to a wire?
• For maintaining the safety of aircraft wiring, it is important to prevent which type of damage?
• When installing a rheostat to control light intensity, where should it be connected?
• How does the magnetic brake stop the rotation of an electric motor armature?
• In aircraft electrical systems, what is typically the main source of power?
• Which type of DC motor is best suited for applications requiring high starting torque?
• What type of jumpers are normally used to bond noncontinuous stainless steel aircraft components?
• To what standard should electrical installations in aircraft be rated for safety?
• What effect does a large initial start-up current have on a series-wound DC motor?
• A voltage regulator controls generator output by which method?
• What does the circuit breaker in the instrument lighting system primarily protect?
• What is the principal advantage of series-wound DC motors?
• What is one purpose of grounding a conductive object in an aircraft?
• What is a common function of LED lights in aircraft electrical systems?
• Why are circuit diagrams important in aircraft maintenance?
• What is the typical charge voltage for a 24V aircraft battery?
• What will happen if the reverse current cutout relay contacts fail to open when the generator output drops below battery potential?
• When handling a high voltage capacitor in an electrical circuit, you must ensure it is?
• What is a critical reason to avoid using automatic reset circuit breakers in aircraft?
• What safety precaution should be taken before servicing a high voltage capacitor?
• A single-pole, double-throw (SPDT) switch indicates what about its functionality?
• What does an electrical bus do in an aircraft's electrical system?
• During ground operations, how is aircraft generator cooling typically accomplished?
• What is the primary function of an aircraft's electrical system?
• When selecting electric cable size, which criteria is key?
• When selecting hardware for bonding connections to an aircraft structure, which factors should be considered?
• What is the purpose of power routing in aircraft electrical systems?
• Which of the following is NOT a purpose of interpoles in a generator?
• In electrical terms, what is resistance measured in?
• When checking circuit resistance using the voltage drop method, what must be maintained?
• What is "inrush current" in the context of aviation electrical systems?
• What is the primary purpose of circuit breakers in an aircraft electrical system?
• What is one of the primary functions of the end frame in a DC motor?
• What must be ensured during the inspection of terminal strips in an aircraft electrical system?
• What will a voltmeter read if the positive terminal is connected to the negative terminal of the source voltage?
• What situation is most likely to cause thermal runaway in a nickel-cadmium battery?
• Which type of switch is recommended for a circuit that must be manually held ON?
• What role does an inspection mirror play in electrical system maintenance?
• Why is it important to check for corrosion in aircraft electrical connections?
• When checking a diode for an open or short circuit, the diode should be?
• What is a method used to restore generator field residual magnetism?
• In a system without a current limiter, what is the maximum percent rating at which an ammeter can be redlined?
• What type of electrical component is used to provide steady direct current while minimizing radio interference?
• What is the purpose of an alternator in an aircraft?
• What is a common cause of brush arcing in motors?
• What is reduced when interpoles are used in a generator to overcome the armature reaction?
• What type of switches are frequently employed in circuits critical for safety to prevent inadvertent activation?
• To reduce radio interference, how should a capacitor be connected to the generator?
• What is the function of the aircraft's Master Switch?
• The pole pieces or shoes in a DC generator are part of which assembly?
• Why is load shedding important in aircraft electrical systems?
• What does "circuit continuity" mean in aviation?
• How does an overload relay protect electrical circuits?
• What does a wattmeter measure in an electrical system?
• Which device is used to measure very high values of resistance?
• A series-wound DC motor produces high starting torque. What happens to the current as speed increases?
• What would be the consequence of not grounding electrical equipment in an aircraft?
• AN/MS electrical connectors are specifically designed to meet which specifications?
• If all navigation lights are controlled by one switch, how are they likely connected?
• Which electrical component is primarily used to interrupt power in case of overload?
• What is the purpose of an ammeter in a battery charging system?
• What protective measure should be taken if a wire contacts moving parts in an aircraft?
• How does a voltage regulator primarily control generator output?
• How should coaxial cables be routed in relation to stringers or ribs?
• Which of the following are the major parts of a DC motor?
• What is the function of a voltage regulator in an aircraft?
• What role do fuses play in aircraft electrical systems?
• What is the primary method to maintain a constant voltage output from an aircraft generator under varying conditions?
• What occurs if armature reaction is not adequately corrected?
• What happens when the strength of the magnetic field in a DC generator is varied?
• When is the use of shielded electrical cable most critical?
• What does "electromagnetic interference" (EMI) affect in aircraft?
• What is the minimum bend radius for an electrical wire bundle?
• What is a common consequence of a short circuit in an aircraft electrical system?
• One advantage of using AC electrical power in aircraft is that it allows for...
• What is the typical operating voltage of a 28V DC aircraft electrical system?
• Which statements are true regarding the types of DC motors?
• What is a primary role of a voltage regulator in an aircraft electrical system?
• The nominal rating of electrical switches relates to which rating?
• What type of circuit is typically used for testing high resistance?
• Which type of electrical installations might benefit from open wiring?
• What does a growler test primarily check for in electric motors?
• What is the primary purpose of a transformer in an electrical circuit?
• The terminals used for most aircraft applications are primarily designed to do what?
• What is a major advantage of alternating current (AC) over direct current (DC)?
• What is the purpose of using a transformer in an AC electrical system?
• Which type of motor is most likely to have an armature brake?
• Which of the following factors is not considered when selecting electric cable size?
• What device is primarily used to protect electrical circuits from overheating?
• What type of protection does conduit provide for wires and cables in aircraft installations?
• What is the result of having low spring tension in motor brushes?
• What does the term "ground fault" imply in an electrical circuit?
• How is aircraft fuse capacity rated?
• How is the output voltage of an inductor-type inverter controlled?
• Which component is used to convert AC to DC power in aircraft?
• Which requirement must be met when installing an anticollision light?
• In aircraft, what does the use of fuses help to prevent?
• When selecting a terminal for an electric cable, which statement is true about strength requirements?
• What material are aircraft electrical junction boxes typically constructed from in a fire zone?
• What are the primary criteria for selecting the size of electric cable in an aircraft?
• What is one of the main benefits of using a two-wire electrical system?
• Which type of battery is most commonly used in modern aircraft?
• Which of the following components is typically used to provide electrical resistance in a circuit?
• What does the commutator of a generator do?
• What instrument measures the amperage in a circuit?