Airframe Electrical 2 Practice Test

These questions are part of the practice quiz. Start practicing

• What is the primary purpose of insulation in aircraft wiring?
• In an aircraft DC system, what is meant by 'load shedding,' and why is it used?
• The battery master switch affects electrical system readiness by
• Which statement best describes AC induction motors?
• What is the purpose of a growler test?
• Equalizer circuits will only work if the difference between the generators is less than:
• What is the function of a 'master caution' light in relation to electrical system faults?
• What are bonding straps and where are they installed?
• What is the primary purpose of an ammeter in an aircraft electrical system?
• Shielding helps minimize crosstalk by acting as
• Via what control mechanism is the avionics bus isolation switch commonly operated on modern aircraft?
• Which test instrument would you use to verify alternator output and why?
• How do you calculate the safe operating current for a wiring run?
• Shielded cables protect signals from interference by:
• Which statement about the commutator's role is correct?
• The equalizer circuit shares load among DC generators. This is most closely described as:
• When you detect chafed or damaged wiring, what is the proper sequence to address it?
• Do AC induction motors require brushes to operate?
• When the battery master switch is ON, which is true?
• The absence of which two components distinguishes AC induction motors?
• What is the function of the avionics bus isolation switch in a modern aircraft?
• What is the effect of voltage drop along wiring, and how is it mitigated in aircraft electrical design?
• Output of a DC generator is regulated by using a ______ ______ wired in ______ with the magnetic field.
• What is used in a solid state regulator to detect voltage?
• Which is a direct conclusion about AC induction motors?
• The master caution light serves to indicate:
• With the battery master switch OFF, the electrical system's ability to start engines is
• What is the purpose of nesting or chaining protective devices (fuse, circuit breaker) in an aircraft circuit?
• What is the primary role of a standby bus in an aircraft electrical system?
• What is voltage regulation in aircraft electrical systems and why is it critical?
• This is used to control the frequency on large commercial jets.
• Which statement best describes the primary purpose of shielded cables in avionics?
• Which describes when the battery master switch is used during startup?
• Shielded cables reduce wear from movement by providing
• Which statement best describes a brushless generator's reliability?
• Commutators are used to do this on ____________ generators:
• How does a generator regulator maintain system voltage in a DC aircraft electrical system?
• Which document is specifically the troubleshooting manual?
• In general, how does a voltage regulator control a generator's output?
• Which regulator is more prone to wear due to moving parts?
• What type of aircraft would use an inverter for essential AC loads?
• What is the purpose of a bus tie switch or bus tie relay in an aircraft electrical system?
• Which devices are used to control the generator frequency on large jets?
• What is one method to locate an open circuit using a wiring diagram?
• AC induction motors are typically described as:
• Why would an aircraft have multiple power sources, and how do they interact?
• When is a troubleshooting flowchart most appropriately used in electrical system maintenance?
• To reverse a DC motor safely, you should
• Which arrangement is used to obtain direct current output from a generator?
• After oil overtemperature, must the CSD be reset on the ground before reconnecting?
• What does intermittent duty mean for high torque motors?
• What does continuity testing assess, and what is an acceptable result for a wiring harness?
• Describe the typical starting and charging sequence in a 28V DC aircraft electrical system.
• Which battery type is used on some modern aircraft designs?
• Which components are absent in AC induction motors?
• What are inverters used for?
• Do AC induction motors have brushes?
• What is the purpose of a commutator on a generator?
• When testing a power system that may have multiple sources, which sequence is recommended?
• Which control is used to disconnect the CSD?
• One major drawback of the vibrating points regulator?
• What produces field current in an AC generator?
• What is the role of protection devices in an interconnected aircraft power system?
• During startup, what is the primary purpose of load shedding?
• What is the typical effect of a short circuit in a DC aircraft electrical system?
• What is the role of the alternator field circuit?
• If a CSD was disconnected due to oil over temp, can it be reconnected in flight once oil returns to normal?
• How would you determine the correct fuse rating for a new accessory wire?
• During engine start, what is load management and why is it essential?
• Which component is used to convert three-phase AC from a generator into DC?
• What is the expected color coding for positive and negative conductors in a typical 28V DC aircraft system?
• How does a fuse differ from a circuit breaker in aircraft wiring?
• In the event of a short circuit, which protective device action is most likely to occur to protect wiring?
• What would you need for troubleshooting electrical problems in a system? (reference type)
• In a diode OR-ing arrangement, what is the outcome when multiple sources are involved?
• What tool is used to verify continuity and resistance in aircraft wiring, and what reading indicates good continuity?
• Explain the difference between direct current (DC) and alternating current (AC) in aircraft electrical systems and where each is typically used.
• Which statement about the shunt-type ammeter is correct?
• Why is bonding to the airframe important, and what could happen if bonding is inadequate?
• What is the primary function of the field frame in a DC motor?
• High torque motors are of this duty type.
• Which of the following statements about shielded cables is correct?
• In the transformer example, what is the secondary current if the primary current is 1 A and the input is 28 V with 400 primary turns and 100 secondary turns?
• Voltage fluctuations are sensed by this in the carbon pile regulator.
• In a carbon pile regulator, how are voltage fluctuations sensed?
• In a DC motor, which component reverses current in the windings to produce rotation?
• Which statement best describes the voltage regulator's role in a generator?
• Which statement is true about AC induction motors?
• When repairing damaged wiring, which parts should be used?
• In a carbon pile regulator, the series rheostat with the voltage coil adjusts what?
• The battery master switch function is
• How is a failed alternator detected and indicated to the pilot?
• In designing wiring for voltage drop mitigation, which practice is employed?
• In a multi-source electrical system, what happens to non-highest sources during a fault?
• Which statement best describes the readiness impact of the battery master switch?
• What component senses voltage fluctuations in both vibrating points and carbon pile regulators?
• Which of the following statements is true about AC induction motors?
• What are the typical three-phase voltage and frequency values for large aircraft power systems?
• Which of the following statements aligns with the absence of brushes or armature in AC induction motors?
• What type of current is produced in the armature of a generator?
• What is the primary reason shielded cables are used in avionics wiring?
• Which options best describe factors that determine conductor size for a given circuit and the factors that affect its ampacity?
• In terms of construction, AC induction motors are described as?
• Name 3 types of DC generators.
• What two things determine the frequency of an aircraft generator?
• How do you adjust voltage in a vibrating points regulator?
• What is the primary purpose of the essential electrical bus in a 28-volt aircraft electrical system?
• How does a ground fault relate to an aircraft's electrical system, and what indication would you expect?
• What practice helps minimize interference when wiring an avionics bus?
• Which bus is designed to stay powered to support critical flight instruments during abnormal conditions?
• What is the typical system voltage in general aviation aircraft and the common battery type used?
• Proper routing of shielded cables reduces wear from movement by
• What is the primary function of the brushes in a DC motor?
• What is the primary source of power in large commercial aircraft?
• What is the purpose of the equalizer circuit in a generator system?
• In a distributed power architecture, which bus powers critical systems?
• Which type of motor is brushless by design?
• Slip rings are used on what type of generator?
• Coming-in speed is defined as which of the following?
• What is the basic operating principle of a shunt-type ammeter used in aircraft electrical systems?
• If an integrated drive generator oil filter shows metal contamination, how should you fix it?
• Which of the following lists the four main parts of a DC motor?
• What is the typical procedure for performing a continuity and resistance check on a connector?
• Why is the avionics bus often protected by circuit breakers and may be on a separate battery or power source?
• Where are bonding straps typically installed in an aircraft airframe?
• DC alternators are excited by what source?
• What is the function of the avionics bus, and how is it typically protected?
• What is the purpose of abrasion-resistant sleeving in wiring repairs?
• Which protective device is a one-time device that opens the circuit when overloaded and cannot be reset?
• When wiring an avionics bus, what measures help minimize interference with other systems?
• What does a rectifier do?
• Large commercial aircraft use this type of current as its primary form of power.
• What is the obvious distinction between AC and DC generators?
• Why is a diode OR-ing arrangement used when multiple power sources are present?
• What prevents a generator from becoming motorized?
• High torque DC motors have their ______ wired in ______ with input current.
• If the battery is weak, which symptoms might be observed during engine start?
• What is the advantage of solid state voltage regulators compared to vibrating points regulators?
• How does a regulator 'limit current' in a DC generator system?
• What can happen if generator startup surges are not managed?
• What is the advantage of using AC current to power large aircraft?
• How do you adjust voltage output on a carbon pile type regulator?
• What is a key design feature of AC induction motors described in the source?
• What is the primary advantage of a brushless alternator?
• In solid-state inverters used in aircraft electrical systems, what does the term 'static' indicate?
• What is the role of a commutator in generators?
• What is a current limiter used for?
• In troubleshooting electrical problems, a wiring diagram helps you to
• Turning the battery master switch OFF will
• Which practice supports EMI reduction when using shielded cables?
• What are the four main parts of a DC generator?
• What is an open circuit fault and how would you locate it using a wiring diagram?
• How does the aircraft's battery condition affect generator charging, and what symptom would you expect with a failing battery during start?
• Identify the primary color code or labeling convention for aircraft wiring and explain why correct color coding is critical.
• In a vibrating points regulator, how is voltage sensed?
• What is the function of a transformer-rectifier unit in some aircraft?
• When checking a suspected open circuit, what step should you perform before using a live test to avoid damage?
• Why is it important to manage electrical load on the generator during starting to avoid latent faults?
• How is three-phase AC from a DC alternator rectified to DC?
• What is an essential bus, and what types of equipment are typically connected to it?
• DC generators are _______ excited.
• What safety precautions must be observed when working on aircraft electrical systems?
• Do AC induction motors have an armature?
• Which component supplies the DC field current in an AC generator?
• In the event of primary source failure, which subsystem remains powered to maintain essential flight instrumentation?
• What is the purpose of an isolation diode in an aircraft electrical power system?
• Zener diode is used to
• What is a 'paralleled' or 'parallel-connected' generator/alternator system, and why is it used?
• What voltage level does a typical 28-volt DC aircraft electrical system aim to maintain, as controlled by the generator regulator?
• What is a typical consequence if a fuse rating is set too high relative to the wiring ampacity?
• What is unique about a brushless alternator?
• What is a flow chart used for?
• How is reversing a DC motor accomplished?
• Which statement best describes the rotor design attribute of AC induction motors?
• Why should fuse ratings be kept below the wiring's ampacity?
• Describe the general purpose of a motor.
• A transformer has 400 turns in the primary and 100 turns in the secondary. The input voltage is 28 volts, 1 amp. What is the output voltage?
• Name the two types of inverters common to aircraft.
• Where are the variable resistors wired in the DC generator field circuit to regulate output?
• What must be done to generator brushes when they are replaced?