ASA (Airframe) Aircraft Electrical
Systems Questions and Answers 100%
Pass
What is the primary function of an aircraft battery?
✔✔The battery provides electrical power for starting the engine and operating essential systems
when the engine is not running.
What is the purpose of an alternator in an aircraft electrical system?
✔✔The alternator generates electrical power to recharge the battery and supply electrical
systems during engine operation.
What type of current is typically used in aircraft electrical systems?
✔✔Aircraft electrical systems primarily use direct current (DC).
What is the role of a voltage regulator in an aircraft electrical system?
✔✔The voltage regulator maintains a constant output voltage from the alternator or generator to
prevent overcharging the battery and damaging electrical components.
1
,What is the function of circuit breakers in an aircraft electrical system?
✔✔Circuit breakers protect electrical circuits by interrupting the flow of current in case of
overload or short circuit conditions.
What type of wiring is commonly used for aircraft electrical systems?
✔✔Aircraft electrical systems typically use stranded copper wire to provide flexibility and
reduce weight.
What is the purpose of a bus bar in an electrical system?
✔✔A bus bar distributes electrical power to various circuits and components from a single
source.
How can a pilot identify a malfunctioning alternator during flight?
✔✔The pilot can monitor the ammeter; if the reading indicates a discharge rather than a charge,
it may suggest an alternator failure.
What are the typical voltage levels used in small general aviation aircraft electrical systems?
✔✔Most small general aviation aircraft operate on a 14-volt or 28-volt electrical system.
2
,What is the purpose of the grounding system in an aircraft electrical system?
✔✔The grounding system provides a reference point for the electrical system and protects
against electrical surges and lightning strikes.
How are electrical connectors typically identified in aircraft systems?
✔✔Electrical connectors are identified using specific designations, including letters and numbers
that indicate the type and size of the connector.
What is the significance of color coding in aircraft electrical wiring?
✔✔Color coding helps identify the purpose of each wire, such as power, ground, or control,
making it easier to troubleshoot and maintain the system.
What happens to the electrical system when an aircraft engine is shut down?
✔✔When the engine is shut down, the alternator stops generating power, and the electrical
system relies on the battery until the engine is restarted.
What is a common cause of electrical failures in aircraft systems?
✔✔Loose or corroded connections are common causes of electrical failures, as they can increase
resistance and lead to overheating or complete circuit failure.
3
, What device is used to monitor the condition of an aircraft's battery?
✔✔A battery condition indicator or voltmeter is used to monitor the voltage level and health of
the aircraft battery.
What precautions should be taken when working on aircraft electrical systems?
✔✔Always ensure the electrical system is de-energized and properly grounded before
performing any maintenance or repairs.
What type of relay is commonly used in aircraft electrical systems?
✔✔Electromechanical relays are commonly used to switch circuits on and off, providing control
over various electrical components.
How does a pilot reset a circuit breaker during flight?
✔✔A pilot can reset a circuit breaker by pulling it out slightly and then pushing it back in,
provided it's safe to do so.
What safety feature is integrated into the aircraft electrical system to prevent fires?
4
Systems Questions and Answers 100%
Pass
What is the primary function of an aircraft battery?
✔✔The battery provides electrical power for starting the engine and operating essential systems
when the engine is not running.
What is the purpose of an alternator in an aircraft electrical system?
✔✔The alternator generates electrical power to recharge the battery and supply electrical
systems during engine operation.
What type of current is typically used in aircraft electrical systems?
✔✔Aircraft electrical systems primarily use direct current (DC).
What is the role of a voltage regulator in an aircraft electrical system?
✔✔The voltage regulator maintains a constant output voltage from the alternator or generator to
prevent overcharging the battery and damaging electrical components.
1
,What is the function of circuit breakers in an aircraft electrical system?
✔✔Circuit breakers protect electrical circuits by interrupting the flow of current in case of
overload or short circuit conditions.
What type of wiring is commonly used for aircraft electrical systems?
✔✔Aircraft electrical systems typically use stranded copper wire to provide flexibility and
reduce weight.
What is the purpose of a bus bar in an electrical system?
✔✔A bus bar distributes electrical power to various circuits and components from a single
source.
How can a pilot identify a malfunctioning alternator during flight?
✔✔The pilot can monitor the ammeter; if the reading indicates a discharge rather than a charge,
it may suggest an alternator failure.
What are the typical voltage levels used in small general aviation aircraft electrical systems?
✔✔Most small general aviation aircraft operate on a 14-volt or 28-volt electrical system.
2
,What is the purpose of the grounding system in an aircraft electrical system?
✔✔The grounding system provides a reference point for the electrical system and protects
against electrical surges and lightning strikes.
How are electrical connectors typically identified in aircraft systems?
✔✔Electrical connectors are identified using specific designations, including letters and numbers
that indicate the type and size of the connector.
What is the significance of color coding in aircraft electrical wiring?
✔✔Color coding helps identify the purpose of each wire, such as power, ground, or control,
making it easier to troubleshoot and maintain the system.
What happens to the electrical system when an aircraft engine is shut down?
✔✔When the engine is shut down, the alternator stops generating power, and the electrical
system relies on the battery until the engine is restarted.
What is a common cause of electrical failures in aircraft systems?
✔✔Loose or corroded connections are common causes of electrical failures, as they can increase
resistance and lead to overheating or complete circuit failure.
3
, What device is used to monitor the condition of an aircraft's battery?
✔✔A battery condition indicator or voltmeter is used to monitor the voltage level and health of
the aircraft battery.
What precautions should be taken when working on aircraft electrical systems?
✔✔Always ensure the electrical system is de-energized and properly grounded before
performing any maintenance or repairs.
What type of relay is commonly used in aircraft electrical systems?
✔✔Electromechanical relays are commonly used to switch circuits on and off, providing control
over various electrical components.
How does a pilot reset a circuit breaker during flight?
✔✔A pilot can reset a circuit breaker by pulling it out slightly and then pushing it back in,
provided it's safe to do so.
What safety feature is integrated into the aircraft electrical system to prevent fires?
4
