ERJ-145 Electrical Practice Test

These questions are part of the practice quiz. Start practicing

• Where are the batteries located?
• The backup battery provides power to which system?
• How do you re-energize the essential DC bus after a TRU failure?
• If the GPU is not connected, which condition energizes DC buses on the ground?
• The backup hot bus includes which components?
• Which components are part of the ERJ-145's electrical power generation and distribution system?
• What is the role of the aircraft battery in the ERJ-145 electrical system?
• The APU is electrically connected to which DC bus?
• In the inverter system, power is supplied from which source?
• What does the Electrical Distribution Logic (EDL) control?
• In the event of a loss of all generators, what powers the essential buses?
• What is the typical procedure for connecting external power on the ERJ-145?
• What is the maximum amperage of the auxiliary power unit generator above 30,000 ft?
• Which bus is supplied with power when the GPU is selected and the batteries are OFF?
• Will selecting OVRD on the SHED BUSES knob connect the shed buses?
• What is the purpose of Transformer Rectifier Units (TRUs) in the ERJ-145?
• If one TRU is offline, what happens to DC power on the DC buses with two TRUs installed?
• Which systems are powered by inverter power?
• What does the BUS TIES Selector Knob OVRD position do?
• Which power source is primarily used to initiate engine start on the ERJ-145?
• With four or five generators online, what is the electrical arrangement?
• In electrical emergency, which statement best describes battery endurance?
• During normal operation, Battery 1 is connected in parallel with which generators?
• Selecting the Essential Power Button ensures that which loads remain powered?
• If one power source is degraded, which bus remains powered to critical loads?
• Closing the Backup Battery Button enables charging of the backup battery. Which option matches this statement?
• In the event of a bus-tie fault, which option describes the correct sequence?
• What is the memory item for battery overtemperature?
• What are the backup battery specifications?
• After pressing the Essential Power Button, which loads remain powered?
• What is the purpose of the standby power system?
• What is the role of the standby power system?
• What is the function of the Avionics Master buttons on the overhead panel?
• What is the purpose of a standby battery on the ERJ-145?
• What three electrical sources can be used to start the APU?
• When do the generators come online?
• How do you recover from an 'Electrical Fault' in flight?
• Which of the following best describes the essential power button's effect on battery distribution?
• On the ground, when are all the DC buses energized?
• What is the purpose of the electrical loads management procedure?
• What is the function of TRUs when two are installed?
• How does the ERJ-145 monitor electrical health?
• What is the purpose of a standby inverter?
• Which statement is true about the number of generators on the aircraft?
• During APU start on the ground, what is the purpose of the Avionics Master buttons?
• What is the primary purpose of the ERJ-145 electrical power system?
• What does the AUTO position on the battery switches do?
• How does a TRU failure affect the DC distribution?
• In AUTO position, who controls battery contactor actuation?
• What is the role of the APU generator in electrical distribution?
• Which component failure would most directly affect the DC distribution by causing the DC bus it serves to lose power while the other bus remains powered if online?
• What happens to nonessential loads when a generator fails in flight?
• How many nickel-cadmium batteries are installed?
• Which statement correctly describes the behavior of the essential buses under total generator loss in flight?
• Can Battery #1 be used to start the APU?
• When a generator fails, what happens to nonessential loads and essential systems?
• Which phrase best captures the button's effect on auto transfer logic?
• What is the maximum amperage rating of the engine-driven generators?
• The essential DC bus powers which loads?
• When all three generators are online, how are the electrical networks configured?
• What happens to the battery if it becomes discharged while on the ground with external power connected?
• With one or two generators online, which statement describes the network connection?
• What is the difference between a main AC bus and an essential AC bus when one source is degraded?
• What is considered an electrical emergency?
• What would indicate a fault in the battery charging circuit?
• Which power sources energize the essential DC buses during a loss of AC power?
• How does the ERJ-145 prevent backfeeding between power sources?
• Can the ground power unit charge the aircraft batteries?
• How does the ERJ-145 restore AC power after a fault?
• Which statement accurately reflects the button's role in maintaining battery power?
• Which displays continue operating under emergency power?
• The inverter produces 115 VAC at what frequency?
• What happens to BTC1 if the #1 Generator fails without the APU running?
• What are the DC buses typically found on the ERJ-145 and what loads do they support?
• How might cockpit displays indicate a loss of AC power?
• When does the APU Line Contactor close?
• What happens to the battery contactors when the GPU is connected and selected ON?
• When the button is activated, which buses remain powered by the batteries?
• During an electrical emergency, how many minutes can the batteries supply essential power, including APU start attempts?
• Which indicators alert the crew to a generator failure?
• When would external power be used on the ground?
• With all 4 engine-driven generators online, what is the position of the bus tie contactors?
• When is the APU indication on the MFD electrical page removed?
• If the battery voltage does not rise during engine start or TRU operation, what fault is indicated?
• During AC power loss, what powers essential avionics after AC sources fail?
• What actions are recommended when you observe an electrical warning during approach?
• What kind of maintenance actions might be required after a generator fault?
• What is the role of Bus Tie Contactors when multiple generators are online?
• What action should you take if the automatic transfer fails with a loss of all generators?
• Will the SHED BUSES OVRD work in flight?
• What is the difference between the Main AC Bus and the Essential AC Bus on the ERJ-145?
• How is 28 V DC typically used in aircraft like the ERJ-145?
• What are typical warning signs of a DC bus fault?
• What is load shedding and why is it necessary?
• What type of batteries are used in the aircraft?
• Which combination would cause the APU indication to disappear from the MFD electrical page?
• What does the Essential Power Button do in the aircraft electrical system?
• How many generators are installed on the aircraft?
• What is the function of the DC-AC conversion system (TRUs) in normal operation?
• Which device converts external AC power to DC power for the aircraft's DC buses and battery charging?
• What happens to Battery 1 during APU start?
• If all engines' generators are unavailable, which sources can energize the essential buses?
• Activating the Essential Power Button most directly affects which of the following?
• What is the Electrical Distribution Logic (EDL)?
• Which of the following statements best describes the Essential Power Button's primary effect?
• Under SHED BUSES OVRD, what condition must be met for the feature to operate?
• How do you verify that external power is connected and delivering correct power on the ERJ-145?
• Explain the electrical configuration with 4 or 5 generators online.
• What does the Backup Battery Button do on the overhead panel?
• What should the GPU voltage indicate on the MFD when it is connected and available?
• What are the inverter specifications?
• What cockpit alert would indicate an electrical abnormality?
• Which bus supplies power to the inverter?
• Which indicators might be used to monitor DC health alongside EICAS in the ERJ-145?
• Which generators are driven from the right engine?
• Which item is powered from the Ground Service Bus?
• During an in-flight total loss of generators, which power source energizes the essential buses?
• Do the generators or the GPU have priority?
• In normal operation, what is the effect of the Essential Power Button on battery load?
• On the ground with the batteries as the only power source, do you have shed bus power?
• Which statement best describes the role of the essential AC bus?
• Why is 400 Hz used for aircraft electrical systems?
• How might cockpit displays indicate a loss of AC power?
• If the Essential Power Button is pressed, which of the following is true?
• Which maintenance activities help catch electrical faults before flight?
• How many reset attempts are allowed on a failed generator?
• What is the temperature threshold for the BATT OVTEMP warning?
• What should be checked on the electrical synoptic page during an electrical abnormality?
• What is the effect of engaging the Essential Power Button on the electrical emergency configuration?
• What are the battery specifications?
• What is the typical number and function of TRUs in the ERJ-145 electrical system?
• Which bus would power the listed cabin loads when the aircraft is on the ground and the GPU is active?
• The airplane's electrical system is predominantly what type of power?
• What would indicate a fault in the battery charging circuit?
• During normal operation, Battery 2 is connected in parallel with which generators?
• What voltage does the standby inverter provide to essential loads?
• What is the minimum battery temperature required to start the auxiliary power unit?
• How does the electrical system support engine start?
• What happens to BTC2 if the #1 Generator fails with the APU generator available?
• During APU start, which battery becomes isolated from the load buses?
• On the ground with engines off, which power source commonly supplies essential systems?
• When is external power used on the ground?
• What is the function of an external power receptacle on the ERJ-145?
• What is the role of TRUs in relation to AC and DC power?
• Which statement best describes how electrical health status is confirmed from the cockpit?
• Which scenario describes proper use of the Essential Power Button?
• How is DC power maintained during start if AC power is not yet available?
• If the airplane is exposed to cold temperature for an extended period, what should be done to the batteries?
• If a generator fails, can the ERJ-145 still power essential systems?
• Name the main sources of AC power on the ERJ-145.
• How do bus tie relays affect electrical distribution?
• To connect shed buses on the ground, which condition must be true?
• What light illuminates in the overhead panel GPU button when the GPU is connected and on?
• What does the SHED BUSES Selector Knob OVRD position do?
• How can you determine that automatic transfer has failed during a total loss of generators?
• How do you recover from a TRU fault while maintaining essential loads?
• Which bus remains energized during certain faults to support critical avionics?
• A battery must be removed from the aircraft for charging below what voltage?
• Where are the primary power sources connected to the electrical distribution system in an ERJ-145?
• After the engines are running, what powers the electrical buses?
• What is the maximum amperage of the auxiliary power unit generator up to 30,000 ft?
• If a battery's voltage after starting the APU is below 24V and the 30-minute recharge is performed, what power source should recharge the batteries?
• What is the role of an inverter in the ERJ-145 electrical system?
• How is continuity of power for flight instruments maintained during a loss of AC power?
• What is the function of circuit breakers in the aircraft electrical system?
• If the GPU is connected and selected ON, what is the status of the battery contactors?
• Which of the following statements is true about the SHED BUSES OVRD operation?
• What is the typical role of the APU generator in electrical distribution?
• Which of the following is NOT a listed APU start source?
• When 1 or 2 generators are online, what happens to the shed buses?
• Which of the following is NOT powered by the Ground Service Bus?
• What requirement is there on the ground in order to connect the shed buses?
• Which statement describes the altitude dependence of the APU generator amperage?
• Which action is performed by the Essential Power Button?
• What is a typical preflight check item related to the electrical system?
• What do we need to do if the battery voltage after starting the APU is below 24.0V?
• Which generators are driven from the left engine?
• In an electrical emergency, activating the button results in which outcome?
• Which battery starts the APU?
• A BATT 1 (2) OVTEMP Warning message occurs at what temperature?