Embraer 190 - Electrical

36 Questions | By Embraer190 | Last updated: Mar 22, 2022 | Total Attempts: 2796

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ELECTRICAL QUESTIONS MADE FROM THE AOM VOL. 2GOOD LUCK! SANTIAGO STOCKER.

Questions and Answers

1.

Both IDGs and the APU generator are rated at _______________________ , three-phase.
- A.
  
  40 kVA, 220 VAC, 400 Hz
- B.
  
  40 kVA, 115 VAC, 400 Hz
2.

In flight, the _____ is used as an emergency generator, supplying power to the ESS BUSES when both AC BUSES 1 and 2 are not powered.
- A.
  
  RAT
- B.
  
  BATTERY #1
3.

What does "IDG" means?
4.

For automatic operation of the electrical system, the IDG selector knob must be set to the AUTO position. Moving the selector knob to OFF position, the generator line contactor opens, tripping off-line and de-exciting the selected IDG.
- A.
  
  True
- B.
  
  False
5.

Manual disconnection is achieved by selecting the respective knob to the _______ position. The flight crew cannot reconnect the IDG.
- A.
  
  DISC
- B.
  
  AUTO
6.

During the APU starting cycle, ________ is isolated from the network, powering the APU START BUS exclusively. In flight, the APU can be started up within operational limits, and replaces any IDG sources with no operational degradation.
- A.
  
  BATT 1
- B.
  
  BATT 2
7.

Before disconnecting the AC GPU from the airplane, the flight crew must push out the _________________ pushbutton, even if the IN USE light has already extinguished. The AC GPU pushbutton has to be pushed out for the next connection.
- A.
  
  AC APU
- B.
  
  AC GPU
8.

Ground staff can connect the GPU directly to the ____________________________ for ground maintenance and flight preparation, by pushing the respective button located on the front ramp panel or on the flight attendant panel at the forward right galley.
- A.
  
  AC/DC GND SVC BUSES
- B.
  
  DC GND SVC BUS
9.

The AC/DC inverter converts 28 V DC power from batteries to 115 V AC power to supply the _________________ when an AC power source is not available.
- A.
  
  STANDBY AC BUS
- B.
  
  ESS DC BUS
10.

The RAT is an AC electrical device installed in the airplane nose section, which converts the kinetic energy of airflow across the turbine into _________ . The electrical power produced is rated at 15 kVA, 115 V AC, 400 Hz, three-phase.
- A.
  
  AC power
- B.
  
  DC power
11.

Whenever AC power sources are not powering AC buses, the RAT is automatically deployed, and after 8 s, supplies power to the __________ .
- A.
  
  AC ESS BUS
- B.
  
  DC ESS BUS
12.

(ON RAT POWER) ____________________ are powered through the ESS TRU.
- A.
  
  DC ESS BUS3
- B.
  
  DC ESS BUSES
13.

To avoid total loss of power during this 8 s period, batteries are used as backup to power the DC ESS BUSES and the __________________ .
- A.
  
  AC ESS BUS.
- B.
  
  STANDBY AC BUS.
14.

The RAT electrical power drives the _________________________ for primary flight control tasks. These include high lift system actuation and power for essential avionics, communication and battery recharging.
- A.
  
  AC Motor-driven Pump (ACMP 3A)
- B.
  
  AC Motor-driven Pump (ACMP 3B)
15.

In flight, __________ altitude restriction for RAT deployment.
- A.
  
  There is
- B.
  
  There is no
16.

______ kt is required to ensure the RAT continues supplying AC/DC ESS BUSES. At speeds below this, the RAT may only supply the AC ESS BUS, and the batteries will automatically provide electrical power to the DC ESS BUSES and the STANDBY AC BUS through an AC/DC inverter.
17.

The DC electrical system comprises: • (1) ______ transformer rectifier units (TRU)s; • (2) ______ batteries.
- A.
  
  (1)Three / (2)Two
- B.
  
  (1)Two / (2) One
18.

On ground, a DC ground power unit (DC GPU) can be connected to the airplane supplying power to only the _______________________ .
- A.
  
  DC ESS BUS3
- B.
  
  APU START BUS
19.

In certain conditions, _____________________________ to backup all DC ESS BUSES and the AC STBY BUS. Battery #2 also supplies the APU START BUS, during APU starting.
- A.
  
  Batterie #1 is used
- B.
  
  Batterie #2 is used
- C.
  
  Batteries #1 and #2 are used
20.

Three TRUs convert 115 VAC power into 28 VDC. Each TRU works in isolation. If one of them fails, the BUSES will automatically be powered by the remaining TRUs, as long as the DC BUS TIES toggle switch is selected to ______.
21.

TRU 1 provides DC power to:
- A.
  
  DC BUS 1, DC ESS BUS 1, DC GND SVC BUS, HOT BATT BUS 1 and battery #1 charging.
- B.
  
  DC BUS 2, DC ESS BUS 2, HOT BATT BUS 2 and battery #2 charging.
22.

TRU 2 provides DC power to:
- A.
  
  DC BUS 1, DC ESS BUS 1, DC GND SVC BUS, HOT BATT BUS 1 and battery #1 charging.
- B.
  
  DC BUS 2, DC ESS BUS 2, HOT BATT BUS 2 and battery #2 charging.
23.

TRU ESS provides DC power to:
- A.
  
  DC ESS BUS 3.
- B.
  
  DC ESS BUS 2.
24.

In an ELECTRICAL EMERGENCY, batteries are capable to supply airplane essential systems for at least _____________ , even if the RAT is failed.
- A.
  
  10 minutes
- B.
  
  30 minutes
25.

Whenever the battery temperature reaches _________________________ , the associated indication becomes red and the EICAS WARNING message BATT 1 (2) OVERTEMP is triggered.
- A.
  
  50°C for at least 5 seconds
- B.
  
  70°C for at least 2 seconds