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EMB-120 > Electrical > Flashcards

Electrical Flashcards

1
Q

How many generators does the EMB 120 have?

A

Two Primary
Two Auxiliary
One APU

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2
Q

The emergency buses are normally connected to which generator?

A

the RIGHT main generator

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3
Q

AC electrical power is provided by?

A

Two static inverters.

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4
Q

The static inverters convert 28 VDC power into?

A

115 and 26 VAC.

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5
Q

In normal operation Inverter 1 powers __________, and Inverter 2 _______.

A

Inverter 1 powers the four main buses.

Inverter 2 is standby for the emergency bus.

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6
Q

How many batteries are installed on the EMB 120?

A

1) 24-VDC 36 amp hour NiCad MAIN battery.

2) 24-VDC 5 amp hour sealed lead acid BACKUP battery.

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7
Q

The battery has a protective device that?

A

Opens when the current from the central DC bus exceeds 500 amps.

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8
Q

The battery monitoring system incorporates _____ sensors in the compartment that?

A

2 Sensors. 1 for the gauge and 1 for the warning system.

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9
Q

The primary purpose of the backup battery is to?

A

power the standby artificial horizon.

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10
Q

The auxiliary generators are rated at?

A

28-VDC, 150 amp.

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11
Q

The auxiliary generators are driven by _________, and come online at _____.

A

Their respective propeller reduction gearbox and come online at 70% Np.

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12
Q

The main generators are rated at _______.

A

28-VDC 400 amp.

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13
Q

At ______ the GCU (generator control unit) opens the engine start contactor allowing the starter-generator to operate as a generator.

A

50% Nh (high pressure compressor speed)

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14
Q

An overvoltage relay protects the central DC bus if external power VOLTAGE exceeds ______.

A

32 VDC

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15
Q

Auxiliary generators are off below ______.

A

70% Np.

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16
Q

When the battery temp reaches ______ the alarms and warnings are triggered.

A

70c

17
Q

The backup battery is charged by?

A

emergency DC bus 2.

18
Q

The standby attitude indicator is powered by?

A

emergency DC bus 1.

19
Q

Each inverter produces ______ and ______ power.

A

115 VAC and 26 VAC 400 Hz power.

20
Q

Inverter 1 is powered from _________.

Inverter 2 is powered from _________.

A

Inverter 1 normal bus (DC Bus 2).

Inverter 2 emergency bus. (Emergency DC Bus 1).

21
Q

If you lose 115 VAC power from Inverter 1 what happens?

A

Automatically transfers to Inverter 2.

22
Q

If you lose 26 VAC power from Inverter 1 does it automatically transfer to Inverter 2?

A

NO—-QRH—-flip inverter 1 off—–then it will.

23
Q

Two modes of operation for the aircraft electrical system are?

A

Normal and Emergency.

24
Q

Under normal conditions, if both main generators fail while operating in normal mode?

A

The system will automatically switch to Emergency Mode.

25
Q

For the electrical system to switch to emergency mode automatically what conditions must be met?

A

1) at least one main generator switch ON.
2) PWR SELECT switch in BATT.
3) both main generators lost.

26
Q

What happens in autotransfer/emergency mode?

A

Normal buses get shut down and emergency buses are powered by the battery.

27
Q

In emergency mode with all generators lost the battery is automatically connected to the emergency DC buses and supplies power for approx?

A

30 minutes.

28
Q

Hot Battery Bus Items.

acc-dcd-main

A

autotransfer, clock, courtesy light, DC indication 1 and 2, digital clock, main door, T-handle fire items.

29
Q

To turn the AC system off?

A

Inverter 2 must be switched off before Inverter 1.

30
Q

The ‘Transfer Fail’ light will illuminate when?

A

In emergency mode when auxiliary generators have not transferred to the emergency DC buses and they are being powered by the battery only.

31
Q

The primary electrical power for the EMB 120 is?

A

28 VDC

32
Q

The backup battery is charged by?

A

Emergency DC bus 2

33
Q

In normal flight the auxiliary generators power?

A

DC Bus 3

34
Q

The number 1 inverter is powered by?

A

DC Bus 2

35
Q

During engine start, the starter/generator is powered from?

A

Central DC Bus.

36
Q

Inverter number 2 is powered from?

A

Emergency DC Bus 1.

37
Q

What does the GCU do?

name 3 of the 6

A

Generator Control Unit-

1) initiates start cycles
2) cancels start cycle at 50% RPM.
3) regulates generator output
4) overvoltage protection
5) overcurrent protection
6) reverse current protection

EMB-120 (12 decks)

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