Electrical

Question 1

How many NiCad batteries are there on the aircraft?

Answer 1

3

Question 2

How many engine-driven DC starter-generators are there on the aircraft?

Answer 2

2

Question 3

How many Transformer Rectifier Units (TRUs) are there on the aircraft?

Answer 3

2

Question 4

How many APU generators are there on the aircraft?

Answer 4

1

Question 5

True or False: The electrical system comprises both a direct current (DC) system and an alternating current (AC) system.

Answer 5

True

Question 6

True or False: DC power to the electrical system is supplied by two engine-driven DC generators only.

Answer 6

False

Question 7

True or False: Circuit breaker panels can be found in the left and right main landing gear wheel wells.

Answer 7

True

Question 8

How many circuit breaker panels are there in the flight compartment?

Answer 8

4

Question 9

Which of the following are NOT electrical buses?

Answer 9

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Question 10

The aircraft is equipped with which of the following batteries?

Answer 10

Main, Auxiliary, Standby

Question 11

How long will the batteries power the aircraft if normal electrical power fails?

Answer 11

60 minutes

Question 12

How many battery switches are there?

Answer 12

4

Question 13

. True or False: If the battery master is in the OFF position, the other batteries can still be used to power the aircraft.

Answer 13

False

Question 14

True or False: When the battery master is in the OFF position, all battery power is turned off no matter what position the other switches are in.

Answer 14

False

Question 15

If the battery is being charged at a 100% rate of charge, how will it be depicted on the MFD Battery page?

Answer 15

1.00

Question 16

How is negative discharge on a battery indicated on the MFD Battery page?

Answer 16

-.XX

Question 17

When the battery temperature is within limits, what color does it display as on the MFD Electrical page?

Answer 17

White

Question 18

When the battery temperature exceeds normal limits, what colors would display on the MFD Electrical page?

Answer 18

Yellow +50C to +65C,

Red Exceeds +65C

Question 19

If any battery temperature is 50 degrees C to 60 degrees C, what color does the battery temperature display as on the MFD Battery page?

Answer 19

Amber

Question 20

Where can the GPU be connected to the aircraft for DC power?

Answer 20

Left forward fuselage

Question 21

When connected to external power on the ground, what is displayed on the MFD Electrical page?

Answer 21

DC External Power On

Question 22

True or False: The EPCU protects the system from too high and too low DC power voltage form the external power source.

Answer 22

True

Question 23

After engine start, how many volts does the DC generator provide?

Answer 23

28V DC Power

Question 24

Where are the Transformer Rectifier Units (TRUs) located?

Answer 24

The nose compartment

Question 25

TRUs change 3-phase 115v AC to what?

Answer 25

28V DC Output

Question 26

During normal operation, which busses do the TRUs power?

Answer 26

Left or Right Secondary bus

Question 27

A L TRU caution light will illuminate when what happens?

Answer 27

The respective Left or Right TRU is off or has failed

Question 28

On the ground, what busses does the APU generator provide power for?

Answer 28

6 Buses

Question 29

What does it mean when a plus sign (+) is displayed in front of a value on the MFD Electrical page?

Answer 29

An overload of the power source

Question 30

The entire electrical system can still be powered when up to how many power sources have failed?

Answer 30

2

Question 31

When does the EPCU send a signal to the generator to trip it offline during a Main DC bus fault?

Answer 31

5 Seconds or more

Question 32

If the Right Main Bus has a bus fault, which battery is disconnected from the system?

Answer 32

Main battery

Question 33

True or False: If a Secondary bus fault occurs, the increased current will trip the circuit breaker for the respective TRU.

Answer 33

True

Question 34

In addition to an inoperative TRU, what is required for the EPCU to enter emergency mode?

Answer 34

Airplane in Air both DC Generators are not available

Question 35

In addition to a dual DC Generator failure, what is required for the EPCU to enter emergency mode?

Answer 35

Airborne at least 1 TRU is not available

Question 36

True or False: In emergency mode, the batteries are the main source of power.

Answer 36

True

Question 37

When in emergency mode, which busses automatically disconnect from the batteries?

Answer 37

Main Bus

Question 38

What is the voltage output of the AC generators?

Answer 38

115V

Question 39

Where are the AC generators mounted on the aircraft?

Answer 39

Propeller reduction gear box

Question 40

How many external AC power ports are there on the aircraft?

Answer 40

1 - INBD SIDE OF #2 NACEL

Question 41

When the aircraft is powered by external DC power, which busses are powered?

Answer 41

6 L/R Essential L/R Main L/R Secondary

Question 42

True or False: When a DC generator fails, the Main Bus Tie switch must be manually selected.

Answer 42

False

Question 43

Which switch would pilots use to connect the main battery to the associated feeder bus?

Answer 43

Main Battery Switch

Question 44

How many batteries is the aircraft equipped with?

Answer 44

3

Question 45

True or False: When a minus sign (-) is shown before a number on the MFD Electrical page, it means the battery is discharging.

Answer 45

True

Question 46

At what point will electrical bus load shedding begin?

Answer 46

If more than 2 DC Sources Fail

Question 47

In emergency mode, the _____ are the main energy source for the airplane.

Answer 47

Batteries

Question 48

The AC generators connect to the system when the engines are started, Gen 1 and 2 switches are selected ON, and _____.

Answer 48

Condition levers are in Min to Max range

Question 49

Which of the following statements regarding the AC cross tie function is most accurate?

Answer 49

Works automatically to ensure both AC buses are powered

Question 50

The DC electrical system is supplied by:

Answer 50

* (3) NiCad batteries (24v DC) * (2) Engine driven DC Starter-generators (28v DC) * (2) Transformer Rectifier Units (28v DC) * (1) Auxiliary Power Unit generator (28v DC).

Question 51

The AC electrical system is supplied by:

Answer 51

• (2) Engine driven AC generators that provide 115 volt, three phase, variable AC power.

Question 52

Selecting the Standby Battery switch to STBY BATT (ON) directly connects

Answer 52

the Standby battery to the left Main DC bus, allowing a “one-way” power flow for battery charging ONLY.

Question 53

Selecting the Auxiliary Battery switch to AUX BATT (ON) directly connects

Answer 53

the Auxiliary battery to the left Main DC bus allowing a two-way power flow

Question 54

Selecting the Main Battery switch to MAIN BATT (ON) directly connects

Answer 54

the Main battery to the right Main DC bus allowing a two-way power flow.

Question 55

Battery temperature values are displayed in WHITE

Answer 55

Normal Range

Question 56

Battery temperature values are displayed in AMBER

Answer 56

Battery temp between 50-65°C

Question 57

Battery temperature values are displayed in RED

Answer 57

BATT TEMP above 65°C

Question 58

A Left Main Bus fault is indicated by the illumination of these caution lights:

Answer 58

- DC Bus - Standby Battery - AUX Battery - #1 GEN Annunciator

Question 59

A Right Main Bus fault is indicated by the illumination of these caution lights:

Answer 59

- DC BUS - Main BATTERY - #2 GEN Annunciator

Question 60

Which batteries are used for engine starting when ground power is not available?

Answer 60

Main, Auxiliary

Question 61

True or False: If the battery master is in the OFF position, the other batteries can still be used to power the aircraft.

Answer 61

False

Question 62

True or False: When the battery master is in the OFF position, all battery power is turned off no matter what position the other switches are in.

Answer 62

True