Electrical

Question 1

The electrical system on this aircraft consists of a _____ V AC system and a _____ V DC system.

Answer 1

115, 28

Question 2

Which of the following is not a part of the DC system?

Answer 2

Transformer Rectifier Units (TRUs),
2 22.8 V DC 27A NiCad batteries,
a DC external power unit

• • NOT APU GENERATOR, ENGINE DRIVEN IDG, OR INVERTER - -

Question 3

Which of the following is not a part of the AC system?

Answer 3

2 Engine Driven Integrated Drive Generators (IDGs),
an APU generator,
an INVERTER,
a Ram Air Turbine (RAT),
and AC external power unit

• • NOT BATTERIES, TRU’s, OR DC EXTERNAL POWER RECEPTACLE - -

Question 4

True or False: Four (4) Integrated Control Centers and two (2) Secondary Power Distribution Assemblies provide control and power distribution of electrical power.

Answer 4

True

Question 5

True or False: The output of the APU-driven generator is more power than output by the IDGs.

Answer 5

False

Question 6

True or False: The APU-driven generator can be used on the ground and in flight.

Answer 6

True

Question 7

True or False: Once the APU is started and the generator comes on line, external power must be manually deselected before the APU generator can power all AC buses.

Answer 7

False
[happens automatically]

Question 8

True or False: When the APU generator and AC external power is available, both will supply power to the aircraft at the same time.

Answer 8

False

Question 9

True or False: When the aircraft is parked, AC external power can supply power to the entire electrical system.

Answer 9

True

Question 10

After AC power has been restored following a total AC power loss in flight, when will the RAT retract?

Answer 10

It cannot be stowed in flight, even if normal electrical power is re-established. (5.12 Vol 2)

Question 11

How long does the RAT take to provide power to the AC and DC ESS BUSES after it has been deployed?

Answer 11

8 sec.

Question 12

True or False: In the event of a total loss of AC power, the Ram Air Turbine must be manually deployed.

Answer 12

False [it’s automatic]

If automatic deployment fails, then it can be manually deployed.

Question 13

If the aircraft slows to a speed below _______ kts., the RAT may only supply
power to the AC ESS BUS and the batteries power the DC ESS BUSES and
STANDBY AC BUS.

Answer 13

130 kts

Question 14

Inflight, what is the altitude restriction for RAT deployment?

Answer 14

In flight, there is no altitude restriction for RAT deployment.

Question 15

The static inverter converts _______ power to _______ power.

Answer 15

28 V DC (battery power from DC ESS BUSS 1),

115 V AC (AC STANDBY BUS - “A” IGNITERS)

Question 16

Which TRU normally provides power to the DC Ground Service Bus?

Answer 16

TRU 1

Question 17

What does TRU ESS provide power to?

Answer 17

DC ESS BUS 3

Question 18

Which of the following is displayed on the Electrical synoptic when a TRU has failed?

Answer 18

An amber X

Question 19

During an electrical emergency, when the RAT is not fully deployed or the stall speed is reached, the batteries are capable of supplying essential electrical loads for _______ minutes.

Answer 19

10 min.

Question 20

True or False: The aircraft is equipped with two SPDAs, located in the forward and aft EBAYS.

Answer 20

FALSE

[Forward and Center EBAYS]

Question 21

The aircraft is equipped with which of the following types of circuit breakers?

Answer 21

Thermal and electronic

Question 22

Which classification of circuit breakers are found in the flight deck?

Answer 22

Thermal only

Question 23

True or False: The SPDA’s contain electronic circuit breakers that are accessible from the MCDU.

Answer 23

True

Question 24

Sources of AC power include _______.

Answer 24

2 IDGs (Integrated Drive Generators),
APU Generator,
RAT (Ram Air Turbine),

and AC external power unit

(Also Inverter)

Question 25

True or False: Once disconnected, whether manually or automatically, an IDG cannot be reconnected in flight.

Answer 25

True

Question 26

The APU generator can perform which of the following?

Answer 26

Can power the entire electrical system by itself

Question 27

True or False: In the event of a loss of AC power, the Ram Air Turbine (RAT) must be manually deployed using the RAT MANUAL DEPLOY handle.

Answer 27

False

Question 28

Under normal operating conditions, DC power is provided by _______ Transformer Rectifier Units and _______ batteries.

Answer 28

3, 2

Question 29

True or False: TRU ESS provides AC power to DC ESS BUS 3.

Answer 29

False

Question 30

True or False: BATT 2 will also power the APU START BUS if needed.

Answer 30

True

Question 31

System logic provides electrical power for the aircraft according to which of the following source priorities?

Answer 31

RAGO: Respective IDG (onside) APU (Inside) GPU (Outside) Opposite IDG (offside)

Question 32

Which of the following is NOT on the AC Essential Bus?

Answer 32

AC fuel pump 2A ACMP 3A (hydraulic system pump) =pitch, roll, yaw SF-ACE 1 Flaps SF-ACE 2 Slats (5.32 Vol 2) - - NOT ALTERNATE LANDING GEAR EXTENSION MOTOR - -

Question 33

Which of the following is not a part of the DC system?

Answer 33

Transformer Rectifier Units (TRUs), 2 22.8 V DC 27A NiCad batteries, a DC external power unit - - NOT APU GENERATOR, ENGINE DRIVEN IDG, OR INVERTER - -

Question 34

Which of the following is not a part of the DC system?

Answer 34

Transformer Rectifier Units (TRUs), 2 22.8 V DC 27A NiCad batteries, a DC external power unit - - NOT APU GENERATOR, ENGINE DRIVEN IDG, OR INVERTER - -

Question 35

Which of the following is not a part of the AC system?

Answer 35

2 Engine Driven Integrated Drive Generators (IDGs), an APU generator, an inverter, a Ram Air Turbine (RAT), and AC external power unit - - NOT BATTERIES, TRU’s, OR DC EXTERNAL POWER RECEPTACLE - -

Question 36

Which of the following is not a part of the AC system?

Answer 36

2 Engine Driven Integrated Drive Generators (IDGs), an APU generator, an inverter, a Ram Air Turbine (RAT), and AC external power unit - - NOT BATTERIES, TRU’s, OR DC EXTERNAL POWER RECEPTACLE - -