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E175 > Electrical > Flashcards

Electrical Flashcards

1
Q

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

A

115, 28

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2
Q

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

A

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

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3
Q

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

A

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

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4
Q

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

A

True

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5
Q

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

A

False

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6
Q

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

A

True

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7
Q

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.

A

False [happens automatically]

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8
Q

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

A

False

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9
Q

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

A

True

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10
Q

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

A

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

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11
Q

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

A

8 sec.

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12
Q

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

A

False [it’s automatic]

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13
Q

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.

A

130 kts

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14
Q

Inflight, what is the altitude restriction for RAT deployment?

A

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

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15
Q

The static inverter converts _______ power to _______ power.

A

28 V DC, 115 V AC

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16
Q

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

A

TRU 1

17
Q

What does TRU ESS provide power to?

A

DC ESS BUS 3

18
Q

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

A

An amber X

19
Q

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.

A

10 min.

20
Q

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

A

FALSE [Forward and Center EBAYS]

21
Q

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

A

Thermal and electronic

22
Q

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

A

Thermal

23
Q

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

A

True

24
Q

Sources of AC power include _______.

A

2 IDGs (Integrated Drive Generators),
APU Generator,
RAT (Ram Air Turbine),
and AC external power unit

(Also Inverter)

25
Q

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

A

True

26
Q

The APU generator can perform which of the following?

A

Can power the entire electrical system by itself

27
Q

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.

A

False

28
Q

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

A

3, 2

29
Q

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

A

False

30
Q

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

A

True

31
Q

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

A

RAGO:

Respective IDG
APU (Inside)
GPU (Outside)
Opposite IDG

32
Q

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

A

AC fuel pump 2A

ACMP 9 (hydraulic system pump) 3A =pitch, roll, yaw

SF-ACE 1 Flap CH 1 AC Feed

SF-ACE 2 Slat CH 2 AC Feed

(5.32 Vol 2)

33
Q

Standby AC bus powers:

A

Engine 1 Exciter (Igniter) 1A
Engine 2 Exciter (Igniter) 2A

E175 (23 decks)

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