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M11 new josh > 11.6 elec power > Flashcards

11.6 elec power Flashcards

(90 cards)

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1
Q

where is electrical heating used

A

galleys, anti ice, water, cockpit windows

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2
Q

what does the electrical power system consist of

A

generation, distribution

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3
Q

what are the electrical generation subsystems

A

AC/DC

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4
Q

what are the 3 different DC power sources on modern aircraft

A

DC battery, DC ext power, DC generators

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5
Q

what is an aircrafts battery used to supply

A

emergency power, APU starter motor power

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6
Q

what type of battery is the main battery

A

nickel cadmium type

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7
Q

what power does the main battery supply

A

24v DC

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8
Q

whats the EPU

A

external power unit

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9
Q

whats the power source during flight

A

engine driven generators

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10
Q

how many AC generators does each engine have

A

one or more

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11
Q

does the aircraft battery provide power in flight or ground

A

ground

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12
Q

batteries provide power by converting what

A

chemical energy into electrical

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13
Q

in an emergency how long will the battery supply power for

A

30 minutes

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14
Q

how are batteries vented

A

pipes

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15
Q

whats used to prevent reverse flow in the ventilation system on ground

A

non return valve

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16
Q

why is copper lockwire used to secure the battery connector

A

can quickly disconnect without wire cutters

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17
Q

what are the 2 types of aircraft main battery

A

Ni-Cd, lead-acid

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18
Q

during charging what is the individual cell voltage

A

1.5v

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19
Q

during discharge what is the individual cell voltage

A

1v

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20
Q

when are workshop checks carried out on batteries

A

2000 operating hours

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21
Q

what is one of the most major problems with batteries

A

thermal runaway

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22
Q

what are the 2 basic ways of charging batteries

A

constant voltage, constant current

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23
Q

what batteries is constant voltage charging method generally used on

A

lead-acid batteries

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24
Q

what type of batteries use the constant current charging method

A

Ni-Cd batteries

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25
in a battery test how long must a battery provide all necessary power for if failure occured
30 mins
26
in battery tests what capacity do batteries require
80%
27
what are the 2 different methods used to recharge NI-cd batteries
28v from DC VIA TRUs, separate battery charging unit
28
what do AC powered aircraft require to be installed
battery charging unit
29
why dont we usually charge batteries from ground power
can easily overcharge batteries
30
what does MFD stand for
multi function display
31
what battery parameters are shown on the cockpit display
voltage, current
32
when disconnecting a battery from an aircraft what lead do you disconnect first
negative lead
33
when installing a battery to an aircraft what lead do you install last
negative
34
list the advantages of lithium ion compared to Ni-Cd batteries
high voltage/current, improved power quality, recharge quickly, less weight, compact
35
what stages are lithium ion batteries charged in
constant current, balance, voltage source
36
lithium ion batteries have a fail safe feature that cuts the circuit out at what voltage
3-4.2v per cell
37
lithium ion cells cannot be charged safely below
0 degrees celcius
38
what are the 3 different sources of DC power
DC battery, external, DC generator
39
what type of battery is a DC battery
nickel cadmium
40
what voltage does a DC battery supply
24v DC
41
how many DC engine driven generators are there per engine
1
42
how are DC batteries cooled
duct air or internal fan
43
what are DC battery cores made from to prevent high altitude deformation
molybdenum disulphide
44
a DC supply needs to provide constant voltage in what 3 conditions
engine speed change, no loads/full loads, share loads with generators
45
what does the average DC starter generator weigh
10kg
46
what is the normal RPM range for DC batteries
7000 - 12000 RPM
47
what methods are used to attach AC and DC generators to engines
flange mounting, manacle ring
48
where is the generators direction on rotation shown
on ident plate
49
what is the purpose of a TRU
transfrom AC voltage to a DC voltage
50
what does a parallel system consist of
two or more generators connected to a common power bus
51
what does PPDS stand for
parallel power distribution system
52
what are all relays controlled by
GCUs
53
what are the advantages of parallel DC operation
TRUs loaded with average current, no DC bus lost when TRU fails
54
when is the main DC power isolated
when a TRU fails
55
what does the essential power distribution consist of
AC and DC part
56
how does the systems know when an engine has started
the engine RPM is higher than the starter motor can reach
57
what does airbus use for electronic controls in the cockpit
ECAM
58
what does boeing use for electronic controls in the cockpit
EICAS
59
on the elec sys control panel how many controls does each generator have
1 with an ON, OFF, RESET
60
what are the 3 sources for AC power
AC generators, static inverters, rotary inverters
61
what is the power of AC electrical power on aircrfat
400Hz 115/200 V
62
in a rotating field alternator the rotating magnetic field can be
permanent magnet, DC wound coils
63
in the rotating field alternator is there an electrical connection between the rotor and stator
no, only magnetic
64
what is voltage proportional to
speed
65
in AC power is rotational speed of the rotor increases what also increases
induced EMF
66
the frequency of the alternating output of a generator is directly proportional to what
rotational speed of rotor
67
how are AC generators output kept at a constant speed
by using a constant speed drive
68
in the internal oil circuit what is the oil used for
hydraulic fluid for motor pump, cooling, lubrication
69
in the external oil circuit what is the oil cooled by
oil cooler
70
what 2 ways is the CSD monitored in
by circuits, by indicators
71
what are the 2 CSD temp indicators
absolute oil temp, rise in temp
72
what is the only consequence of under speed AC CSD
stops generator delivering correct frequency
73
when disconnecting the CSD what do you check on the ECAM, EICAS displays
voltage and freq is 0
74
when must disconnect resets be carried out on the CSD
on the ground
75
why must the CSD be reset before engine starts
prevent damage to the IDG
76
to reset the CSD how long must the button be held from and how often
3 seconds held for and no more than once every 60 seconds
77
what does IDG stand for
integrated drive generator
78
what does the IDG do
create AC power
79
whats the frequency of aircrafts electrical supplies
400 Hz
80
what are the 2 basic types of inverters
rotary, static
81
what is a GCU
generator control unit
82
what are the 3 functions of the GCU
regulation, protection, switching
83
what does the GCU regulate
generator output
84
AC generation systems have what 3 basic forms
non-parallel, parallel, frequency wild
85
what form of AC generator system is the variable speed constant frequency
frequency wild generator
86
are non parallel or parallel systems more complicated
parallel more complicated
87
on DC powered aircraft where is AC power derived from
static inverters
88
what is a CT
current transformer
89
when cables pass through a current transformer, is there a physical connection between the cable and transformer
no
90

M11 new josh (23 decks)

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