Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
105 Cards in this Set
- Front
- Back
|
Electricity is the ….. of …
that produces ... |
movement
electrons power |
|
|
Aircraft ground power facility are
…. @ … v …. Hz @ … phase ….. KVA DC @ … V |
AC / 115 - 200
400 / 3 90 - 140 28.5 |
|
|
Ampere is the unite of …
shows the … which is ……... |
electrical current
rate of flow No. of electrons flowing when V is applied |
|
|
Ammeter is connected in … to circuit and will show …..
|
series
output current (load) |
|
|
Ohm is the … to ….
|
opposition / current flow
|
|
|
Voltage is the unite of ….
|
Electrical force /Px
|
|
|
Voltage is a measure of (2)
|
EMF
Pd |
|
|
EMF is
…. from …. to produce ... |
Electrical Px
source electron flow |
|
|
Pd is
…. any ….. |
between
2 circuit point |
|
|
… is the unit of electrical power
|
Watts (W)
|
|
|
Wats = …
formula |
V x I
|
|
|
one HP equal … watt
|
746
|
|
|
Capacitance is the measure of
….. fo ….. stored ….. |
quantify
electrical charge in a capacitor |
|
|
a Capacitor stores electricity in form of ...
|
volts
|
|
|
Capacitance formula
|
C =ɛr ɛ0 A/d
ɛr = electric constant ɛ0 = dielectric constant |
|
|
q , C , V relationship is capacitance
|
C = q/V
|
|
|
Inductance is the measure of …. produced by ….
|
magnetic flux
electric current |
|
|
Inductance is the ability of a …
to ….. in a …. |
inductor
energy magnetic field |
|
|
Inductor generates ….. proportional to ….
|
opposing voltage
rate of change of current |
|
|
Electromagnetic Induction
is the production of …. across …. with a ….. |
voltage
conductor changing magnetic flux |
|
|
a Changing magnetic flux can be derived from (2 methods )
|
amplitude
or phase change of AC voltage / current |
|
|
RMS stands for ...
|
Rout Mean Square
|
|
|
RMS is a … of ….
has same ….. of a …. @ same …. |
value / AC power
heating effect DC current / value |
|
|
Voltage regulation
by a …. diode |
zener
|
|
|
P-N junction
… added to create a ….. and a …. |
impurities
+ve charge carrier ( holes) -ve charge carrier ( electrones ) |
|
|
Potentiometer
controls …. power : …. |
voltage
low |
|
|
Potentiometer
has always …. when …. |
current running
voltage applied |
|
|
Potentiometer
has … connections : ….. |
3
2 end to V. source 1 to wiper |
|
|
Rheostat
controls …. power : ... |
current
Hi |
|
|
Rheostat
has … connections : ….. |
2
in sereis |
|
|
Rheostat
has …. running @ off voltage |
no current
|
|
|
Ohm law
…. through a conductor is proportional to … and i-proportional to ... |
current
Pd Resistance |
|
|
series circuit has
… junction and …. path |
no
one electrical |
|
|
current @ series circuit is ….
voltage @ series circuit is ... |
constant
divided |
|
|
Parallel circuit has … that ...
|
2 or more paths
reunite by the end |
|
|
Current @ parallel circuit is …
Voltage @ parallel circuit is … |
shared
constant |
|
|
Power rating @ DC gen is in ...
|
KW
|
|
|
in a 12V DC gen the voltage is regulated to ….
|
14V DC
|
|
|
in a 24V DC gen the voltage is regulated to ….
|
28V DC
|
|
|
In DC generators
…. converts the induced AC to DC |
commutator
|
|
|
Series Wound Generator
….. in series with ... |
field winding
armature & load |
|
|
Shut Wound Generator
….. in parallel with ... |
field winding
armature & load |
|
|
Series Wound Generator
…. current is same as …. |
excitation
current to load |
|
|
Shut Wound Generator
the … supplies both the … and ... |
armature
load field |
|
|
Shut Wound Generator
… is independent of ... |
field current
load current |
|
|
Compound Wound Generator
provides …. @ all |
constant output voltage
loads |
|
|
alternator provides … (AC/DC)
|
AC
|
|
|
inverter provides … (AC/DC)
|
AC
|
|
|
AC generators are rated in ...
|
KVA
|
|
|
AC gen is more efficient that DC ten is that the AC main output are from ...
|
slip rings
|
|
|
freq / RPM / No. of pols relationship
|
RPM = 120 f / N
|
|
|
In an alternator ,
Frequency is proportional to ... |
RPM
& number of poles |
|
|
AC Generator has a rotating … and a static ...
|
magnetic field
armature |
|
|
Field excitation of AC generator is culled …. at which a … is fed to the field
|
flashing the field
DC current |
|
|
@ brushless AC generator ,
a …. is mounted on the …. |
rotating solid state rectifier
rotor |
|
|
@ brushless AC generator ,
… is fed to … coil and …. produced @ the ... |
DC / main field
AC / stator |
|
|
3 phase AC gives ...
|
115 - 200 v
400 Hz |
|
|
why 3 phase equipments last longer
|
>>smoother waveform
>>more efficient |
|
|
Constant frequency system requires ...
|
CSDU
|
|
|
Constant frequency system
advantage (2) |
load absorption
continuity of supply → life |
|
|
Paralleling system
requirements: |
Frequency / phase / voltage
must match |
|
|
CSDU is … driven , through ..
|
Engine hydraulic pump
→ hyd motor accessory GB |
|
|
CSDU oil supply
|
its own!!
|
|
|
CSDU Disco button disconnects ….
|
both
the drive unit & alternator |
|
|
IDG stands for ….
and it's ... |
integrated drive generator
CSD + Gen |
|
|
Type of AC system
Output frequency is not controlled : name …. |
frequency wild AC
|
|
|
Type of AC system
Output frequency is not controlled : usage ... |
heating elements
fuel pump |
|
|
Type of AC system
Output frequency is not controlled: constant freq can be derived from …. |
rotary inverter
|
|
|
RAT stands for ...
|
Ram Air Turbine
|
|
|
RAT drives a …. ant that in turn drives the …
supplies ... |
Hyd pump
generator AC / DC |
|
|
inverter converts … to...
|
DC to AC
|
|
|
Rotary inverter : a … that ...
|
constant speed DC motor
drives an alternator |
|
|
static inverter supplies …
|
400 Hz single phase constant freq
|
|
|
Transformation
varying …. @ ….. causes varying … @ …. causes varying … @ …. causes varying … @ …. |
current / primary winding
magnetic flux / core magnetic field / 2nd winding EMF / 2nd winding |
|
|
transformation formula
|
Vs / Vp =
Ns / Vp = Ip / Is |
|
|
Rectifier converts … to ...
|
AC to DC
|
|
|
Electrical Bus
is a …. allows for …. |
common distribution point
load shedding |
|
|
fast reduction of elec. equip. is called ...
|
load shedding
|
|
|
load shedding allows for … @ ...
|
safe operations
min electrical load |
|
|
Bus Tie Braker
… to …. operated @ ... |
Bust bars / generator bus
fault detection |
|
|
Circuit Braker is a …. that … @ ….
(princ of operation) |
bimetallic element
expands different rate |
|
|
A CB becomes …. circuit when overloaded
|
open
|
|
|
Norma CB
reset possibility? |
can be reset
if essential for operation |
|
|
…. CB can be held in @ emergencies .
|
Non trip free
|
|
|
….. CB can not be held in to close the circuit
|
Trip free
|
|
|
Reseting CBs only … and only ...
|
after cool down period
once only |
|
|
Fues is a piece of wire with ….
|
low melting point
|
|
|
A fuse blows about when ….
|
exceeding amperage rating
|
|
|
Fuse requirements
|
min 10% of each rating
at least 3 |
|
|
A fuse that sustains huge overload before rupturing
|
current limiter
|
|
|
Capacity of a battery is the …
in units of .. |
energy available
amp hours |
|
|
In a battery
…. used determines Voltage output |
materials
|
|
|
In a battery
…. used determines Current output |
plate size
|
|
|
In a primary cell,
the …. is gradually destroyed . |
active material
|
|
|
Safety cell
a type of …. battery with …electrolyte |
wet
gel |
|
|
Lead acid battery
electrolyte composition . |
30% sulphuric acid
70% distilled water |
|
|
Lead acid battery
charge level proportional to ... |
SG
(hydrometer) |
|
|
Ni-Cad batteris
voltage stability @ …. |
hi discharge rate
|
|
|
Ni-Cad batteris
problem ... |
thermal runaway
|
|
|
L.acid & N.cad batteries release … and .. gasses
|
Hydrogen
Oxygen |
|
|
battery spillage cleaning by ...
|
Bicarbonate of soda
(baking soda) |
|
|
Battery connection
series : Capacity …. voltage ... |
no change
increases |
|
|
Battery connection
parallel : Capacity …. voltage ... |
increases
no change |
|
|
Increased charge time is indication of ….
|
Thermal runaway
|
|
|
Boding keeps the aircraft at …
to reduce …. |
same potential
static build up |
