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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