Electronics
T2a
T2a
Fichier Détails
| Cartes-fiches | 474 |
|---|---|
| Langue | Deutsch |
| Catégorie | Electronique |
| Niveau | École primaire |
| Crée / Actualisé | 12.01.2015 / 21.01.2020 |
| Lien de web |
https://card2brain.ch/box/electronics_
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Which of the following parts is a typical semiconductor part?
Diode
A magnetic circuit breaker:
is a protection system that has a quick tripping response
In flight, if the Constant Speed Drive (CSD) temperature indicator is in teh red arc the:
pilot must disconnect it, and the generator is not available for the rest of flight
When the AC generators are connected in parallel, the reactive loads are balanced by means of the:
excitation (Anregung/Erregung/Reizung) current
The frequency of an AC generator is dependent on the:
number of pairs of poles and the speed of the moving part
When an open circuit occurs in an electrical supply system the:
loss of continuity will prevent its working components from functioning
The main purpose of a constant speed drive (CSD) unit is to:
maintain a constant frequency
When two DC generators are operating in parallel, control of load sharing is achieved by:
an equalissing circuit which, in conjunction with the voltage regulators, varies the field excitation current of the generators.
Lead shedding means:
temporary or permanent switching off of certain electric users to avoid overload of electric generators
The advantages of grounding the negative pole of the aircraft structure are:
a) weight saving b) easy fault detection c) reduction of short-circuit risk
When a persistent over.excitation limit fault excists on an AC generator connected to the aircraft mains with another AC generator, the over-excitation protection device opens:
the exciter breaker and the generator breaker
The advantages of alternating current on borad an aircraft are:
The output of a generator is controlled by:
varying the field strength
The voltage regulator of a DC generator is connected in:
series with the shunt field coil
If a current is passed through a conductor which is positioned perpendicular to a magnetic field:
a force will be exerted on the conductor
The phase relationship between two unparalleled AC generators
in unimportant
A tets to assess the state of charge of a Lead Acid battery would involve :
comparing the on-load and off load battery voltages
The rating of electrical fuses is expresses in
Amperes
Direct Curennt generator are connected
in parallel to provide max. power
When load sharing AC generators, real and reactive loads are adjust by controlling:
frequency and voltage
On detection of a persistent phase imbalance between an AC generator connected to the main busbares and other AC generators, the protection device that opens is /are the:
tie breakers
Because of the connection in parallel of electrical equipent on an AC busbar, isolation of individual equipments:
decrease the busbar current consumption.
Compound wound motor
Used when continuous running over a wide torque load range is required and comprises of both series and shunt fields where the best of their characteristics can be selected.
=> Used in contnuous running applications, have good starting torque and with a fairly constant speed => wounded in the same pole forces
Series-wound
to carry heavy current they are made up of a few turns of thick wire => starting on full load and has high starting torque and good acceleration => Speed varies inversely with the load and could overspeed leading to mechanical destruction => Engine start
Shunt -wound motors ?
the field windings are arranged in parallel with the motor armature. high resistance and consist of many turns of dine wire =>seed characteristics is constant and this type of motor is used where low torque is required but which increases with motor speed
Bild?
AND gate or ,,all or nothing "
Bild?
OR gate or any or all gate
Bild?
OR gate or any or all gate
Bild?
NAND gate
Bild?
NOR gate
Bild?
NOT gate (Invert gat)
CSD + GENerator ergeben ? Output?
IDG = Integrated Drive Generator ==> es gibt 400 Hz 3 Phasen AC Strom
Was ist die Weiterentwicklung des CSD?
VSCF => Variable Speed constant Frequency
Wo wird der Fluss unterbrochen, wenn man den Generator abstellt beim CSD?
Zwischen Generator(braucht kein Oil) und CSD ==> Drive disconnect = Quillshaft ==> Es wird einfach das Magnetische Feld unterbrochen
Wie wird die CSD unterbrochen?
Zwischen CSD und Gearbox, welche an der Turbine hängt. Durch ein Soloeid wird ein Pin herausgelassen, welcher verhindern, dass eine Feder einen Pin in den CSD hineinfährt, welcher dann die CSD von der Gearboc trennt
AC zu DC => Wer macht das und mit Voltage Angabe
AC BUS (115V) => TR (Tranformer) 28 V ==> DC BUS mit 28 V ==> TRU= Trandormer Rectifer Unit
DC zu AV Wer macht das und für was?
Inverter => Für Engine restart, wenn inflight engine failure
Was bedeutet 1 HZ und 400 HZ
1 HZ = 1 Seicle Pro Sekunde 400HZ = 400 Seicle pro Sekunde
Wie rechnet man HZ aus?
\(Hz (in sek) = {RPM * Pole Pairs \over 60}\)
RMS value?
quadratischen Mittelwert einer zeitlich veränderlichen physikalischen Größe ==> RMS value = Peak value * 0.707 (1/Wurzel2 = 0.707) => RMS value of voltage and current in AC gives the same power as the same value of voltage and current in DC
