Electronics
T2a
T2a
Set of flashcards Details
| Flashcards | 474 |
|---|---|
| Language | Deutsch |
| Category | Electronics |
| Level | Primary School |
| Created / Updated | 12.01.2015 / 21.01.2020 |
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Inductance depends on
number of coil turns, Area of coil
A lead-acid battery is checked for serviceability by:
Measuring the specific gravity of the electrolyte
The output of a single lead acid cell is: What is the voltage level (single cell) of a fully charged lead-acid battery:
2.1 volts 2.1V
When carrying out a battery condition check using the aeroplane's voltmeter...
a load should be applied to the battery in order to give a better indication of the condition.
When a battery is nearly discharged, the...
voltage and current decrease
In a battery, when is "thermal runaway" most likely to occur?
During the charging of the battery.
The electrolyte in a Nickel Cadmium battery is:
Potassium hydroxide
How often should a battery undergo a capacity check?
Every 3 months.
How long does emergency lighting last for?
30 minutes
What are the advantages of NICAD batteries compared to the lead-acid batteries?
A lead-acid battery with 12 cells connected in series has a no-load voltage of 2.1 volts per cell. If this battery furnishes 10 amperes to a load having a resistance of 2 ohms, how large is the internal resistance of the battery ?
0.52 ohms
Immediately after engine starting the battery ammeter of a Ni-cad battery equipped system shows a very high rate of charge. This requires:
no action as it is normal
With an almost discharged battery there will be:
a decrease of voltage with increase load
If two 12 volts, 10 amp/hour batteries are connected in parallel the resulting combination is:
12 volts, 20 AH.
A 10 cell NiCad battery has a nominal voltage of...
12 volts
Lorentz Force is equal to...
==> F=BIL
Die Lorentzkraft ist die Kraft, die eine bewegte Ladung in einem magnetischen oder elektrischen Feld erfährt. Sie ist nach dem niederländischen Mathematiker und Physiker Hendrik Antoon Lorentz benannt. In Magnetfeldern ist sie am größten, wenn die Bewegungsrichtung der Ladungen senkrecht zu den Feldlinien des Magnetfelds verläuft. Ist die Bewegungsrichtung der Ladungen parallel zu den Feldlinien, tritt keine Lorentzkraft auf. Die Lorentzkraft wirkt immer senkrecht zur Bewegungsrichtung der Ladungen und den Magnetfeldlinien. Ihre Wirkungsrichtung kann mit der 3-Finger-Regel bestimmt
Electro-mechanical brakes are fitted to actuators...
to prevent motor overrun when power is switched off
An actuator motor with a high starting torque would be...
series wound
The commutator of a DC generator converts...
AC to DC
If a conductor is placed in a magnetic field, and a current is then passed through the conductor, the conductor will...
Be caused to move
The primary source of electrical power in a light aircraft...
alternator
In a light aircraft electrical circuit the reverse current cut-out will open when...
Battery voltage exceeds generator voltage
The voltage regulator of a DC generator is connected in...
series with the shunt field coil => A field coil is an electromagnet used to generate a magnetic field in an electro-magnetic machine, typically a rotating electrical machine such as a motor or generator.
How is the direction of the current flow in the armature windings of a DC motor reversed as the armature turns?
By brushes and the commutator
Generator paralleling through busbars is done to assure that..
different consumers can be fed from different sources.
When a conductor cuts the flux of a magnetic field...
an electromotive force (EMF) is induced in the conductor.
In order that DC generators will achieve equal load sharing when operating in parallel, it is necessary to ensure that...
their voltages are almost equal
In a carbon pile voltage regulator, when the pile is compressed its resistance __________, and the current through the field coil___________
Decreases / Increases
A shunt wound DC generator is another way of describing a generator with a wound field winding...
Parallel
When two DC generators are operating in parallel, control of load sharing is achieved by...
an equalising circuit which, in conjunction with the voltage regulators, varies the field excitation current of the generators
The output voltage of DC generators used in aircraft is normally regulated by...
Controlling the current in the field windings.
To reverse the direction of rotation of a shunt-type (parallel field) DC electric motor, it is necessary to:
reverse the polarity of either the stator or the rotor
The output of a generator is controlled by...
varying the field strength
Regarding generators, what is the operating principle of a voltage regulator?
It varies the resistance of a circuit so that the output voltage is kept constant.
Which basic principle is fundamental for all electric motor operation?
Physical force is produced when two magnetic fields react with each other
What is a typical semiconductor part?
Transistor => Ein Transistor ist ein elektronisches Halbleiter-Bauelement zum Steuern meistens niedriger elektrischer Spannungen und Ströme. Er ist der weitaus wichtigste „aktive“ Bestandteil elektronischer Schaltungen,
When a conductor cuts the flux of a magnetic field:
an electromotive force (emf) is induced in the conductor
The purpose of static discharge wicks is to:
safely dissipate the static charge of the aircraft in flight
CSD?
Constant speed drive => only reset on the ground, after engine shut-down
A current limiter fuse (thermal) in a DC generation system is used to:
allow a short term overload before rupturing
