M3 Flashcards
Armature is also called what?
Rotor
Power source for the armature is provided by what?
Commutator
It is made of several hard copper segments that are separated from each other
Commutator
In brushless motors, a motor that has a high RPM but low torque controlled by the external electronic.
Inrunner
A brushless motor that is low RPM but high torque
Outrunner
In DC machine, it is used when the starting port of the shut motor is too low and where the speed drop of the series wound motor is high
Shunt series
What part of the circuit is with the Thermocouple?
HOT JUNCTION
In a Thermocouple, the end which is attached to the circuit is called?
Cold junction
What is RMS?
Root Mean Square
Formula for RMS Power
-RMS VOLTAGE MULTIPLY BY RMS CURRENT
If current in a voltage step-up transformer with a Ratio of 1 is to 4, what is the ratio in a current step down?
1 is to 4
Turns ratio between primary coil and secondary coil of transformer design to triple its input voltage
PRIMARY WILL HAVE 1/3 AS MANY TURNS AS A SECONDARY
Frequency of an alternator dependent upon what?
RPM
Generators are referred at the rated voltage?
Ampere
How to rate the generators?
AMPERE DEGRATED VOLTAGE
It is electrically charged atoms
Ions
Static electricity is produced by what?
FRICTION & INFLUENCE
It is a device to measure current and how to use it?
AMMETER (Break the line/Disconnect the line considering the polarity)
Voltage generation method used to measure the EGT of an aircraft
By heat
The relationship between the generators and frequency of the AC signal?
Directly proportional
Type of batteries that the electrochemical process is irreversible?
Primary cell
In semiconductor, the material used for the amount of electrons that must be assured
8 electrons
The smallest charge existing in an electron & proton
Elementary charge
This is characterized by a flow of charges in a certain direction
Electric current
It is a process of chemical effect in current in electrolysis that can be used for what?
Galvanizing
In charging batteries, where do electrical charged atoms (ions) flow?
GAS & FLUID/LIQUID
Electrical machines, like motor & generator, operate on?
MAGNETISM
Generators & motors are what type of machine?
ROTATING ELECTRICAL MACHINE
Principle of all generators
Induction of Motion
Why do we need to connect batteries in parallel?
TO INCREASE CAPACITY (of such as power, capacity, voltage, current)
Thermocouple consists of?
- 2 DIFFERENT METAL ALLOYS
It is a distance that electrical current travels in the cycle time.
Wavelength
It is a conducting liquid.
Electrolyte
It is a type of signal in which the current varies in the polarity and quantity in the circuit over a period of time.
AC
It is a constant flow of charge carriers in one direction.
DC
Electrons move in a few meters per second.
Velocity
It is generated by a separation of charges.
Voltage
Electrons move in a few meters per second
Velocity
Lowest voltage that is hazardous to humans?
50 V AC ,120V DC
It is invisible and only its effect is perceptible.
Electricity
It is a junction between wire/s, power sources can reduce voltage available for the load as the current has to transfer from 1 device to another
CONTACT RESISTANCE
It has better mechanical resistance, has a longer life and is less sensitive to short circuits.
NICKEL CADMIUM BATTERY (NiCad or NiCd)
Unlike/dissimilar terminals of power sources are connected will create a?
SERIES CONNECTION
It is a particle that surrounds the center of an atom
Electrons
It is a generation of high voltages by friction but no current will flow.
Static electricity
Method/s to produce conductivity of semiconductors.
- by DOPING
- by HEAT (increase mobility of electrons)
- by LIGHT
It is a device/instrument to measure voltage, and how to use it?
VOLTMETER, connected in parallel with the Load and/or the Power Source
It is a separation of electrons from a metal bonding through heating.
THERMIONIC EMISSION
What will happen if two different metals are immersed into an electrically conductive/conducting liquid?
VOLTAGE IS GENERATED
It is a voltage generation in which a crystal is deformed by using pressure.
PIEZOELECTRIC EFFECT
It consists of electrolyte and electrodes made of 2 different conductive materials.
GALVANIC CELL
Type of battery used in aircraft.
NICKEL CADMIUM BATTERY (NiCad)
If 2 power sources are connected in parallel, what will happen to the voltage, current and resistance?
-TOTAL CURRENT is the sum of all individual current.
- TOTAL RESISTANCE is lower than the lowest individual resistance.
- TOTAL VOLTAGE is constant.
The current along the series circuit is constant, therefore?
the current carrying capacity must be the same.
What happens to the temperature of metal when heated?
INCREASES
It is an energy converter that converts electrical charge.
PHOTOCELL
EGT (Exhaust Gas Temperature) measurement is using the principle voltage generation. What do you call this principle?
ELECTRON THERMIONIC EMISSION
It converts mechanical energy into electrical energy.
GENERATOR
Flow of a charged carrier that changes its direction magnitude repeatedly in a period of time.
AC
What instrument to measure current and how to use it?
AMMETER, cut/disconnect the line/wire and connect the probes of the ammeter in series (on both ends cutted wire) considering the polarity of the ammeter.
Peak value of a wave in an AC Voltage
AMPLITUDE
Type of signal/output produced by the generator.
AC
Voltage generation method used to measure EGT of an aircraft
VOLTAGE GENERATION BY HEAT or BY HEAT
It is the ability of a medium to conduct electric fields.
PERMITTIVITY
It is a process of decomposition when passing an electric current through a lithium
ELECTROLYSIS
It is the opposition of the flow of electrons
RESISTANCE
It is the pure substance made up of at least 2 different elements which have been joined together by a chemical reaction.
COMPOUND
This material has a molecular structure with high mobility on the (valence shell?).
CONDUCTOR
It is the intensity of current into the body in a given period of time
CHARGE
What is the symbol used in voltage?
- U (german voltage symbol)
- V (international voltage symbol)
Process of voltage generation that involves the movement of conductor and the influence of the magnetic field.
INDUCTION
It is identified as the reciprocal of resistance.
CONDUCTANCE
Type of battery that the electrochemical has a constant current and a variable voltage.
PRIMARY CELL
What type of current is allowable to flow in a liquid?
ION CURRENT TRUE OR FALSE:
Forces that moves the electron?
ELECTROMOTIVE FORCE
Considered most important three phase motors
ASYNCHRONOUS
Special transformer which allows measurement of AC without breaking the current carrying leads?
CURRENT TRANSFORMER
Monitors main generator output regulates exciter field current
GENERATOR CONTROL UNIT
Losses of transformer is either?
COPPER LOSSES(SHORT CURCUIT) & IRON LOSSES(OPEN CURCUIT)
Motor high output brushless alternators eliminates problems that employ the slipring and brushless?
PERMANENT MAGNET GENERATOR
Current in rotating magnet?
EXCITER CURRENT
Positively charged inside the nucleus?
PROTON
Splitting of a compound
Analysis
Composed of several molecules
Matter
Symbol for charge
Q
Symbol for current
I
symbol of Conductance
G
Unit of conductance
S
It provides visualizationof rapidly varying processes in electrical engineering, electronics and other sciences
OSCILLIOGRAPHS/OSCILLISCOPES
It is separation of electrons from a metal bonding
Electron emission
Temperature difference between the junction and the 2 free ends as well as on the combination of metals
THERMOELECTRIC VOLTAGE
It refers to the flow of current from the positive pole to the negative pole
CONVENTIONAL CURRENT FLOW
It refers to the flow of current from the negative pole to the positive pole
ELECTRON FLOW
Is used to measure the frequency or cycle per second of the voltage
Hertz
Rated voltage of a lead battery cell
2V
It is defined as the reciprocal of the cycle time T
Frequency
The smallest unit of substance
Molecules
What happens in current in a voltage step up transformer with the ratio of 1 is to 4
DECREASE CURRENT
It is a combination of DC generators and DC motors
STARTER GENERATOR
It is a small series-wound motor which can be either operated by a DC or by a single phase current at a normal power frequency
UNIVERSAL MOTOR
It consist of a stator with the excitation winding, the rotor with the armature winding and carbon brushes
SHUNT-WOUND DC MACHINES
It has a constant ratio of rotation speed and frequency
SYNCHRONOUS MACHINES
It can be connected as a Shunt-wound machines and use as DC generator
COMPOUND DC MACHINE
It is the lagging of motor
SLIP
It is the efficiency of transformers higher than on other transformers but production is more costly
TOROIDAL
Elements are composed of?
ONE SINGLE KIND OF ATOMS
Various orbits that the electron orbits?
SHELLS
Electrically charged atoms
IONS
Electrons CANNOT be expelled from the atom by?
CENTRIPETAL FORCE
Mass of electron
No mass
Chemicals that are mixed with pure water for it to conduct electricity is called?
ELECTROLYTE
What is applied to the lower layer of a photo cell?
BORON ATOMS
Photocells that are used in solar cells
SILICON PHOTO CELLS
Velocity of electrons
FEW MILLIMETERS PER SECOND
Voltage that increases and decreases linearly
TRIANGULAR VOLTAGE
A combination of a coil and a magnet
Inductor
The change of the magnetic field in vicinity of coils is the basic principle of?
Induction
Relationship between conductance and resistance
Reciprocal
Siemens is a unit used for?
Conductance
A device for reversing the direction of flow of electric current
COMMUTATOR
In a 3-phase systems, the 3 identical coils are attached to?
STATOR
Other term for free electrons
Valence electron
Splitting compound
Analysis
In static electricity, a spark will occure when
HIGH VOLTAGE, HIGH HUMIDITY
The force electrical charger have on each other
COULOMBS LAW
If the temperature on a metal increases, the proper motion of electron
INCREASES
If the junction of two different metals are heated, a voltage is generated at the two free ends. This voltage is called
THERMOELECTRIC VOLTAGE
How many pole pairs are there in a quadripolar device
2
When the rotational speed of generator increases, the frequency of a sinusoidal AC
INCREASES
Angle of the coils in a 3-phase system
120
The certain resistance in a plate or acid
INTERNAL RESISTANCE
A current defined as when the terminals of a battery is directly connect to each other high current flows
SHORT CIRCUIT CURRENT
One method of emitting electrons is by heating. This form is also referred as
THERMIONIC EMMISION
In aviation, these metals are used in thermocouples for measuring Exhaust Gas Temperature(EGT)
CHROMEL, ALUMEL
A layer in a photo cell which releases charge carriers when light hits it
DEPLETION LAYER
The process when the electrical continuity in gases or metal vapour produces light
GAS DISCHARGE
In a bulb. These external forces make some atoms to splitoff some electrons
HEAT, LIGHT, RADIOACTIVITY
T or F :
Voltage can be generated if the circuit is in series.
False
T or F :
Voltage can be generated with the presence of EMF.
False
T or F:
The amount of voltage that can be generated depends on separation of charges.
True
T or F :
In Parallel connection, it has a constant voltage and the current value is the sum of all individual current?
True
