M3 Flashcards
(141 cards)
1
Q
Armature is also called what?
A
Rotor
2
Q
Power source for the armature is provided by what?
A
Commutator
3
Q
It is made of several hard copper segments that are separated from each other
A
Commutator
4
Q
In brushless motors, a motor that has a high RPM but low torque controlled by the external electronic.
A
Inrunner
5
Q
A brushless motor that is low RPM but high torque
A
Outrunner
6
Q
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
A
Shunt series
7
Q
What part of the circuit is with the Thermocouple?
A
HOT JUNCTION
8
Q
In a Thermocouple, the end which is attached to the circuit is called?
A
Cold junction
9
Q
What is RMS?
A
Root Mean Square
10
Q
Formula for RMS Power
A
-RMS VOLTAGE MULTIPLY BY RMS CURRENT
11
Q
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?
A
1 is to 4
12
Q
Turns ratio between primary coil and secondary coil of transformer design to triple its input voltage
A
PRIMARY WILL HAVE 1/3 AS MANY TURNS AS A SECONDARY
13
Q
Frequency of an alternator dependent upon what?
A
RPM
14
Q
Generators are referred at the rated voltage?
A
Ampere
15
Q
How to rate the generators?
A
AMPERE DEGRATED VOLTAGE
16
Q
It is electrically charged atoms
A
Ions
17
Q
Static electricity is produced by what?
A
FRICTION & INFLUENCE
18
Q
It is a device to measure current and how to use it?
A
AMMETER (Break the line/Disconnect the line considering the polarity)
19
Q
Voltage generation method used to measure the EGT of an aircraft
A
By heat
20
Q
The relationship between the generators and frequency of the AC signal?
A
Directly proportional
21
Q
Type of batteries that the electrochemical process is irreversible?
A
Primary cell
22
Q
In semiconductor, the material used for the amount of electrons that must be assured
A
8 electrons
23
Q
The smallest charge existing in an electron & proton
A
Elementary charge
24
Q
This is characterized by a flow of charges in a certain direction
A
Electric current
25
It is a process of chemical effect in current in electrolysis that can be used for what?
Galvanizing
26
In charging batteries, where do electrical charged atoms (ions) flow?
GAS & FLUID/LIQUID
27
Electrical machines, like motor & generator, operate on?
MAGNETISM
28
Generators & motors are what type of machine?
ROTATING ELECTRICAL MACHINE
29
Principle of all generators
Induction of Motion
30
Why do we need to connect batteries in parallel?
TO INCREASE CAPACITY (of such as power, capacity, voltage, current)
31
Thermocouple consists of?
- 2 DIFFERENT METAL ALLOYS
32
It is a distance that electrical current travels in the cycle time.
Wavelength
33
It is a conducting liquid.
Electrolyte
34
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
35
It is a constant flow of charge carriers in one direction.
DC
36
Electrons move in a few meters per second.
Velocity
37
It is generated by a separation of charges.
Voltage
38
Electrons move in a few meters per second
Velocity
39
Lowest voltage that is hazardous to humans?
50 V AC ,120V DC
40
It is invisible and only its effect is perceptible.
Electricity
41
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
42
It has better mechanical resistance, has a longer life and is less sensitive to short circuits.
NICKEL CADMIUM BATTERY (NiCad or NiCd)
43
Unlike/dissimilar terminals of power sources are connected will create a?
SERIES CONNECTION
44
It is a particle that surrounds the center of an atom
Electrons
45
It is a generation of high voltages by friction but no current will flow.
Static electricity
46
Method/s to produce conductivity of semiconductors.
- by DOPING
- by HEAT (increase mobility of electrons)
- by LIGHT
47
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
48
It is a separation of electrons from a metal bonding through heating.
THERMIONIC EMISSION
49
What will happen if two different metals are immersed into an electrically conductive/conducting liquid?
VOLTAGE IS GENERATED
50
It is a voltage generation in which a crystal is deformed by using pressure.
PIEZOELECTRIC EFFECT
51
It consists of electrolyte and electrodes made of 2 different conductive materials.
GALVANIC CELL
52
Type of battery used in aircraft.
NICKEL CADMIUM BATTERY (NiCad)
53
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.
54
The current along the series circuit is constant, therefore?
the current carrying capacity must be the same.
55
What happens to the temperature of metal when heated?
INCREASES
56
It is an energy converter that converts electrical charge.
PHOTOCELL
57
EGT (Exhaust Gas Temperature) measurement is using the principle voltage generation. What do you call this principle?
ELECTRON THERMIONIC EMISSION
58
It converts mechanical energy into electrical energy.
GENERATOR
59
Flow of a charged carrier that changes its direction magnitude repeatedly in a period of time.
AC
60
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.
61
Peak value of a wave in an AC Voltage
AMPLITUDE
62
Type of signal/output produced by the generator.
AC
63
Voltage generation method used to measure EGT of an aircraft
VOLTAGE GENERATION BY HEAT or BY HEAT
64
It is the ability of a medium to conduct electric fields.
PERMITTIVITY
65
It is a process of decomposition when passing an electric current through a lithium
ELECTROLYSIS
66
It is the opposition of the flow of electrons
RESISTANCE
67
It is the pure substance made up of at least 2 different elements which have been joined together by a chemical reaction.
COMPOUND
68
This material has a molecular structure with high mobility on the (valence shell?).
CONDUCTOR
69
It is the intensity of current into the body in a given period of time
CHARGE
70
What is the symbol used in voltage?
- U (german voltage symbol)
- V (international voltage symbol)
71
Process of voltage generation that involves the movement of conductor and the influence of the magnetic field.
INDUCTION
72
It is identified as the reciprocal of resistance.
CONDUCTANCE
73
Type of battery that the electrochemical has a constant current and a variable voltage.
PRIMARY CELL
74
What type of current is allowable to flow in a liquid?
ION CURRENT TRUE OR FALSE:
75
Forces that moves the electron?
ELECTROMOTIVE FORCE
76
Considered most important three phase motors
ASYNCHRONOUS
77
Special transformer which allows measurement of AC without breaking the current carrying leads?
CURRENT TRANSFORMER
78
Monitors main generator output regulates exciter field current
GENERATOR CONTROL UNIT
79
Losses of transformer is either?
COPPER LOSSES(SHORT CURCUIT) & IRON LOSSES(OPEN CURCUIT)
80
Motor high output brushless alternators eliminates problems that employ the slipring and brushless?
PERMANENT MAGNET GENERATOR
81
Current in rotating magnet?
EXCITER CURRENT
82
Positively charged inside the nucleus?
PROTON
83
Splitting of a compound
Analysis
84
Composed of several molecules
Matter
85
Symbol for charge
Q
86
Symbol for current
I
87
symbol of Conductance
G
88
Unit of conductance
S
89
It provides visualizationof rapidly varying processes in electrical engineering, electronics and other sciences
OSCILLIOGRAPHS/OSCILLISCOPES
90
It is separation of electrons from a metal bonding
Electron emission
91
Temperature difference between the junction and the 2 free ends as well as on the combination of metals
THERMOELECTRIC VOLTAGE
92
It refers to the flow of current from the positive pole to the negative pole
CONVENTIONAL CURRENT FLOW
93
It refers to the flow of current from the negative pole to the positive pole
ELECTRON FLOW
94
Is used to measure the frequency or cycle per second of the voltage
Hertz
95
Rated voltage of a lead battery cell
2V
96
It is defined as the reciprocal of the cycle time T
Frequency
97
The smallest unit of substance
Molecules
98
What happens in current in a voltage step up transformer with the ratio of 1 is to 4
DECREASE CURRENT
99
It is a combination of DC generators and DC motors
STARTER GENERATOR
100
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
101
It consist of a stator with the excitation winding, the rotor with the armature winding and carbon brushes
SHUNT-WOUND DC MACHINES
102
It has a constant ratio of rotation speed and frequency
SYNCHRONOUS MACHINES
103
It can be connected as a Shunt-wound machines and use as DC generator
COMPOUND DC MACHINE
104
It is the lagging of motor
SLIP
105
It is the efficiency of transformers higher than on other transformers but production is more costly
TOROIDAL
106
Elements are composed of?
ONE SINGLE KIND OF ATOMS
107
Various orbits that the electron orbits?
SHELLS
108
Electrically charged atoms
IONS
109
Electrons CANNOT be expelled from the atom by?
CENTRIPETAL FORCE
110
Mass of electron
No mass
111
Chemicals that are mixed with pure water for it to conduct electricity is called?
ELECTROLYTE
112
What is applied to the lower layer of a photo cell?
BORON ATOMS
113
Photocells that are used in solar cells
SILICON PHOTO CELLS
114
Velocity of electrons
FEW MILLIMETERS PER SECOND
115
Voltage that increases and decreases linearly
TRIANGULAR VOLTAGE
116
A combination of a coil and a magnet
Inductor
117
The change of the magnetic field in vicinity of coils is the basic principle of?
Induction
118
Relationship between conductance and resistance
Reciprocal
119
Siemens is a unit used for?
Conductance
120
A device for reversing the direction of flow of electric current
COMMUTATOR
121
In a 3-phase systems, the 3 identical coils are attached to?
STATOR
122
Other term for free electrons
Valence electron
123
Splitting compound
Analysis
124
In static electricity, a spark will occure when
HIGH VOLTAGE, HIGH HUMIDITY
125
The force electrical charger have on each other
COULOMBS LAW
126
If the temperature on a metal increases, the proper motion of electron
INCREASES
127
If the junction of two different metals are heated, a voltage is generated at the two free ends. This voltage is called
THERMOELECTRIC VOLTAGE
128
How many pole pairs are there in a quadripolar device
2
129
When the rotational speed of generator increases, the frequency of a sinusoidal AC
INCREASES
130
Angle of the coils in a 3-phase system
120
131
The certain resistance in a plate or acid
INTERNAL RESISTANCE
132
A current defined as when the terminals of a battery is directly connect to each other high current flows
SHORT CIRCUIT CURRENT
133
One method of emitting electrons is by heating. This form is also referred as
THERMIONIC EMMISION
134
In aviation, these metals are used in thermocouples for measuring Exhaust Gas Temperature(EGT)
CHROMEL, ALUMEL
135
A layer in a photo cell which releases charge carriers when light hits it
DEPLETION LAYER
136
The process when the electrical continuity in gases or metal vapour produces light
GAS DISCHARGE
137
In a bulb. These external forces make some atoms to splitoff some electrons
HEAT, LIGHT, RADIOACTIVITY
138
T or F :
Voltage can be generated if the circuit is in series.
False
139
T or F :
Voltage can be generated with the presence of EMF.
False
140
T or F:
The amount of voltage that can be generated depends on separation of charges.
True
141
T or F :
In Parallel connection, it has a constant voltage and the current value is the sum of all individual current?
True
