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Area 3 > EE > Flashcards

EE Flashcards

1
Q

A property ascribed to phenomena, bodies or substances that can be quantified for, or assigned to a particular phenomenon, body, or substance.

A

Quantity

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2
Q

A quantity that can be used in the mathematical equations of science and technology

A

Physical Quantity

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3
Q

A particular physical quantity defined and adopted by convention, with which other particular quantities of the same kind are compared to express their value

A

Unit

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4
Q

The smallest portion into which an element can be subdivided without losing its physical and chemical properties

A

Atom

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5
Q

If an object contains more number of total electrons than the total protons

A

Negatively charged

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6
Q

If an atom contains of fewer number of electrons than the number of electrons

A

Positively charged

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7
Q

Amount of electrical charge on a single electron

A

Elementary Charge Unit (ECU)

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8
Q

Used to measure quantity of electric charge; approximately equal to 6.24 x 10^18 ECU

A

Coulomb (C)

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9
Q

The result of non-random movement of electrons

A

Current

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10
Q

Defined as the rate of electrical charge flow

A

Current (I)

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11
Q

Causes electric charge to flow in an electrical system having potential difference

A

Electromotive force and potential difference

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12
Q

The ability of a material to resist the flow of electrical charge when subjected to a given potential difference

A

Electrical Resistance

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13
Q

Property of materials to oppose the flow of electric current

A

Resistivity

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14
Q

Material which has low resistance to electron flow

A

Conductors

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15
Q

Material which has high resistance to electron flow

A

Insulators

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16
Q

Materials having an intermediate resistance to electron flow; usually used in construction of solid state electronic devices such as diodes and transistors.

A

Semi conductors

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17
Q

reciprocal of resistance, measured in mhos

A

conductance

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18
Q

ability of materials to conduct electricity

A

conductivity

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19
Q

a phenomenon when conductors lose their resistance in extreme cold

A

superconductivity

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20
Q

components are connected end-to-end in a line to form a single path for electrons to flow

A

series connection

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21
Q

all components share the same (equal) current

A

series connection

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22
Q

all components are connected between the same set of electrically common points

A

parallel connection

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23
Q

all components share the same (equal) voltage

A

parallel connection

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24
Q

measured in farad (F)

A

capacitance

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25
Q

the concept is closely related resistors connected in series

A

Voltage divider

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26
Q

the voltage across each resistors is _________ to the ratio of its resistance to the total series resistance of the circuit

A

directly proportional

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27
Q

the concept is closely related to resistors in parallel

A

current divider

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28
Q

the current divides in ______ to the resistances of the individual parallel elements

A

inverse proportion

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29
Q

it is always possible to view a very complicated circuit in terms of much simpler equivalent source and load circuits

A

Equivalent Circuits

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30
Q

from the point of view of the load, any network composed of ideal voltage and current sources, and of linear resistors, maybe presented by an equivalent circuit consisting of an ideal voltage source in series with an equivalent resistance

A

Thevenin’s Theorem

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31
Q

from the point of view of the load, any network composed of ideal voltage and current sources, and of linear resistors, maybe presented by an equivalent circuit consisting of an ideal current source in parallel with an equivalent resistance

A

Norton’s Theorem

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32
Q

States that the current flowing in a circuit varies directly with electrical pressure and inversely with opposition

A

Ohm’s Law

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33
Q

in kirchoff’s voltage law, the sum of the voltage around a closed path is equal to _______

A

zero

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34
Q

in a closed path, the sum of the voltage rise is equal to the voltage drop

A

kirchoff’s voltage law

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35
Q

because charge cannot be created but must be conserved, the sum of the currents entering a node is equal to the sum of the currents leaving the node

A

kirchoff’s current law

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36
Q

an instrument that gives a reading of the product of the current and the voltage in a circuit

A

wattmeter

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37
Q

the value of the power factor depends on the kin of opposition offered. It is never ______ than 1

A

greater

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38
Q

for heaters, incandescent lamps and electric ranges, power factor is ____ to 1

A

equal

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39
Q

for electric motors, power factor ranges between _____

A

0.6 to 0.8

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40
Q

it is power expended or used over a period of time

A

energy

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41
Q

common unit of electric power is_____

A

watt

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42
Q

common unit of electric energy consumption is ____

A

watt-hour

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43
Q

this type of meter is used for billing customers for electric usage

A

kilowatt-hour meter

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44
Q

characterized by non-variant current flow in one direction at all times

A

direct current (DC)

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45
Q

characterized by an alternating flow of current in two directions

A

alternating current (AC)

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46
Q

a plat of values of quantities which vary with time

A

waveform

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47
Q

signal that repeats the same shape at regular intervals of time

A

periodic waveform

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48
Q

the magnitude of a waveform at any instant of time

A

instantaneous value

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49
Q

the maximum instantaneous value of a function from zero-volt level

A

Peak Value

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50
Q

the sum of the magnitudes of the positive and negative peaks

A

peak-to-peak value

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51
Q

the time interval between successive repetitions of a periodic waveform

A

period

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52
Q

the portion of a waveform contained in one period of time

53
Q

the number of cycle that occur in one second

54
Q

the area under curve over a period of time

A

average value

55
Q

the effective value that would produce the same effect as an equivalent direct current

A

root-mean-square value

RMS value

56
Q

when voltage and current are in phase, all power is ____

57
Q

when circuit contains elements with other than pure resistance (capacitance or inductance), phase shift will occur between ____

A

voltage and current waves

58
Q

the property to oppose current change

A

inductance

59
Q

the amount of electric charge that a capacitor receives for each volt of applied potential

A

capacitance

60
Q

the angle between the pure resistance and the total impedance is_____

A

phase shift angle

61
Q

current in AC circuit with pure inductance will lag the voltage by ____

A

90 degrees

62
Q

in an AC circuit with pure capacitance loading the current will lead the voltage by____

A

90 degrees

63
Q

the optimum situation for transmission of power exists when the power factor of the load equals unit, that is , when the phase shift angle is _____

A

0 degree or zero

64
Q

the quantity of magnetic field force or push

A

magnetomotive force (mmf)

65
Q

also known as magnetic potential difference

A

magnetomotive force (mmf)

66
Q

quantity of total field effect or “substance” of the field

A

magnetic flux

67
Q

analogous to electric voltage (emf)

A

magnetomotive force (mmf)

68
Q

analogous to electric current

A

magnetic flux

69
Q

amount of field force (mmf) distributed over the length of the electromagnetic

A

Magnetic field strength

70
Q

amount of magnetic field flux concentrated in a given area

A

magnetic flux density

71
Q

opposition of magnetic field flux through a given volume of space or material

A

reluctance

72
Q

analogous to electrical resistance

A

reluctance

73
Q

specific measure of material’s acceptance of magnetic flux,

A

permeability

74
Q

describes that the electric field due to electric charges can be derived by coulomb’s law

A

Gauss’s Law for electricity

75
Q

states that the net magnetic flu through any (real or imaginary) closed surface is zero

A

Gauss’s Law for Magnetism

76
Q

describes the production of magnetic fields not only by electric currents but by changing electric field as well

A

Ampere’s Law

77
Q

describes the production of electric fields as a result of changing magnetic fields

A

Faraday’s Law of Induction

78
Q

voltage induced by changing magnetic flux

A

induced electric voltage

79
Q

current produced during electromagnetic flux

A

induced current

80
Q

factors which controls the magnitude of the induced votage

A

SLAS
S-strength of the magnetic field
L-length of the conductor within the field
A-angle at which the conductor passes through the field
S-speed at which the conductor passes through the field

81
Q

3 standard types of DC generators

A

SSC
S-shunt generator
S-series generator
C-compound generator

82
Q

3 general classes of synchronous generators

A

slow-speed-engine-driven type
moderate-speed-waterwheel-driven type
high-speed-turbine-driven type

83
Q

slow-speed-engine-driven type (rpm?)

84
Q

moderate-speed-waterwheel-driven type (rpm?)

A

80-900 rpm

85
Q

high-speed-turbine-driven type (rpm?)

A

720-3600 rpm

86
Q

Motor torque at zero speed or the maximum torque available to start the load

A

Locked-rotor torque

87
Q

Lowest value of torque produced by the motor between zero and full load

A

Pull-up Torque

88
Q

torque necessary to produce the motor’s rated horsepower at rated speed

A

full-load torque

89
Q

maximum torque a motor can carry without an abrupt drop in speed that may make the motor stall or inoperative

A

breakdown torque

90
Q

torque available for acceleration

A

acceleration torque

91
Q

refers to how frequently the motor is started and for how long it will run each time it is started

A

duty ratingi

92
Q

desirable for motors operating in clean air and water is kept away from entering the motor

A

open-type enclosure

93
Q

fins are constructed on the frame not affected by dusty condition and water splashes

A

closed-type enclosure

94
Q

desirable for motors operating in wet condition such as in pumping

A

drip-proof type enclosure

95
Q

indicates the maximum load that can be successfully carried by the motor if it is to operate continuously and remain a safe temperature range

A

service factor

96
Q

mechanical output can be measured either with _________

A

dynamometer or prony brake test

97
Q

electrical input can be measured by __________

A

voltmeter, ammeter, and wattmeter

98
Q

motors performs best at rated voltages, therefore wire must be sized to avoid voltage drop (allowable voltage drop is____

A

less than or equal to 2%

99
Q

branch circuit conductors to individual motors should be selected to carry _______ of full load current of the motor to allow for a certain degree of overload

100
Q

6 primary methods of producing electrical energy

A 
friction
pressure
heat
chemical reaction
light
magnetism
101
Q

a device that transfer energy from one electric circuit to another without change in frequency

A

Transformer

102
Q

the primary winding has more turns than the secondary

A

step-up transformer

103
Q

the primary winding has fewer turns than the secondary

A

step-down transformer

104
Q

electrical conductors which are 8 mm^2 (AWG NO. 8) or smaller in size

105
Q

larger than wires.

106
Q

the term given to an insulated stranded wire

107
Q

pipe that encloses and protects wire and cables

A

conduit (raceway)

108
Q

combined terms of ampere and capacity;

109
Q

expresses the current-carrying capacity of wire and cables

110
Q

provide access points for pulling and feeding conductors into a raceway system

A

Junction and pull boxes

111
Q

a unit area equal to that of a circle whose diameter is 1 mil (0.001)

A

circular mil

112
Q

typically plastic resins, soften and flow when they are heated and subjected to pressure , but they become rigid when cooled

A

thermoplastic

113
Q

initially set or cure when heated, but after curing they will soften, flow or distort

114
Q

insulation code R

115
Q

insulation code T

A

thermoplastic

116
Q

insulation code X

A

cross-linked polyethylene thermoset

117
Q

maximum temperature code H

A

75 degree Celcius

118
Q

maximum temperature code HH

A

90 Degree Celsius

119
Q

maximum temperature code nothing

A

60 degree celcius

120
Q

Designed to resist the flow of current

121
Q

Devices that increases potential difference for current flow

A

Voltage sources

122
Q

Devices that store energy in an electrostatic field

123
Q

Devices that store energy in a magnetic field

124
Q

Devices that acts as a one way switch. Allowing the current to flow in one direction only

125
Q

amplifies signals

A

Transistors

126
Q

In kirchoffs law, the algebraic sum of current at any node is equal to ____

127
Q

In kirchoffs law, the sum of currents entering is _____ to the sum leaving

128
Q

Materials that permits electrons to move freely are called _____

A

Conductors

Area 3 (7 decks)

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