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92 Cards in this Set
- Front
- Back
The law of (Blank) states, "Unlike magnetic poles attract, while like poles repel."
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Magnetic Force
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In a generator, when the armature completes the first 180 degrees of a turn, the conductor is no longer cutting this.
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Lines of Flux
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A power plant normally produces this many different phases.
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Three
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This measurement is equal to .637 of its maximum or peak value.
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Average Value
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In the "Left Hand Rule", this finger points in the direction of the lines of flux.
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Index
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The three components required to create electromagnetic induction are a: conductor, magnetic field and (Blank).
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Relative Motion
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The phase difference between two waveforms is measured in?
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Degrees
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This value is the total measurement from the positive peak to the negative peak of a sine wave.
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Peak to peak
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This is defined as the level of a signal in terms of voltage and current.
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Amplitude
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This is defined as the relative position of A/C quantities in time reference to each other.
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Phase
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A/C differs from D/C in Voltage and (Blank) Characteristics.
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Current
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A/C is an electrical current that changes in both (Blank) and direction.
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Magnitude
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The sine wave is a graphical representation of A/C over a period of (Blank).
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Time
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(Blank) is the time it takes to complete one sine wave.
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Period
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The number of complete cycles that occur in 1 second is called.
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Frequency
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A/C differs from D/C in Voltage and (Blank) Characteristics.
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Current
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A/C is an electrical current that changes in both (Blank) and direction.
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Magnitude
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The sine wave is a graphical representation of A/C over a period of (Blank).
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Time
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(Blank) is the time it takes to complete one sine wave.
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Period
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The number of complete cycles that occur in 1 second is called.
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Frequency
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Wavelength is normally expressed in what unit of measure?
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Meters
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As frequency increases the wavelength becomes
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Shorter
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Understanding wavelength is critical in designing this:
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Antennas
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A power supply classified as positive provides a single fixed output that has (Blank) potential.
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Positive
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What is the primary component used in the rectifier circuit?
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Diode
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A (Blank) is a group of circuits that convert A/C power to usable D/C voltage.
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Power Supply
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Average power in an A/C circuit can be calculated by multiplying the (Blank) current by the (Blank) voltage.
(one word) |
Effective
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Which circuit of a power supply isolates the A/C source voltage from the rest of the power supply?
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Input
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A power supply with a load that requires above the maximum rated current for the power supply is considered to be in a(n) (Blank) condition.
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Overload
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When adding all of the voltage drops of the resistors in a series A/C circuit the sum should equal (Blank) voltage.
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Applied
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A power supply that provides an output voltage the technician can control is classified as a (Blank) power supply.
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Variable
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What is defined as any device used to change electrical energy into a more useful form?
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Load
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When two or more resistors are in parallel, the smaller resistor will have more or less current then the other resistors?
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More
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When A/C is applied to a resistor, as voltage increases what happens to current?
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Current Increases
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What is constant in a purely resistive A/C Series circuit?
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Current
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The filter circuit converts (Blank) D/C into a smooth signal for use by the load.
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Pulsating
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What type of power supply will compensate for any changes to input voltage and load to maintain a constant output?
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Regulated
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What is constant in a purely resistive A/C parallel circuit?
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Voltage
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Capacitors, Inductors and resistors are often used together to create what type of filter?
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Filter Networks
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Which equates to a better filtering process, a larger or smaller value capacitor?
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Larger
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What type of filter is the most economical?
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Capacitive Resistive
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This type of filter is the least common in power supplies:
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Inductive resistive
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The part of the original A/C waveform that remains at the output of the filtered rectifier circuit is known as:
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Ripple
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The design of a filter depend on the requirements of the:
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Power Supply
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The inductive filter is most efficient when receiving its input from what kind of rectifier?
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Fullwave
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An inductor used in a filter is often called a:
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Choke
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When an RC pi type filter is connected to a significant load current, what component can replace the resistor to reduce A/C ripple even more?
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Inductor
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What term is used to explain the ability of a circuit or device to store an electrical charge?
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Capacitor
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A capacitor is made up of two metal plates separated by a:
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Dielectric
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The three factors that contribute to how much capacitance is present are: plate area, dielectric material and:
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Plate distance
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When power is first applied in a capacitive circuit, what is present, Maximum or minimum current?
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Maximum
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The stored electrical energy that sits on a capacitor's plate is known as:
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Electric field
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This is the maximum amount of voltage a capacitor can withstand across its plates:
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Breakdown voltage
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The measurement of a material's ability to establish and maintain an electric field is known as dielectric:
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Constant
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The small amount of current that a capacitor will conduct is known as:
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Capacitor Leakage
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How many time constants does it take for a capacitor to charge?
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Five
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The COMDTINST 10550.25B has the procedures for (Blank) a capacitor.
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Discharging
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What is the minimum amount of time a capacitor's terminals should be shorted?
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30 Seconds
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A component essentially made of two inductors placed side by side, so that when A/C is applied to the first inductor voltage will be induced onto the second inductor is known as a:
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Transformer
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The process of inducing voltage in one circuit by varying the current in another circuit is known as:
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Mutual Induction
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The three components that make up a transformer are: primary winding, secondary winding and:
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Core
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Which part of a transformer will always be attached to the source voltage.
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Primary winding
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Which part of a transformer will always be attached to the load:
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Secondary winding
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What do you compare to determine if a transformer will increase or decrease its output voltage?
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Turn Ratio
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When a transformer outputs the same voltage as the input, it is known as an:
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Isolation Transformer
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What is constant across all transformers?
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Power
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If power is constant and voltage can either be stepped up or stepped down on a transformer, this means that voltage and current are (Blank) proportional.
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Inversely
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What markings are placed on a transformer to indicate phase relationship?
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Phase dots
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What is placed on the secondary windings of a transformer so that two equal voltages are provided?
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Center Tap
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Eddy currents can be reduced by changing the solid core into a (Blank) core.
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Laminated
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This type of rectifier uses four diodes to develop a continuous pulsating D/C.
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Bridge Rectifier
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What term is used to describe a waveform with a positive or negative alternation with the other alternation removed?
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Pulsating D/C
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The input frequency and the output ripple frequency of a half wave rectifier have what type of phase relationship?
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In phase
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Which part of the diode represents the negative side?
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Cathode
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Which part of the diode represents the positive side?
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Anode
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When the diode blocks current from passing, it is considered to be:
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Reversed Biased
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What is the output of a half wave rectifier with the anode facing the transformer?
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Positive Pulsating D/C
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When the diode allows current to pass, it is considered to be:
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Forward Biased
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What are the three Classification of rectifiers?
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Half wave Full wave, and Bridge
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What is the key component of all rectifier circuits in a power supply?
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The Diode
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When comparing the input signal and the output signal of a full wave rectifier, the frequency of the pulsating D/C will be higher or lower the the input?
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Higher
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What is defined as the total opposition to current that is present in a circuit?
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Impedance
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When curent is first applied to an inductor in a D/C circuit, the inductor acts like an:
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Open
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If a high frequency is present on an inductor, what type a current would be observed?
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Minimum
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what is the unit of measure for an inductor?
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The Henry: H
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The amount of inductive reactance is dependent on inductance (or the size of the inductor) and:
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Frequency
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Once a inductor has fully energized in a D/C circuit, the inductor acts like a:
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Short
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The process by which a current carrying inductor induces CEMF into itself, due to the moving magnetic field of changing current is known as:
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Self-Inductance
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The steady opposition to A/C current flow offered in an inductor is known as:
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Inductive Reactance
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What is the unit of measure for inductive reactance?
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Ohms
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The rate at which current changes in a conductor is called a:
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Time Constant
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How many time constants does it take for an inductor to achieve maximum current flow?
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Five
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