Uscg Et A-School Unit 2 A/c

Front 1

The law of (Blank) states, "Unlike magnetic poles attract, while like poles repel."

Back 1

Magnetic Force

Front 2

In a generator, when the armature completes the first 180 degrees of a turn, the conductor is no longer cutting this.

Back 2

Lines of Flux

Front 3

A power plant normally produces this many different phases.

Back 3

Three

Front 4

This measurement is equal to .637 of its maximum or peak value.

Back 4

Average Value

Front 5

In the "Left Hand Rule", this finger points in the direction of the lines of flux.

Back 5

Index

Front 6

The three components required to create electromagnetic induction are a: conductor, magnetic field and (Blank).

Back 6

Relative Motion

Front 7

The phase difference between two waveforms is measured in?

Back 7

Degrees

Front 8

This value is the total measurement from the positive peak to the negative peak of a sine wave.

Back 8

Peak to peak

Front 9

This is defined as the level of a signal in terms of voltage and current.

Back 9

Amplitude

Front 10

This is defined as the relative position of A/C quantities in time reference to each other.

Back 10

Phase

Front 11

A/C differs from D/C in Voltage and (Blank) Characteristics.

Back 11

Current

Front 12

A/C is an electrical current that changes in both (Blank) and direction.

Back 12

Magnitude

Front 13

The sine wave is a graphical representation of A/C over a period of (Blank).

Back 13

Time

Front 14

(Blank) is the time it takes to complete one sine wave.

Back 14

Period

Front 15

The number of complete cycles that occur in 1 second is called.

Back 15

Frequency

Front 16

A/C differs from D/C in Voltage and (Blank) Characteristics.

Back 16

Current

Front 17

A/C is an electrical current that changes in both (Blank) and direction.

Back 17

Magnitude

Front 18

The sine wave is a graphical representation of A/C over a period of (Blank).

Back 18

Time

Front 19

(Blank) is the time it takes to complete one sine wave.

Back 19

Period

Front 20

The number of complete cycles that occur in 1 second is called.

Back 20

Frequency

Front 21

Wavelength is normally expressed in what unit of measure?

Back 21

Meters

Front 22

As frequency increases the wavelength becomes

Back 22

Shorter

Front 23

Understanding wavelength is critical in designing this:

Back 23

Antennas

Front 24

A power supply classified as positive provides a single fixed output that has (Blank) potential.

Back 24

Positive

Front 25

What is the primary component used in the rectifier circuit?

Back 25

Diode

Front 26

A (Blank) is a group of circuits that convert A/C power to usable D/C voltage.

Back 26

Power Supply

Front 27

Average power in an A/C circuit can be calculated by multiplying the (Blank) current by the (Blank) voltage.
(one word)

Back 27

Effective

Front 28

Which circuit of a power supply isolates the A/C source voltage from the rest of the power supply?

Back 28

Input

Front 29

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.

Back 29

Overload

Front 30

When adding all of the voltage drops of the resistors in a series A/C circuit the sum should equal (Blank) voltage.

Back 30

Applied

Front 31

A power supply that provides an output voltage the technician can control is classified as a (Blank) power supply.

Back 31

Variable

Front 32

What is defined as any device used to change electrical energy into a more useful form?

Back 32

Load

Front 33

When two or more resistors are in parallel, the smaller resistor will have more or less current then the other resistors?

Back 33

More

Front 34

When A/C is applied to a resistor, as voltage increases what happens to current?

Back 34

Current Increases

Front 35

What is constant in a purely resistive A/C Series circuit?

Back 35

Current

Front 36

The filter circuit converts (Blank) D/C into a smooth signal for use by the load.

Back 36

Pulsating

Front 37

What type of power supply will compensate for any changes to input voltage and load to maintain a constant output?

Back 37

Regulated

Front 38

What is constant in a purely resistive A/C parallel circuit?

Back 38

Voltage

Front 39

Capacitors, Inductors and resistors are often used together to create what type of filter?

Back 39

Filter Networks

Front 40

Which equates to a better filtering process, a larger or smaller value capacitor?

Back 40

Larger

Front 41

What type of filter is the most economical?

Back 41

Capacitive Resistive

Front 42

This type of filter is the least common in power supplies:

Back 42

Inductive resistive

Front 43

The part of the original A/C waveform that remains at the output of the filtered rectifier circuit is known as:

Back 43

Ripple

Front 44

The design of a filter depend on the requirements of the:

Back 44

Power Supply

Front 45

The inductive filter is most efficient when receiving its input from what kind of rectifier?

Back 45

Fullwave

Front 46

An inductor used in a filter is often called a:

Back 46

Choke

Front 47

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?

Back 47

Inductor

Front 48

What term is used to explain the ability of a circuit or device to store an electrical charge?

Back 48

Capacitor

Front 49

A capacitor is made up of two metal plates separated by a:

Back 49

Dielectric

Front 50

The three factors that contribute to how much capacitance is present are: plate area, dielectric material and:

Back 50

Plate distance

Front 51

When power is first applied in a capacitive circuit, what is present, Maximum or minimum current?

Back 51

Maximum

Front 52

The stored electrical energy that sits on a capacitor's plate is known as:

Back 52

Electric field

Front 53

This is the maximum amount of voltage a capacitor can withstand across its plates:

Back 53

Breakdown voltage

Front 54

The measurement of a material's ability to establish and maintain an electric field is known as dielectric:

Back 54

Constant

Front 55

The small amount of current that a capacitor will conduct is known as:

Back 55

Capacitor Leakage

Front 56

How many time constants does it take for a capacitor to charge?

Back 56

Five

Front 57

The COMDTINST 10550.25B has the procedures for (Blank) a capacitor.

Back 57

Discharging

Front 58

What is the minimum amount of time a capacitor's terminals should be shorted?

Back 58

30 Seconds

Front 59

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:

Back 59

Transformer

Front 60

The process of inducing voltage in one circuit by varying the current in another circuit is known as:

Back 60

Mutual Induction

Front 61

The three components that make up a transformer are: primary winding, secondary winding and:

Back 61

Core

Front 62

Which part of a transformer will always be attached to the source voltage.

Back 62

Primary winding

Front 63

Which part of a transformer will always be attached to the load:

Back 63

Secondary winding

Front 64

What do you compare to determine if a transformer will increase or decrease its output voltage?

Back 64

Turn Ratio

Front 65

When a transformer outputs the same voltage as the input, it is known as an:

Back 65

Isolation Transformer

Front 66

What is constant across all transformers?

Back 66

Power

Front 67

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.

Back 67

Inversely

Front 68

What markings are placed on a transformer to indicate phase relationship?

Back 68

Phase dots

Front 69

What is placed on the secondary windings of a transformer so that two equal voltages are provided?

Back 69

Center Tap

Front 70

Eddy currents can be reduced by changing the solid core into a (Blank) core.

Back 70

Laminated

Front 71

This type of rectifier uses four diodes to develop a continuous pulsating D/C.

Back 71

Bridge Rectifier

Front 72

What term is used to describe a waveform with a positive or negative alternation with the other alternation removed?

Back 72

Pulsating D/C

Front 73

The input frequency and the output ripple frequency of a half wave rectifier have what type of phase relationship?

Back 73

In phase

Front 74

Which part of the diode represents the negative side?

Back 74

Cathode

Front 75

Which part of the diode represents the positive side?

Back 75

Anode

Front 76

When the diode blocks current from passing, it is considered to be:

Back 76

Reversed Biased

Front 77

What is the output of a half wave rectifier with the anode facing the transformer?

Back 77

Positive Pulsating D/C

Front 78

When the diode allows current to pass, it is considered to be:

Back 78

Forward Biased

Front 79

What are the three Classification of rectifiers?

Back 79

Half wave Full wave, and Bridge

Front 80

What is the key component of all rectifier circuits in a power supply?

Back 80

The Diode

Front 81

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?

Back 81

Higher

Front 82

What is defined as the total opposition to current that is present in a circuit?

Back 82

Impedance

Front 83

When curent is first applied to an inductor in a D/C circuit, the inductor acts like an:

Back 83

Open

Front 84

If a high frequency is present on an inductor, what type a current would be observed?

Back 84

Minimum

Front 85

what is the unit of measure for an inductor?

Back 85

The Henry: H

Front 86

The amount of inductive reactance is dependent on inductance (or the size of the inductor) and:

Back 86

Frequency

Front 87

Once a inductor has fully energized in a D/C circuit, the inductor acts like a:

Back 87

Short

Front 88

The process by which a current carrying inductor induces CEMF into itself, due to the moving magnetic field of changing current is known as:

Back 88

Self-Inductance

Front 89

The steady opposition to A/C current flow offered in an inductor is known as:

Back 89

Inductive Reactance

Front 90

What is the unit of measure for inductive reactance?

Back 90

Ohms

Front 91

The rate at which current changes in a conductor is called a:

Back 91

Time Constant

Front 92

How many time constants does it take for an inductor to achieve maximum current flow?

Back 92

Five