320 Test 1

Question 1

Conductors

Answer 1

Wire, cable, or other body or medium that can carry electric current

Question 2

Insulators

Answer 2

A device having electrical resistance and used for supporting or separating conductors

Question 3

Semiconductors

Answer 3

A solid crystalline material whose electrical conductivity is between that of a conductor and an insulator

Question 4

When arsenic is added to germanium it becomes what type of material

Answer 4

N type

Question 5

Holes are considered to be what type of carriers in P-type material

Answer 5

Positive

Question 6

Is conduction possible in a germanium crystal before doping

Answer 6

No

Question 7

What are the minority carriers in a P-type material

Answer 7

Positive charges (holes)

Question 8

What impurities are added to silicon to make N-type material

Answer 8

Phosphorus

Question 9

Diode

Answer 9

Allows current to pass through it in only one direction

Question 10

Forward bias

Answer 10

Voltage applied across a PN junction that causes it to conduct current. The positive voltage is applied to the P material, and the negative to the N material

Question 11

Reverse bias

Answer 11

Voltage applied across a PN junction that prevents it from conducting. Positive voltage is applied to the N material, and the negative to the P material

Question 12

Germanium diode’s threshold voltage

Answer 12

3/10

Question 13

Silicon diode’s threshold voltage

Answer 13

6/10

Question 14

Peak-inverse voltage

Answer 14

Breakdown voltage for the diode

Question 15

If a diode measures a low resistance in both directions, is it good or bad

Answer 15

Bad

Question 16

Is a reverse biased diode’s resistance high or low

Answer 16

Low

Question 17

What happens to a reverse biased diode if it has an excess of current for a long period of time

Answer 17

Produces enough heat to damage the diode permanently

Question 18

Rectifiers

Answer 18

Circuits that convert AC power to DC power

Question 19

Ripple

Answer 19

Residual AC voltage in the output of a power supply, consisting of a small AC component riding on the DC component

Question 20

Half-wave recifier

Answer 20

A rectifier circuit using one diode which conducts for every other alternation of the AC input voltage

Question 21

Pulsating direct current

Answer 21

DC voltage or current with its amplitude changing in value, usually at regular intervals

Question 22

Filtering

Answer 22

The use of a group of components connected so there is little opposition to certain frequencies, but considerable opposition to others

Question 23

What DC waveform is available at the output of a half-wave rectifier

Answer 23

A pulsating DC waveform

Question 24

The half-wave rectifier conducts only what portion on the signal

Answer 24

1/2

Question 25

What is the amount of curvature in a signal called

Answer 25

The ripple

Question 26

What components do you need to make up a half-wave rectifier

Answer 26

Diode, resistor, and AC

Question 27

Full-wave rectifier

Answer 27

A rectifier circuit that usually using two diodes one of which conducts for each alternation of the AC input voltage

Question 28

How many diodes are in a full-wave rectifier

Answer 28

2

Question 29

What is the difference in output between the half-wave rectifier and the full-wave rectifier

Answer 29

The full-wave rectifiers output is doubled

Question 30

Is the full-wave rectifier's output more or less smooth than the half-wave rectifier's output

Answer 30

More smooth

Question 31

Is the full-wave rectifier's amplitude more or less than the half-wave rectifier's amplitude

Answer 31

Less

Question 32

What type of transformer is used in a full-wave rectifier

Answer 32

Center tapped transformer

Question 33

Bridge rectifier

Answer 33

A full-wave rectifier circuit in which four diodes are connected in a bridge arrangement

Question 34

How many diodes are in a full-wave bridge rectifier

Answer 34

4

Question 35

The full-wave bridge rectifiers output most closely approximates the output amplitude of what rectifier

Answer 35

Full-wave rectifier

Question 36

The full-wave bridge rectifiers output frequency most closely approximates the output frequency of which rectifier

Answer 36

Full-wave rectifier

Question 37

Do you use a center-tapped transformer in a full-wave bridge rectifier

Answer 37

No

Question 38

What type of output voltage does the full-wave bridge rectifier produce

Answer 38

Pulsating DC

Question 39

Zener Diode

Answer 39

A solid-state diode used for voltage regulation

Question 40

In terms of bias, how is a zener diode unique as compared to other diodes

Answer 40

They are designed to operate reverse bias

Question 41

In terms of current and voltage, how is a zener diode unique as compared to other diodes

Answer 41

They use reverse currents and voltage which remains constant in a diode while the current increases to a higher value

Question 42

Why would you use a zener diode instead of a standard diode

Answer 42

To in sure voltage regulation

Question 43

How is a zener diode reverse bias characteristic curve different than a standard diode characteristic curve

Answer 43

The breakdown voltage for a zener diode happens long before the breakdown on a standard diode

Question 44

Doping

Answer 44

The addition of impurities to a semiconductor to achieve a desired characteristic

Question 45

Majority carriers

Answer 45

The type of carrier, that is, electron or hole, that constitutes more than half the carriers in a semiconductor

Question 46

Minority carriers

Answer 46

The type of carrier, electron or hole, that constitutes less than half the total number of carriers in a semiconductor

Question 47

2 most common elements in a semiconductor

Answer 47

Silicon and germanium

Question 48

Diodes allow current to pass through them...

Answer 48

When they are forward biased

Question 49

The forward bias in a semiconductor diode....

Answer 49

Increases with an increase in bias voltage

Question 50

Threshold voltage is....

Answer 50

The bias voltage value reached that causes the current to increase sharply

Question 51

Voltage across a zener diode remains constant....

Answer 51

At zener voltage

Question 52

Will a good rectifier have a large or small amount of ripple

Answer 52

Small

Question 53

The simplest rectifier circuit is

Answer 53

Half-wave rectifier

Question 54

A half-wave rectifier circuit is a

Answer 54

Resistor diode combination across an AC source

Question 55

The full-wave bridge rectifier is

Answer 55

Always used

Question 56

Ripple is

Answer 56

The AC component of a rectifier output

Question 57

The rectifier with the highest ripple factor is the

Answer 57

Half-wave rectifier