320 Test 1 Flashcards Preview

Module 4, Lesson 3 > 320 Test 1 > Flashcards

Flashcards in 320 Test 1 Deck (57):
1

Conductors

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

2

Insulators

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

3

Semiconductors

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

4

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

N type

5

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

Positive

6

Is conduction possible in a germanium crystal before doping

No

7

What are the minority carriers in a P-type material

Positive charges (holes)

8

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

Phosphorus

9

Diode

Allows current to pass through it in only one direction

10

Forward bias

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

11

Reverse bias

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

12

Germanium diode's threshold voltage

3/10

13

Silicon diode's threshold voltage

6/10

14

Peak-inverse voltage

Breakdown voltage for the diode

15

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

Bad

16

Is a reverse biased diode's resistance high or low

Low

17

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

Produces enough heat to damage the diode permanently

18

Rectifiers

Circuits that convert AC power to DC power

19

Ripple

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

20

Half-wave recifier

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

21

Pulsating direct current

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

22

Filtering

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

23

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

A pulsating DC waveform

24

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

1/2

25

What is the amount of curvature in a signal called

The ripple

26

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

Diode, resistor, and AC

27

Full-wave rectifier

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

28

How many diodes are in a full-wave rectifier

2

29

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

The full-wave rectifiers output is doubled

30

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

More smooth

31

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

Less

32

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

Center tapped transformer

33

Bridge rectifier

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

34

How many diodes are in a full-wave bridge rectifier

4

35

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

Full-wave rectifier

36

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

Full-wave rectifier

37

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

No

38

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

Pulsating DC

39

Zener Diode

A solid-state diode used for voltage regulation

40

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

They are designed to operate reverse bias

41

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

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

42

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

To in sure voltage regulation

43

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

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

44

Doping

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

45

Majority carriers

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

46

Minority carriers

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

47

2 most common elements in a semiconductor

Silicon and germanium

48

Diodes allow current to pass through them...

When they are forward biased

49

The forward bias in a semiconductor diode....

Increases with an increase in bias voltage

50

Threshold voltage is....

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

51

Voltage across a zener diode remains constant....

At zener voltage

52

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

Small

53

The simplest rectifier circuit is

Half-wave rectifier

54

A half-wave rectifier circuit is a

Resistor diode combination across an AC source

55

The full-wave bridge rectifier is

Always used

56

Ripple is

The AC component of a rectifier output

57

The rectifier with the highest ripple factor is the

Half-wave rectifier