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Module 4, Lesson 3 > 320 Test 1 > Flashcards

320 Test 1 Flashcards

1
Q

Conductors

A

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

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2
Q

Insulators

A

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

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3
Q

Semiconductors

A

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

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4
Q

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

A

N type

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5
Q

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

A

Positive

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6
Q

Is conduction possible in a germanium crystal before doping

A

No

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7
Q

What are the minority carriers in a P-type material

A

Positive charges (holes)

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8
Q

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

A

Phosphorus

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9
Q

Diode

A

Allows current to pass through it in only one direction

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10
Q

Forward bias

A

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

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11
Q

Reverse bias

A

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

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12
Q

Germanium diode’s threshold voltage

A

3/10

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13
Q

Silicon diode’s threshold voltage

A

6/10

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14
Q

Peak-inverse voltage

A

Breakdown voltage for the diode

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15
Q

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

A

Bad

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16
Q

Is a reverse biased diode’s resistance high or low

A

Low

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17
Q

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

A

Produces enough heat to damage the diode permanently

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18
Q

Rectifiers

A

Circuits that convert AC power to DC power

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19
Q

Ripple

A

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

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20
Q

Half-wave recifier

A

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

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21
Q

Pulsating direct current

A

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

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22
Q

Filtering

A

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

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23
Q

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

A

A pulsating DC waveform

24
Q

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

A

1/2

25
Q

What is the amount of curvature in a signal called

A

The ripple

26
Q

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

A

Diode, resistor, and AC

27
Q

Full-wave rectifier

A

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

28
Q

How many diodes are in a full-wave rectifier

A

2

29
Q

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

A

The full-wave rectifiers output is doubled

30
Q

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

A

More smooth

31
Q

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

A

Less

32
Q

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

A

Center tapped transformer

33
Q

Bridge rectifier

A

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

34
Q

How many diodes are in a full-wave bridge rectifier

A

4

35
Q

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

A

Full-wave rectifier

36
Q

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

A

Full-wave rectifier

37
Q

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

A

No

38
Q

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

A

Pulsating DC

39
Q

Zener Diode

A

A solid-state diode used for voltage regulation

40
Q

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

A

They are designed to operate reverse bias

41
Q

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

A

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

42
Q

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

A

To in sure voltage regulation

43
Q

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

A

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

44
Q

Doping

A

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

45
Q

Majority carriers

A

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

46
Q

Minority carriers

A

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

47
Q

2 most common elements in a semiconductor

A

Silicon and germanium

48
Q

Diodes allow current to pass through them…

A

When they are forward biased

49
Q

The forward bias in a semiconductor diode….

A

Increases with an increase in bias voltage

50
Q

Threshold voltage is….

A

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

51
Q

Voltage across a zener diode remains constant….

A

At zener voltage

52
Q

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

A

Small

53
Q

The simplest rectifier circuit is

A

Half-wave rectifier

54
Q

A half-wave rectifier circuit is a

A

Resistor diode combination across an AC source

55
Q

The full-wave bridge rectifier is

A

Always used

56
Q

Ripple is

A

The AC component of a rectifier output

57
Q

The rectifier with the highest ripple factor is the

A

Half-wave rectifier

Module 4, Lesson 3 (18 decks)

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