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BMET 102 > Power Supplies And Amplifiers > Flashcards

Power Supplies And Amplifiers Flashcards

0
Q

How many sections do power supplies usually have?

A

5

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1
Q

What is the purpose of a power supply?

A

To convert AC power to DC power

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2
Q

What is the purpose of a power supplies input circuit?

A

To step up or step down to AC input power

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3
Q

True or false a transformer is used in a power supplies and input circuit?

A

True

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4
Q

What is the purpose of a power supplies rectifier circuit?

A

To convert AC to pulsating DC

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5
Q

What is the purpose of a power supplies filter circuit?

A

To change pulsating AC to smooth DC

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6
Q

What is the purpose of a power supplies regulator circuit?

A

To maintain a constant output voltage

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7
Q

What is the purpose of a power supplies protection circuit?

A

To prevent damage to the power supply

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8
Q

What are used in a power supply filter circuit?

A

Reactive components

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9
Q

How many diodes are used in a half wave rectifier circuit?

A

One

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10
Q

How many diodes does a full wave rectifier use?

A

Two

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11
Q

How many diodes are used in a bridge rectifier circuit?

A

Four

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12
Q

What is the purpose of a half/full wave rectifier circuit?

A

To convert AC to pulsating DC

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13
Q

In a half wave rectifier diode performs rectification and load resistor develops what?

A

Output

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14
Q

In a full and a half wave rectifier a continuous AC produces what?

A

It continuous pulsating output at the same frequency

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15
Q

In a half wave rectifier a continuous AC input produces a pulsating output frequency at how many times the input frequency?

A

Twice

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16
Q

What is the purpose of a bridge rectifier circuit?

A

To convert AC to pulsating DC

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17
Q

What is the purpose of the diodes D1- D4 in a bridge rectifier?

A

Reification

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18
Q

In a bridge rectifier what develops the output signal?

A

RL

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19
Q

What is the purpose of a series voltage regulator?

A

Adjust it voltage drop to maintain a constant eat out

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20
Q

In a voltage regulator what Adjust voltage drop under varying conditions?

A

R1

21
Q

What is the purpose of a parallel voltage regulator?

A

It adjust its current flow to maintain a constant Eout

22
Q

When Ford biased a Zener dido acts like a junction diode having a voltage drop of how many volts?

A

0.7

23
Q

When reverse biased Zener diode acts like what?

A

Open switch

24
Q

When reverse biased above the breakdown (Vz) Zener diode has a voltage drop equal to what?

A

The Vz

25
Q

What is the purpose of a Zener diode regulator circuits?

A

To maintain a constant Vout

26
Q

In a Zener diode regulator Q1 maintains a constant emitter voltage by effectively doing what?

A

Changing its internal emitter to collector resistance

27
Q

What are the five sections of a power supply?

A

Input, rectifier, filter, regulator, protection.

28
Q

What section of the power supply uses a transformer to step up or step down the AC voltage?

A

Input

29
Q

What section of the power supply turns AC into pulsating DC?

A

Rectifier

30
Q

What section of the power supply turns pulsating DC into smooth unregulated DC?

A

Filter

31
Q

What section of the power supply maintains a constant DC voltage?

A

Regulator

32
Q

What section of the power supply the text to circuit from overload?

A

Protection

33
Q

What is the purpose of the half wave rectifier, full wave rectifier, and the bridge rectifier?

A

Turn AC into pulsating DC

34
Q

What is the purpose of a series voltage regulator, Parallel voltage regulator, and a Zener voltage regulator is?

A

Maintain a constant DC voltage

35
Q

In an IC voltage regulator 78 means you have what type of voltage?

A

Positive

36
Q

IC voltage regulator 79 means you have what type of voltage?

A

Negative

37
Q

What is the purpose of a general multistate transistor amplifier?

A

To increase gain

38
Q

In a general multistage transistor amplifier cascade refers to what?

A

How the output of the amplifier is applied to the input of another

39
Q

When several amplifiers are connected together each amp is called what?

A

Stage

40
Q

Most stages are designed to have a gain of what?

A

10

41
Q

What are the four methods of cascading?

A

RC coupling, LC coupling, transformer coupling, and direct couple

42
Q

True or false, FETs are a normally off device

A

False

43
Q

In an FET with a P channel, which way does current flow?

A

From drain to source

44
Q

In an FET with a N channel, which way does current flow?

A

From source to drain

45
Q

Current carries enter the FET through what?

A

Source

46
Q

Current carriers leave the FET through what?

A

Drain (Id)

47
Q

Flow of current carriers through the FET are controlled by what?

A

Gate

48
Q

What do FETs operate on?

A

Small reverse bias

49
Q

What refers to the voltage difference between the gate and the source?

A

Vgs

50
Q

Is Vgs increases, what happens to ID?

A

Decrease

BMET 102 (4 decks)

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