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AAS 2 > Solid State Devices > Flashcards

Solid State Devices Flashcards

1
Q

This type of transistor bias consists of a resistor connected between the collector supply voltage and the base

A

Base current or fixed bias

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2
Q

A standard PN Junction diode has a ratio of one (1) impurity atom per 10 million semiconductor atoms. What type of diode commonly found in oscillators has a ratio of 1,000 impurity atoms to 10 million semiconductor atoms?

A

Tunnel Diode

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3
Q

A common collector amplifier has what type of output resistance?

A

Low

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4
Q

What is the formula for finding current gain in a common base BJT?

A

(IC2-IC1)/(IE2-IE1)

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5
Q

What is the maximum number of electrons allowed in the 4th shell of an atom (Pauli’s Exclusion Principle.)?

A

32

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6
Q

Which class of amplifier has the highest fidelity?

A

Class A

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7
Q

The greatest application of transistors is for use as what?

A

Amplifiers

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8
Q

Diodes used to mix signals together or detect the presence of a signal are referred to as what?

A

Signal Diodes

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9
Q

If the positive lead of a multimeter is connected to the “N” material and the negative lead to the “P” material of a PN junction diode, the depletion region will do what?

A

Increase

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10
Q

What are the least number diodes needed for a full-wave rectifier?

A

2

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11
Q

What solid state device is used to control both AC and DC power?

A

Thyristors

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12
Q

Why is a full wave rectifier more efficient than a half wave rectifier?

A

It uses both halves of the AC sine wave

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13
Q

Which statement best describes negative temperature coefficient?

A

As temperature goes up, resistance goes down

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14
Q

Which energy band will you never find electrons residing in it?

A

Forbidden Band

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15
Q

Which configuration of Bipolar Junction Transistor phase shifts the input signal 180 degrees at the output?

A

Common Emitter

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16
Q

What solid state device consists of three terminal leads made of one emitter and two base leads?

A

Unijunction Transistor (UJT)

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17
Q

What is the purpose of the base lead of a BJT?

A

Controls majority carriers

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18
Q

Which of the following is a valuable property of a solid state device?

A

Durability

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19
Q

To forward bias a NPN Transistor

A

Base +, Emitter -; Collector +, Emitter -

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20
Q

What solid state device consists of three terminal leads made of a source a gate and a drain?

A

JFET

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21
Q

Which class amplifier allows current to flow for approximately 180 degrees of input signal?

A

Class B

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22
Q

What solid state device consists of four leads made of a source, a gate, a drain and a substrate?

A

MOSFET

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23
Q

The “P” material of an NPN BJT corresponds to which lead?

A

Base

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24
Q

Which solid state device incorporates an LED that shines through a window onto a photosensitive device?

A

Optocoupler

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25
Q

Another name for the upper energy band of an atom is known as ?

A

The conductor band

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26
Q

What is the primary use for a Varactor diode?

A

communication circuits

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27
Q

Tunnel diodes have a “Negative Resistance Region.” Within this region, as biasing voltage __________, current flow __________.

A

Increases, Decreases

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28
Q

Which class of amplifier has the highest efficiency?

A

Class C

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29
Q

What is the percentage of gain of an amplifier with input power of 1 W and output power of 5 W?

A

500%

30
Q

As a ____________ diode is conducting current, there is a spot where current decreases as the voltage across the diode increases.

A

Tunnel

31
Q

What is the approximate forward bias voltage of a Silicon diode?

A

600mV

32
Q

When a small part of the amplifier signal begins to oscillate from the output and is sent back to the input, this is known as________?

A

Feedback

33
Q

During the doping process, if an impurity increases the number of holes in semiconductor material, the impurity is known as?

A

P-Type Material

34
Q

Current in a transistor is controlled by?

A

Varying the voltage

35
Q

On a common emitter amplifier, the output is on the ________ .

A

Collector

36
Q

What is the primary use for a Zener diode?

A

Voltage control

37
Q

What component is used as a switch to turn on or off small or large amounts of power and performs this function with no moving parts?

A

SCR

38
Q

Which class amplifier allows current to flow for less than one half cycle of input signal?

A

Class C

39
Q

What is the approximate forward bias voltage of a Germanium diode?

A

300mV

40
Q

This type of transistor bias is best for improving stability.

A

Combination bias

41
Q

A common base amplifier has what type of output resistance?

A

High

42
Q

What is another term used for a Schottky diode?

A

Hot carrier diode

43
Q

DC voltages or currents that exist in a circuit before the application of a signal are referred to as what?

A

Quiescent state voltages/currents

44
Q

During the doping process, if an impurity increases the number of free electrons in semiconductor material, the impurity is known as?

A

N-Type material

45
Q

Beta (transistor gain) is a comparison of collector current with respect to _______________ current.

A

Base

46
Q

On a common collector amplifier, the output is on the ______ .

A

Emitter

47
Q

The greatest application of tunnel diodes is for use as?

A

Oscillators

48
Q

Which statement best describes Positive Temperature coefficient?

A

As temperature goes up, resistance goes up

49
Q

To forward bias a PNP Transistor

A

Base -, Emitter+; Collector -, Emitter +

50
Q

If the power source to a diode is connected so the voltage aids the junction, it will increase the junction barrier and offer high resistance to current flow. This is known as____________.

A

Reverse Bias

51
Q

What is the formula for finding current gain in a common collector BJT?

A

(IE2-IE1)/(IB2-IB1)

52
Q

How many contacts are associated with a BJT transistor?

A

3

53
Q

______________ is the process of sharing valence electrons, resulting in the formation of crystals.

A

Covalent bonding

54
Q

Amplifiers for increasing ___________ have a small load resistance.

A

Current

55
Q

What is the formula for finding current gain in a common emitter BJT?

A

(IC2-IC1)/(IB2-IB1)

56
Q

In order to prevent damage during shipping, what safety device is normally attached to the leads of a MOSFET?

A

Shorting spring

57
Q

What type of material does not have a forbidden energy band or a very small forbidden energy band?

A

Conductor

58
Q

On a common base amplifier, the input is on the ________ .

A

Emitter

59
Q

How much forward bias is typically required for a Germanium (Ge) diode to begin to conduct?

A

0.3V

60
Q

In a JFET, when resistance decreases-

A

Current flow increases

61
Q

Which solid state device is used to directly convert light into electrical energy?

A

Photovoltaic Cell

62
Q

In a rectifier circuit, to provide the best filtering of AC ripple, a capacitor should have a _______________ _______________ time constant is required.

A

Long discharging

63
Q

Which class amplifier allows current to flow through 360 degrees of input signal?

A

Class A

64
Q

What is the waveform referred to on an oscilloscope resulting from a half wave rectifier?

A

Pulsating DC

65
Q

A common emitter amplifier has what type of output resistance?

A

Medium

66
Q

The material used to construct an LED determines the diode’s what?

A

Color

67
Q

What are transistors mostly used for in electronic circuits?

A

Switches

68
Q

In a PN junction diode that is forward biased, as supply voltage increase what happens to current?

A

Increases

69
Q

Which type of diode acts as a variable capacitor?

A

Varactor

70
Q

What is the quiescent state of an amplifier?

A

The static operating (ready to work) point

AAS 2 (6 decks)

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