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ELECS > ELECS > Flashcards

ELECS Flashcards

1
Q

Which transistor configuration is more stable?

A

Voltage Divider Biased

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2
Q

It is where the loadline intersects with the saturation point;

A

saturation region

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3
Q

Quiescent or Q-point position is dependent on

A

1) load resistance
2) supply voltage
3) collector current

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4
Q

Which class of amplifier has the highest efficiency?

A

Class C

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5
Q

It is the material that lead to a deficiency of electrons and therefore an excess of positive charge carriers or “holes.”

A

P-type semiconductor

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6
Q

In which BJT configuration is the output signal taken between the collector and the emitter?

A

Common Collector

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7
Q

The transistor terminal that handles most current.

A

emitter

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8
Q

Which is a characteristic of Class AB amplifiers?
A) Both transistors conduct for more than 180 degrees but less than 360 degrees.
B) Only one transistor conducts for 360 degrees.
C) Both transistors conduct for exactly 180 degrees.
D) Only one transistor conducts for 360 degrees.

A

A) Both transistors conduct for more than 180 degrees but less than 360 degrees.

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9
Q

The scientists who were responsible for the 1947 invention of the transistor were:

A

1) Walter Brattain
2) William Shockley
3) John Bardeen

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10
Q

What is the primary advantage of Class D amplifiers?

A

High efficiency

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11
Q

What device employs only an electron or hole?

A

unipolar

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12
Q

Which BJT configuration provides the same polarity at both input and output terminals?

A

Common Collector

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13
Q

When the base-emitter junction is forward biased and Base-collector junction is forward biased the transistor operation is in _____.

A

saturation

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14
Q

When the transistor is heated, what will happen to the transistor?

A

The transistor will saturate

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15
Q

Which BJT configuration is often used in RF amplifier circuits due to its high input impedance and low output impedance?

A

Common Base

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16
Q

It is also called the common collector forward current amplification factor.

A

gamma

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17
Q

Which BJT configuration exhibits a voltage gain less than unity?

A

Emitter Follower

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18
Q

Which BJT configuration provides the highest input impedance?

A

Common Base

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19
Q

The electron-hole pair is produced by

A

Recombination

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20
Q

It is where the loadline intersects with the cut-off point.

A

cut-off region

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21
Q

When the value of the base current is equal to zero, what does it mean?

A

The collector current is approximately equal to the emitter current

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22
Q

It is also called the maximum possible VCE.

A

Cut-off voltage

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23
Q

Which BJT configuration offers the highest current gain?

A

Darlington Pair

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24
Q

Which BJT configuration exhibits a phase shift of 180 degrees between input and output signals?

A

Emitter Follower

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25
Q

What is the main drawback of Class C amplifiers?

A

Low efficiency

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26
Q

Which of the following statements is true about Class A amplifiers?
A) They have a high efficiency but high distortion.
B) They have a high efficiency and low distortion.
C) They have a low efficiency but low distortion
D) They have a low efficiency and high distortion

A

C) They have a low efficiency but low distortion

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27
Q

When Vce is a negative value, what does it mean?

A

The transistor current will be set to the maximum value

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28
Q

Which class of amplifier is commonly used in applications where efficiency is critical, such as in RF transmitters?

A

Class C

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29
Q

The most widely used semiconductive material in electronic devices is

A

Silicon

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30
Q

It is the intersection between the loadline and the given value of Ib

A

quiescent point

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31
Q

In which BJT configuration is the emitter current the sum of the base and collector currents?

A

Common Collector

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32
Q

A semiconductor device that Amplifies, Oscillates, or Switches the flow of current between two terminals

A

transistors

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33
Q

It is also called the maximum possible current that can be delivered by the transistor

A

saturation current

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34
Q

It is situated opposite to the emitter and always in reversed bias.

A

collector

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35
Q

It is the impurities that result in an excess of electrons, or negative charges

A

N-type semiconductor

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36
Q

In which BJT configuration is the input signal applied between the emitter and the base?

A

Common Base

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37
Q

When the base-emitter junction is forward biased and Base-collector junction is reversed biased the transistor operation is in

A

active

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38
Q

If the value of Vce is negative, what does it mean?

A

The transistor is saturated

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39
Q

Which BJT configuration offers the highest voltage gain?

A

Common Emitter

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40
Q

It describes the values of Ic and Vce across the load from the cut-off to the saturated condition.

A

Loadline

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41
Q

It is the point where the values of the collector current equal to zero.

A

Cut-off point

42
Q

A trivalent impurity is added to silicon to create

A

a p-type semiconductor

43
Q

Which of the following statements is true about the transistor?
A) The base terminal must not be connected to the ground
B) The base material is thicker than other terminal
C) The base material must always be P-type material
D) The base-emitter voltage is always equal to the potential barrier

A

D) The base-emitter voltage is always equal to the potential barrier

44
Q

The barrier potential for germanium devices is

A

0.3 V

45
Q

It is the ratio of the output current Ic to the input current IB

A

beta

46
Q

characteristic of Class D amplifiers?

A

They operate as switch-mode amplifiers.

47
Q

Which BJT configuration provides high input impedance and low output impedance?

A

Common Collector

48
Q

In a Class B amplifier, each transistor conducts how much of the input cycle?

A

180 degrees

49
Q

The collector terminal for PNP type transistor must be reversed biased

A

True

50
Q

It is a highly doped material to inject a large number of charged carriers.

A

emitter

51
Q

When the transistor is off, what does it mean?

A

The collector current is set to its minimum value

52
Q

It is also called the maximum possible collector current.

A

saturation current

53
Q

Collector-emitter resistance of ideal transistor at cut-off

A

infinite

54
Q

Class C amplifiers are primarily used in which type of application?

A

RF amplification

55
Q

When the base-emitter junction is reversed biased and Base-collector junction is reversed biased the transistor operation is
in ________.

A

cut-off

56
Q

What is the main advantage of Class C amplifiers?

A

High efficiency

57
Q

Class B amplifiers are most commonly used in which type of applications?

A

Audio power amplification

58
Q

Which BJT configuration is commonly used as a voltage buffer?

A

Emitter Follower

59
Q

In which BJT configuration is the input signal applied to the base and output taken from the emitter?

A

Common Collector

60
Q

It is the ratio of the collector current to the emitter current.

A

alpha

61
Q

It is determined by Vce and Ic.

A

Operating point

62
Q

Class A amplifiers operate in which region of the transistor’s characteristic curve?

A

Active

63
Q

What is the main disadvantage of Class A amplifiers?

A

Low efficiency

64
Q

If VCE is less than or equal to zero 0V the transistor is

A

at saturation region

65
Q

The flow of electrons in an NPN transistor when used in an electronic circuit is from

A

Emitter to Collector

66
Q

What is true about transistor construction?
A) The base-emitter junction is thinner than the base-collector junction
B) The base-emitter junction is thicker than the base-collector junction
C) The amount of base current cannot be measured
D) Emitted is the lightly doped material

A

A) The base-emitter junction is thinner than the base-collector junction

67
Q

It is lightly doped material so that most of the charge carriers pass to the collector.

A

base

68
Q

The bipolar junction transistor can perform the following functions, except
a. switching device
b. diode functions
c. voltage controlled amplifier
d. current controlled amplifier

A

c. voltage controlled amplifier

69
Q

Which BJT configuration offers the highest power gain?

A

Darlington Pair

70
Q

In Class AB amplifiers, the biasing is set to ensure which of the following?
a. One transistor operates in the cut-off region and the other in the saturation region.
b. Both transistors operate in the saturation region.
c. Both transistors operate in active regions.
d. Both transistors operate in the cut-off region.

A

a. One transistor operates in the cut-off region and the other in the saturation region.

71
Q

The original transistor is called

A

point-contact transistor

72
Q

It is the locus of all possible operating points of a transistor

A

loadline

73
Q

Class D amplifiers are also known as

A

Switching amplifiers

74
Q

In which BJT configuration is the collector connected to the ground (or common reference)?

A

Common Collector

75
Q

Operates as an amplifier

A

Active Region

76
Q

“fully-ON” operates as a switch

A

Saturation

77
Q

“fully-OFF” operating as a switch

A

Cut-off

78
Q

has Voltage Gain but no Current Gain.

A

Common Base Configuration

79
Q

has both Current and Voltage Gain.

A

Common Emitter Configuration

80
Q

has Current Gain but no Voltage Gain.

A

Common Collector Configuration

81
Q

the BASE connection is common to both the input signal AND the output signal.

A

Common Base

82
Q

The collector current output is less than the

A

emitter current input

83
Q

Current gain for Common Base

A

“1” (unity) or less

84
Q

The common base configuration “_________” the input signal

A

attenuates

85
Q

Non-inverting voltage amplifier circuit (Vin and Vout is In-phase)

A

Common Base

86
Q

Used in single stage amplifier circuits such as microphone pre-amplifier or radio frequency ( Rƒ) amplifiers due to its very good high frequency
response

A

Common Base

87
Q

The current flowing out of the transistor must be equal to the currents flowing into the transistor as the emitter current is given as ie = ic + ib.

A

Common Emitter

88
Q

The current gain, ________ is quite large as it is the ratio of ic/ib

A

beta ( β)

89
Q

has a value between 20 and 200 for most general-purpose transistors

A

beta ( β)

90
Q

Has a greater input impedance, current and power gain than that of the common base configuration but its voltage gain is much lower.

A

Common Emitter

91
Q

an inverting amplifier circuit, resulting output signal has a 180o phase-shift with regards to the input voltage signal

A

Common Emitter

92
Q

collector is connected to the ground through the supply.

A

Common Collector

93
Q

input signal is connected directly to the base terminal, while the output signal is taken from across the emitter load resistor

A

Common Collector

94
Q

Commonly known as a voltage follower or emitter follower circuit

A

Common Collector

95
Q

very useful for impedance-matching applications

A

Common Collector

96
Q

Very high input impedance and relatively low output impedance

A

Common Collector

97
Q

It has a current gain approximately equal to the β value of the transistor

A

Common Collector

98
Q

It is a non-inverting circuit in that the signal voltages of vin and vout are “in-phase”

A

Common Collector

99
Q

Has a voltage gain of about “1” (unity gain), it can considered as a voltagebuffer.

A

Common Collector

100
Q

central operating point

A

“Quiescent Operating Point”, or Q-point for short

ELECS (10 decks)

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