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ET1 SEP EXAM 2018 > NAVEDTRA 14180A, NAVY ELECTRICITY AND ELECTRONICS TRAINING SERIES, MODULE 8-AMPLIFIERS > Flashcards

NAVEDTRA 14180A, NAVY ELECTRICITY AND ELECTRONICS TRAINING SERIES, MODULE 8-AMPLIFIERS Flashcards

1
Q

Which term that describes the size of a signal?

A

Amplitude

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2
Q

Which type of device enables an input signal to control an output signal?

A

Amplifier

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3
Q

Which standard block diagram symbol is used for an amplifier?

A

Triangle

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4
Q

Which two ways can most amplifiers be classified?

A

Function or Frequency response

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5
Q

What is an amplifier in which the output signal voltage is larger than the input signal voltage?

A

Voltage amplifier

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6
Q

What is an amplifier in which the output signal power is greater than the input signal power?

A

Power amplifier

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7
Q

Audio amplifier, RF amplifier, along with what else are the three broad categories of frequency response for amplifiers?

A

Video amplifier

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8
Q

An audio amplifier is designated to amplify frequencies between 15 Hz and what?

A

20 kHz

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9
Q

RF amplifiers are designed to amplify frequencies between 10kHz and what?

A

100,000 MHz

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10
Q

A video amplifier is an amplifier designed to amplify a band of frequencies from 10 Hz to what?

A

6 MHz

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11
Q

How many classes of operation for an amplifier are there?

A

Four

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12
Q

Which class of amplifier has the characteristics of good fidelity and low efficiency?

A

Class A

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13
Q

Which term means that the output signal is just like the input signal in all respects except amplitude?

A

Fidelity

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14
Q

What is any undesired change in a signal from input to output?

A

Distortion

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15
Q

Which operating class is the amplifier if the amplifying device is biased in such a way that current flows in the device for 51%-99% of the input signal?

A

Class AB

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16
Q

Which type of amplifier has the worst fidelity?

A

Class C

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17
Q

What is the process known as of transferring energy between circuits?

A

Coupling

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18
Q

What is the most commonly used coupling in amplifiers?

A

RC Coupling

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19
Q

What is caused by a small part of the signal from the amplifier output being sent back to the input of the amplifier?

A

Oscillation

20
Q

What is the process of sending part of the output signal of an amplifier back to the input of the amplifier called?

A

Feedback

21
Q

What is accomplished by adding part of the output signal in phase with the input signal?

A

Positive feedback

22
Q

What is accomplished by adding part of the output signal out of phase with the input signal?

A

Negative feedback

23
Q

An audio amplifier has been described as an amplifier with a frequency response from 15 Hz to what?

A

20 kHz

24
Q

Which type of device produces two signals that differ in phase from each other from a single input signal?

A

Phase splitter

25
Q

Which type of amplifier uses two transistors whose output signals are added together to provide a larger gain (usually a power gain) than a single transistor could provide?

A

Push-pull

26
Q

Which type of amplifier can have two input signals and/or two output signals?

A

Differential

27
Q

Which type of amplifier can add, subtract, multiply, divide, and even perform the calculus operations of integration and differentiation?

A

Operational

28
Q

How many outputs can the differential amplifier have?

A

Two

29
Q

Which type of amplifier is designed to be used with other circuit components to perform either computing functions (addition, subtraction) or some type of transfer operation, such as filtering?

A

Operational

30
Q

How many stages are there within the operational amplifier?

A

Three

31
Q

A typical operational amplifier could have a voltage gain of what?

A

200,000

32
Q

Which type of operation does the operational amplifier have without feedback?

A

Open-loop

33
Q

What is a point in a circuit which is at ground potential (0 volts) but is NOT connected to ground?

A

Virtual ground

34
Q

What will always produce an output that is equal to the sum of the input signals but opposite in polarity?

A

Adder circuit

35
Q

What property of the circuit is determined by the ratio between the feedback resistor and the input resistors?

A

Gain

36
Q

Which circuit multiplies each input by a factor (the factor is determined by circuit design) and then adds these values together?

A

Scaling amplifier

37
Q

That magnetic amplifier has very high efficiency (up to what percent)?

A

90

38
Q

What does the magnetic amplifier use to amplify a signal?

A

Electromagnetism

39
Q

What is defined as the measure of the ability of a material to act as a path for additional magnetic lines of force?

A

Permeability

40
Q

What is defined as the number of lines of force passing through a given area?

A

Flux density

41
Q

What is the magnetomotive force developed by 1 ampere of current flowing in a coil of one turn called?

A

Ampere-turn

42
Q

What is a magnetic-core reactor (coil) whose reactance is controlled by changing the permeability of a core?

A

Saturable-core reactor

43
Q

What is the point of maximum curvature on a magnetization curve?

A

Knee of the curve

44
Q

What does a magnetic amplifier have in addition to a saturable-core reactor?

A

Rectifier

45
Q

What is the general symbol for an amplifier?

A

Triangle

46
Q

Magnetic amplifiers are power amplifiers with a frequency response normally limited to what or below?

A

100 hertz

47
Q

What allows a d.c. bias voltage to be applied to the saturable-core reactor while a.c. control signals are applied to a separate control winding?

A

Bias winding

ET1 SEP EXAM 2018 (28 decks)

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