Prelim 3

Question 1

Electrical signals of which amplitude changes continuously

with respect to time with no breaks or discontinuities.

Answer 1

Analog Signals

Question 2

Electrical signals that are described as discrete; their
amplitude maintains constant level for a prescribed period of time and then
it changes to another level with respect to time with no breaks or
discontinuities.

Answer 2

Digital Signals

Question 3

Digital signal with only two levels possible.

Answer 3

Binary Signal

Question 4

Is the mathematical analysis of the frequency, bandwidth, and
voltage level of a signal?

Answer 4

Signal Analysis

Question 5

A signal that repeats at a uniform rate.

Answer 5

Periodic Wave

Question 6

A description of signal with respect to time.

Answer 6

Time-domain

Representation

Question 7

A description of signal with respect to its frequency.

Answer 7

Frequency Domain

Representation

Question 8

A frequency-domain instrument that shows

amplitude-versus-frequency plot.

Answer 8

Spectrum Analyzer

Question 9

A mathematical series developed in 1826 by French physicist

and mathematician Baron Jean Fourier used to analyze complex periodic wave.

Answer 9

Fourier Series

Question 10

A mathematical tool that allows us to move back and forth
between the time and frequency domains. It is used in signal analysis to
represent the sinusoidal components of nonsinusoidal periodic waveforms.

Answer 10

Fourier Series

Question 11

Is the integral multiple of the fundamental frequency?

Answer 11

Harmonic

Question 12

Is the first harmonic and is equal to the frequency

(repetition rate) of the waveform.

Answer 12

Fundamental Frequency

Question 13

If a periodic voltage waveform is symmetric about the vertical
axis, it is said to have axes, or mirror, symmetry and is called an ________.

Answer 13

even function

Question 14

If a periodic voltage waveform is symmetric about a line
midway between the vertical axis and the negative horizontal axis and passing
through the coordinate origin, it is said to have point, or skew, symmetry is
called an ______.

Answer 14

odd function

Question 15

The ________ of a waveform consists of all the frequencies
contained in the waveform and their respective amplitudes plotted in the
frequency domain.

Answer 15

frequency spectrum

Question 16

The difference between the highest and lowest frequencies
contained in the information. It is also the difference between the highest
and lowest frequencies that the channel will allow to pass through it.

Answer 16

Bandwidth of an

information signal

Question 17

The ratio of the active time of the pulse to the period of the
waveform.

Answer 17

Duty Cycle

Question 18

The process of combining two or more signals

Answer 18

Mixing

Question 19

Occurs when two or more signals combine in a linear device,
such as a passive network or a small-signal amplifier. Also called linear
mixing.

Answer 19

Linear Summing

Question 20

An amplifier where the output is simply the original input

signal amplified by its gain.

Answer 20

Linear Amplifier

Question 21

Occurs when two or more signals are combined in a nonlinear

device such as a diode or large-signal amplifier.

Answer 21

Nonlinear Mixing

Question 22

Undesired generation of multiples or harmonics of that

frequency.

Answer 22

Harmonic Distortion

Question 23

The generation of any unwanted cross-product frequency when

two or more frequencies are mixed in a nonlinear device.

Answer 23

Intermodulation Distortion

Question 24

A device that produces electrical oscillations

Answer 24

Oscillator

Question 25

A system with an Open Loop gain Amplifier circuit, a feedback system and a summer. Input > Summer > Amplifier >> Feedback & output

Answer 25

Feedback Oscillator

Question 26

A stable and low frequency oscillator commonly used to produce 1 Hz to 5 MHz signal.

Answer 26

Wien-Bridge Oscillator

Question 27

Any repetitive wave that is comprised of more than one | harmonically related sine or cosine wave.

Answer 27

Nonsinusoidal / | Complex Wave

Question 28

If a periodic voltage waveform is such that the waveform for the first half cycle repeats itself except with the opposite sign for the second half cycle, it is said to have ________.

Answer 28

Half-wave Symmetry

Question 29

This word means to fluctuate between two states or conditions.

Answer 29

Oscillate

Question 30

An amplifier with a feedback loop or path for energy to | propagate from the output back to the input.

Answer 30

Feedback

Question 31

Is an untuned RC phase shift oscillator that uses both positive and negative feedback? The oscillator that Hewlett and Packard used in their original signal generator design.

Answer 31

Wien-bridge Oscillator

Question 32

Are oscillator circuits that utilize LC tank circuits for the frequency determining components?

Answer 32

LC Oscillators

Question 33

An LC oscillator that uses a tapped coil.

Answer 33

Hartley Oscillator

Question 34

The operation of this oscillator is very similar to that of | Hartley except that a capacitive divider is used instead of a tapped coil.

Answer 34

Colpitts Oscillator

Question 35

An oscillator circuit identical to the Colpitts except with | the addition of a small capacitor Cs placed in series with L1.

Answer 35

Clapp Oscillator

Question 36

The ability of an oscillator to remain at a fixed frequency.

Answer 36

Frequency Stability

Question 37

Feedback oscillator circuits where a crystal is used for the | frequency determining component.

Answer 37

Crystal Oscillator

Question 38

The _______ occurs when oscillating mechanical stresses applied across a crystal lattice structure generate electrical oscillations and vice versa.

Answer 38

Piezoelectric Effect