Question 1

____________ consists of a mixture of signals at all frequencies and at randomly occurring amplitudes.

Accepted Answer

A) Decibel units 
B) Frequency 
C) Bandwidth 
D) Noise 
A) Decibel units 
B) Frequency 
C) Bandwidth 
D) Noise D

Question 2

White noise is directly proportional to both temperature and _____________.

Accepted Answer

A) bandwidth 
B) AC voltage 
C) power transfer 
D) frequency 
A) bandwidth 
B) AC voltage 
C) power transfer 
D) frequency A

Question 3

You are troubleshooting a piece of equipment and you find that unauthorized modifications may have been performed on the equipment.What type of failure does this situation represent?

Accepted Answer

A) Faulty 
B) Complete 
C) Induced 
D) Poor system performance 
A) Faulty 
B) Complete 
C) Induced 
D) Poor system performance C

Question 4

The terms Johnson,thermal,and _____ noise may be used interchangeably.

Accepted Answer

A) white 
B) space 
C) internal 
D) external 
A) white 
B) space 
C) internal 
D) external

Question 5

What does the graphical display produced by an oscilloscope represent?

Accepted Answer

A) Signals in the frequency domain 
B) Time-domain representation 
C) Amplitude of each frequency component 
D) Amplitude characteristics 
A) Signals in the frequency domain 
B) Time-domain representation 
C) Amplitude of each frequency component 
D) Amplitude characteristics

Question 6

Which of the following defines frequency domain?

Accepted Answer

A) Square waves are made up of the fundamental and its odd -numbered harmonics 
B) Amplitude is viewed as a function of frequency rather than of time 
C) Amplitude of each harmonic decreases as the frequency increases 
D) Any or all of the sine or cosine terms may be zero, and there are no restrictions on their amplitudes 
A) Square waves are made up of the fundamental and its odd -numbered harmonics 
B) Amplitude is viewed as a function of frequency rather than of time 
C) Amplitude of each harmonic decreases as the frequency increases 
D) Any or all of the sine or cosine terms may be zero, and there are no restrictions on their amplitudes

Question 7

The carrier is often a(n)_____________.

Accepted Answer

A) sine wave 
B) vector 
C) angular frequency 
D) amplitude modulation 
A) sine wave 
B) vector 
C) angular frequency 
D) amplitude modulation

Question 8

Why would you use Friiss's formula?

Accepted Answer

A) To provide the overall noise effect of a multistage system. 
B) To break down any periodic waveform into a series of sine and/or cosine waves at multiples of the fundamental frequency. 
C) To establish that different users can share bands of frequencies provided that each user was assigned exclusive use of a frequency range within that band. 
D) To show how the construction of a square wave can be seen to be made up of a number of sinusoids. 
A) To provide the overall noise effect of a multistage system. 
B) To break down any periodic waveform into a series of sine and/or cosine waves at multiples of the fundamental frequency. 
C) To establish that different users can share bands of frequencies provided that each user was assigned exclusive use of a frequency range within that band. 
D) To show how the construction of a square wave can be seen to be made up of a number of sinusoids.

Question 9

Electronics as a discipline within the field of physical science emerged from the discovery of __________.

Accepted Answer

A) microwaves 
B) gamma rays 
C) cosmic rays 
D) radio waves 
A) microwaves 
B) gamma rays 
C) cosmic rays 
D) radio waves

Question 10

If you were troubleshooting a piece of equipment and you heard a frying noise,what would this indicate?

Accepted Answer

A) A wire is loose 
B) The power is weakening 
C) A component is about to fail 
D) The equipment has been abused 
A) A wire is loose 
B) The power is weakening 
C) A component is about to fail 
D) The equipment has been abused

Question 11

Which of the following is an essential attribute for being an effective troubleshooter?

Accepted Answer

A) To know the latest trends in noise analysis 
B) To be able to limit the frequency response 
C) To know the conversion from the time to the frequency domain 
D) To be able to isolate faulty components quickly and repair the defective circuit 
A) To know the latest trends in noise analysis 
B) To be able to limit the frequency response 
C) To know the conversion from the time to the frequency domain 
D) To be able to isolate faulty components quickly and repair the defective circuit

Question 12

What two factors limit all communication systems?

Accepted Answer

A) Bandwidth and noise 
B) Bandwidth and frequency 
C) Noise and decibels 
D) Noise and currents 
A) Bandwidth and noise 
B) Bandwidth and frequency 
C) Noise and decibels 
D) Noise and currents

Question 13

The overall noise-intensity versus frequency curves for semiconductor devices would have what type of shape?

Accepted Answer

A) Angular 
B) Square 
C) Bathtub 
D) Uneven 
A) Angular 
B) Square 
C) Bathtub 
D) Uneven

Question 14

What does the noise figure (NF)specify?

Accepted Answer

A) Exactly how noisy a device is 
B) The noise content at a specific point 
C) The paths in which the charge carriers move 
D) The ultimate noise performance 
A) Exactly how noisy a device is 
B) The noise content at a specific point 
C) The paths in which the charge carriers move 
D) The ultimate noise performance

Question 15

Why are bandwidths valuable?

Accepted Answer

A) Waveforms are limited. 
B) Analog signals are digitized. 
C) Wireless channels are impractical. 
D) Frequencies are scarce. 
A) Waveforms are limited. 
B) Analog signals are digitized. 
C) Wireless channels are impractical. 
D) Frequencies are scarce.

Question 16

When troubleshooting,why would you perform voltage and resistance checks?

Accepted Answer

A) To check for signals 
B) To eliminate induced failures 
C) To observe frequency spectra 
D) To isolate defective components 
A) To check for signals 
B) To eliminate induced failures 
C) To observe frequency spectra 
D) To isolate defective components

Question 17

Which of the following pieces of equipment would be considered advanced test equipment?

Accepted Answer

A) Digital multimeter (DMM) 
B) Broadband oscilloscope 
C) Spectrum analyzer 
D) RF generator 
A) Digital multimeter (DMM) 
B) Broadband oscilloscope 
C) Spectrum analyzer 
D) RF generator

Question 18

Which of the following is the most troublesome form of external noise?

Accepted Answer

A) Atmospheric 
B) Human-made 
C) Space 
D) Thermal 
A) Atmospheric 
B) Human-made 
C) Space 
D) Thermal

Question 19

What three ratios do decibels represent?

Accepted Answer

A) Powers, voltages, currents 
B) Powers, voltages, frequencies 
C) Voltages, frequencies, impedances 
D) Logarithms, voltages, currents 
A) Powers, voltages, currents 
B) Powers, voltages, frequencies 
C) Voltages, frequencies, impedances 
D) Logarithms, voltages, currents

Question 20

Electric and magnetic fields both result from voltage potentials and _________.

Accepted Answer

A) Radio frequencies 
B) Audio frequencies 
C) Current flows 
D) Electric charges 
A) Radio frequencies 
B) Audio frequencies 
C) Current flows 
D) Electric charges

____________ consists of a mixture of signals at all frequencies and at randomly occurring amplitudes.

White noise is directly proportional to both temperature and _____________.

You are troubleshooting a piece of equipment and you find that unauthorized modifications may have been performed on the equipment.What type of failure does this situation represent?

The terms Johnson,thermal,and _____ noise may be used interchangeably.

What does the graphical display produced by an oscilloscope represent?

Which of the following defines frequency domain?

The carrier is often a(n)_____________.

Why would you use Friiss's formula?

Electronics as a discipline within the field of physical science emerged from the discovery of __________.

If you were troubleshooting a piece of equipment and you heard a frying noise,what would this indicate?

Which of the following is an essential attribute for being an effective troubleshooter?

What two factors limit all communication systems?

The overall noise-intensity versus frequency curves for semiconductor devices would have what type of shape?

What does the noise figure (NF)specify?

Why are bandwidths valuable?

When troubleshooting,why would you perform voltage and resistance checks?

Which of the following pieces of equipment would be considered advanced test equipment?

Which of the following is the most troublesome form of external noise?

What three ratios do decibels represent?

Electric and magnetic fields both result from voltage potentials and _________.

Amplitude Modulation

Angle Modulation

Communications Circuits

Transmitters

Receivers

Digital Communications Techniques

Digital Modulation and Demodulation

Telephone Networks

Wireless Communications Systems

Computer Communication and the Internet

Transmission Lines

Wave Propagation

Antennas

Waveguides and Radar

Fiber Optics

Filters

Exam 1: Fundamental Communications Concept

____________ consists of a mixture of signals at all frequencies and at randomly occurring amplitudes.

White noise is directly proportional to both temperature and _____________.

You are troubleshooting a piece of equipment and you find that unauthorized modifications may have been performed on the equipment.What type of failure does this situation represent?

The terms Johnson,thermal,and _____ noise may be used interchangeably.

What does the graphical display produced by an oscilloscope represent?

Which of the following defines frequency domain?

The carrier is often a(n)_____________.

Why would you use Friiss's formula?

Electronics as a discipline within the field of physical science emerged from the discovery of __________.

If you were troubleshooting a piece of equipment and you heard a frying noise,what would this indicate?

Which of the following is an essential attribute for being an effective troubleshooter?

What two factors limit all communication systems?

The overall noise-intensity versus frequency curves for semiconductor devices would have what type of shape?

What does the noise figure (NF)specify?

Why are bandwidths valuable?

When troubleshooting,why would you perform voltage and resistance checks?

Which of the following pieces of equipment would be considered advanced test equipment?

Which of the following is the most troublesome form of external noise?

What three ratios do decibels represent?

Electric and magnetic fields both result from voltage potentials and _________.

Amplitude Modulation

Angle Modulation

Communications Circuits

Transmitters

Receivers

Digital Communications Techniques

Digital Modulation and Demodulation

Telephone Networks

Wireless Communications Systems

Computer Communication and the Internet

Transmission Lines

Wave Propagation

Antennas

Waveguides and Radar

Fiber Optics

Filters