Beasley/Electronic Communications
Chapter 1: Fundamental Communications Concept
Multiple Choice Questions
1. What agency in the United States has been given the authority to establish and enforce
regulations regarding the use of radio transmitters and other generators of radio-
frequency energy?
A. Transport and Communications Ministry
B. Federal Communications Commission (FCC)
C. International Telecommunication Union (ITU)
D. Bell Laboratories
2. What three ratios do decibels represent?
A. Powers, voltages, currents
B. Powers, voltages, frequencies
C. Voltages, frequencies, impedances
D. Logarithms, voltages, currents
3. Electric and magnetic fields both result from voltage potentials and .
A. Radio frequencies
B. Audio frequencies
C. Current flows
D. Electric charges
4. The carrier is often a(n) .
A. sine wave
B. vector
C. angular frequency
D. amplitude modulation
5. Electronics as a discipline within the field of physical science emerged from the
discovery of .
A. microwaves
B. gamma rays
C. cosmic rays
D. radio waves
1
,6. What $dxtwo $dxfactors $dxlimit $dxall $dxcommunication $dxsystems?
A. Bandwidth $dxand $dxnoise
B. Bandwidth $dxand $dxfrequency
C. Noise $dxand $dxdecibels
D. Noise $dxand $dxcurrents
7. You $dxare $dxtroubleshooting $dxa $dxpiece $dxof $dxequipment $dxand $dxyou $dxfind $dxthat
$dxunauthorized $dxmodifications $dxmay $dxhave $dxbeen $dxperformed $dxon $dxthe $dxequipment.
$ d x What $dxtype $dxof $dxfailure $dxdoes $dxthis $dxsituation $dxrepresent?
A. Faulty
B. Complete
C. Induced
D. Poor $dxsystem $dxperformance
8. Which $dxof $dxthe $dxfollowing $dxis $dxan $dxessential $dxattribute $dxfor $dxbeing $dxan $dxeffective
$dxtroubleshooter?
A. To $dxknow $dxthe $dxlatest $dxtrends $dxin $dxnoise $dxanalysis
B. To $dxbe $dxable $dxto $dxlimit $dxthe $dxfrequency $dxresponse
C. To $dxknow $dxthe $dxconversion $dxfrom $dxthe $dxtime $dxto $dxthe $dxfrequency $dxdomain
D. To $dxbe $dxable $dxto $dxisolate $dxfaulty $dxcomponents $dxquickly $dxand $dxrepair $dxthe
$dxdefective $dxcircuit
9. Which $dxof $dxthe $dxfollowing $dxis $dxthe $dxmost $dxtroublesome $dxform $dxof $dxexternal $dxnoise?
A. Atmospheric
B. Human-made
C. Space
D. Thermal
10. White $dxnoise $dxis $dxdirectly $dxproportional $dxto $dxboth $dxtemperature $dxand $dx .
A. bandwidth
B. AC $dxvoltage
C. power $dxtransfer
D. frequency
11. The $dxoverall $dxnoise-intensity $dxversus $dxfrequency $dxcurves $dxfor $dxsemiconductor
$dxdevices $dxwould $dxhave $dxwhat $dxtype $dxof $dxshape?
A. Angular
B. Square
C. Bathtub
D. Uneven
2
,12. Which $dxof $dxthe $dxfollowing $dxdid $dxFrench $dxmathematician $dxJean $dxBaptiste $dxJoseph
$dxFourier $dxdevelop?
3
, A. A $dxmeans $dxto $dxbreak $dxdown $dxany $dxperiodic $dxwaveform $dxinto $dxa $dxseries $dxof $dxsine
$dxand/or $dxcosine $dxwaves $dxat $dxmultiples $dxof $dxthe $dxfundamental $dxfrequency.
B. He $dxcreated $dxthermal $dxinteractions $dxbetween $dxfree $dxelectrons $dxand $dxvibrating
$dxions $dxin $dxa $dxconductor.
C. The $dxformula $dxfor $dxcalculating $dxshot $dxnoise $dxcontributed $dxfor $dxa $dxcomplete
$dxtransistor.
D. The $dxrelative $dxmeasure $dxof $dxthe $dxdesired $dxsignal $dxpower $dxto $dxthe $dxnoise $dxpower.
13. Which $dxof $dxthe $dxfollowing $dxpieces $dxof $dxequipment $dxwould $dxbe $dxconsidered
$dxadvanced $dxtest $dxequipment?
A. Digital $dxmultimeter $dx(DMM)
B. Broadband $dxoscilloscope
C. Spectrum $dxanalyzer
D. RF $dxgenerator
14. When $dxtroubleshooting, $dxwhy $dxwould $dxyou $dxperform $dxvoltage $dxand $dxresistance $dxchecks?
A. To $dxcheck $dxfor $dxsignals
B. To $dxeliminate $dxinduced $dxfailures
C. To $dxobserve $dxfrequency $dxspectra
D. To $dxisolate $dxdefective $dxcomponents
15. Why $dxwould $dxyou $dxuse $dxFriiss’s $dxformula?
A. To $dxprovide $dxthe $dxoverall $dxnoise $dxeffect $dxof $dxa $dxmultistage $dxsystem.
B. To $dxbreak $dxdown $dxany $dxperiodic $dxwaveform $dxinto $dxa $dxseries $dxof $dxsine $dxand/or
$dxcosine $dxwaves $dxat $dxmultiples $dxof $dxthe $dxfundamental $dxfrequency.
C. To $dxestablish $dxthat $dxdifferent $dxusers $dxcan $dxshare $dxbands $dxof $dxfrequencies
$dxprovided $dxthat $dxeach $dxuser $dxwas $dxassigned $dxexclusive $dxuse $dxof $dxa $dxfrequency
$dxrange $dxwithin $dxthat $dxband.
D. To $dxshow $dxhow $dxthe $dxconstruction $dxof $dxa $dxsquare $dxwave $dxcan $dxbe $dxseen $dxto
$dxbe $dxmade $dxup $dxof $dxa $dxnumber $dxof $dxsinusoids.
16. What $dxdoes $dxthe $dxgraphical $dxdisplay $dxproduced $dxby $dxan $dxoscilloscope $dxrepresent?
A. Signals $dxin $dxthe $dxfrequency $dxdomain
B. Time-domain $dxrepresentation
C. Amplitude $dxof $dxeach $dxfrequency $dxcomponent
D. Amplitude $dxcharacteristics
17. consists $dxof $dxa $dxmixture $dxof $dxsignals $dxat $dxall $dxfrequencies $dxand
at $dxrandomly $dxoccurring $dxamplitudes.
$dx
A. Decibel $dxunits
B. Frequency
C. Bandwidth
4
Chapter 1: Fundamental Communications Concept
Multiple Choice Questions
1. What agency in the United States has been given the authority to establish and enforce
regulations regarding the use of radio transmitters and other generators of radio-
frequency energy?
A. Transport and Communications Ministry
B. Federal Communications Commission (FCC)
C. International Telecommunication Union (ITU)
D. Bell Laboratories
2. What three ratios do decibels represent?
A. Powers, voltages, currents
B. Powers, voltages, frequencies
C. Voltages, frequencies, impedances
D. Logarithms, voltages, currents
3. Electric and magnetic fields both result from voltage potentials and .
A. Radio frequencies
B. Audio frequencies
C. Current flows
D. Electric charges
4. The carrier is often a(n) .
A. sine wave
B. vector
C. angular frequency
D. amplitude modulation
5. Electronics as a discipline within the field of physical science emerged from the
discovery of .
A. microwaves
B. gamma rays
C. cosmic rays
D. radio waves
1
,6. What $dxtwo $dxfactors $dxlimit $dxall $dxcommunication $dxsystems?
A. Bandwidth $dxand $dxnoise
B. Bandwidth $dxand $dxfrequency
C. Noise $dxand $dxdecibels
D. Noise $dxand $dxcurrents
7. You $dxare $dxtroubleshooting $dxa $dxpiece $dxof $dxequipment $dxand $dxyou $dxfind $dxthat
$dxunauthorized $dxmodifications $dxmay $dxhave $dxbeen $dxperformed $dxon $dxthe $dxequipment.
$ d x What $dxtype $dxof $dxfailure $dxdoes $dxthis $dxsituation $dxrepresent?
A. Faulty
B. Complete
C. Induced
D. Poor $dxsystem $dxperformance
8. Which $dxof $dxthe $dxfollowing $dxis $dxan $dxessential $dxattribute $dxfor $dxbeing $dxan $dxeffective
$dxtroubleshooter?
A. To $dxknow $dxthe $dxlatest $dxtrends $dxin $dxnoise $dxanalysis
B. To $dxbe $dxable $dxto $dxlimit $dxthe $dxfrequency $dxresponse
C. To $dxknow $dxthe $dxconversion $dxfrom $dxthe $dxtime $dxto $dxthe $dxfrequency $dxdomain
D. To $dxbe $dxable $dxto $dxisolate $dxfaulty $dxcomponents $dxquickly $dxand $dxrepair $dxthe
$dxdefective $dxcircuit
9. Which $dxof $dxthe $dxfollowing $dxis $dxthe $dxmost $dxtroublesome $dxform $dxof $dxexternal $dxnoise?
A. Atmospheric
B. Human-made
C. Space
D. Thermal
10. White $dxnoise $dxis $dxdirectly $dxproportional $dxto $dxboth $dxtemperature $dxand $dx .
A. bandwidth
B. AC $dxvoltage
C. power $dxtransfer
D. frequency
11. The $dxoverall $dxnoise-intensity $dxversus $dxfrequency $dxcurves $dxfor $dxsemiconductor
$dxdevices $dxwould $dxhave $dxwhat $dxtype $dxof $dxshape?
A. Angular
B. Square
C. Bathtub
D. Uneven
2
,12. Which $dxof $dxthe $dxfollowing $dxdid $dxFrench $dxmathematician $dxJean $dxBaptiste $dxJoseph
$dxFourier $dxdevelop?
3
, A. A $dxmeans $dxto $dxbreak $dxdown $dxany $dxperiodic $dxwaveform $dxinto $dxa $dxseries $dxof $dxsine
$dxand/or $dxcosine $dxwaves $dxat $dxmultiples $dxof $dxthe $dxfundamental $dxfrequency.
B. He $dxcreated $dxthermal $dxinteractions $dxbetween $dxfree $dxelectrons $dxand $dxvibrating
$dxions $dxin $dxa $dxconductor.
C. The $dxformula $dxfor $dxcalculating $dxshot $dxnoise $dxcontributed $dxfor $dxa $dxcomplete
$dxtransistor.
D. The $dxrelative $dxmeasure $dxof $dxthe $dxdesired $dxsignal $dxpower $dxto $dxthe $dxnoise $dxpower.
13. Which $dxof $dxthe $dxfollowing $dxpieces $dxof $dxequipment $dxwould $dxbe $dxconsidered
$dxadvanced $dxtest $dxequipment?
A. Digital $dxmultimeter $dx(DMM)
B. Broadband $dxoscilloscope
C. Spectrum $dxanalyzer
D. RF $dxgenerator
14. When $dxtroubleshooting, $dxwhy $dxwould $dxyou $dxperform $dxvoltage $dxand $dxresistance $dxchecks?
A. To $dxcheck $dxfor $dxsignals
B. To $dxeliminate $dxinduced $dxfailures
C. To $dxobserve $dxfrequency $dxspectra
D. To $dxisolate $dxdefective $dxcomponents
15. Why $dxwould $dxyou $dxuse $dxFriiss’s $dxformula?
A. To $dxprovide $dxthe $dxoverall $dxnoise $dxeffect $dxof $dxa $dxmultistage $dxsystem.
B. To $dxbreak $dxdown $dxany $dxperiodic $dxwaveform $dxinto $dxa $dxseries $dxof $dxsine $dxand/or
$dxcosine $dxwaves $dxat $dxmultiples $dxof $dxthe $dxfundamental $dxfrequency.
C. To $dxestablish $dxthat $dxdifferent $dxusers $dxcan $dxshare $dxbands $dxof $dxfrequencies
$dxprovided $dxthat $dxeach $dxuser $dxwas $dxassigned $dxexclusive $dxuse $dxof $dxa $dxfrequency
$dxrange $dxwithin $dxthat $dxband.
D. To $dxshow $dxhow $dxthe $dxconstruction $dxof $dxa $dxsquare $dxwave $dxcan $dxbe $dxseen $dxto
$dxbe $dxmade $dxup $dxof $dxa $dxnumber $dxof $dxsinusoids.
16. What $dxdoes $dxthe $dxgraphical $dxdisplay $dxproduced $dxby $dxan $dxoscilloscope $dxrepresent?
A. Signals $dxin $dxthe $dxfrequency $dxdomain
B. Time-domain $dxrepresentation
C. Amplitude $dxof $dxeach $dxfrequency $dxcomponent
D. Amplitude $dxcharacteristics
17. consists $dxof $dxa $dxmixture $dxof $dxsignals $dxat $dxall $dxfrequencies $dxand
at $dxrandomly $dxoccurring $dxamplitudes.
$dx
A. Decibel $dxunits
B. Frequency
C. Bandwidth
4
