Electrical Engineering · Question Bank

Communications

386 of 408 questions match · page 3 of 20. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
TypeAll 386Problem solvingObjective 386
DifficultyAll 408Easy 386Medium 22Hard
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#41📘 reviewer_appEasy
At what power level does a 1 kHz tone cause zero interference (144 weighted)?
A90 dB
B90 dBm
C-90 dB
D-90 dBm
#42📘 reviewer_appEasy
Reference noise is ___________.
Aa 1000 Hz, -90 dBm tone
Ba noise that creates the same interfering effect as a 1000 Hz, -90 dBm tone
Ca noise that creates zero dBrn in a voice channel
Dall except a 1000 Hz, -90 dBm tone
#43📘 reviewer_appEasy
A practical dBrn measurement will almost always in a ____________ number.
Apositive
Bnegative
Cimaginary
Dfractional
#44📘 reviewer_appEasy
What is the reference level for noise measurement, F1A weighted?
A-90 dBm
B-82 dBm
C-67 dBm
D-85 dBm
#45📘 reviewer_appEasy
What is the reference tone level for dBa?
A-90 dBm
B-82 dBm
C-67 dBm
D-85 dBm
#46📘 reviewer_appEasy
Indicate the false statement.
AThe noise generated in a resistance or the resistive component of any impedance is random
BRandom noise power is proportional to the bandwidth over which it is measured
CA random voltage across the resistor does not exist
DAll formula referring to a random noise are applicable only to the value of such noise
#47📘 reviewer_appEasy
Noise at the input to a receiver can be as high as several
Amicrovolts
Bmillivolts
Cvolts
Dkilovolts
#48📘 reviewer_appEasy
Noise that occurs via capacitive or inductive coupling in a cable
ACrosstalk
BQuantizing noise
CReference noise
DTone interference
#49📘 reviewer_appEasy
Sources of impulse noise induced in communication channels.
AErroneous digital coding bit caused by an error on a transmission facility
BTransients due to relay operation
CCrosstalk from dc signaling systems
DAll of these
#50📘 reviewer_appEasy
Crosstalks due to incomplete suppression of sidebands or to intermodulation of two or more frequency-multiplexed channels which are unintelligible is classified as
Aimpulse noise
Bthermal noise
Cquantizing noise
Dmiscellaneous noise
#51📘 reviewer_appEasy
The total noise power present in a 1-Hz bandwidth.
ANoise density
BNoise figure
CNoise limit
DNoise intensity
#52📘 reviewer_appEasy
What noise type is observable between 8 MHz to somewhat above 1.43 GHz or up to 1.5 GHz?
ASolar noise
BSpace noise
CGalactic noise
DCosmic noise
#53📘 reviewer_appEasy
Flicker noise is a poorly understood noise which may be completely ignored about above _________
A100 Hz
B200 Hz
C400 Hz
D500 Hz
#54📘 reviewer_appEasy
What noise is a transient short duration disturbance distributed essentially uniformly over the useful passband of a transmission system?
AFlicker noise
BTransit-time noise
CShot noise
DImpulse noise
#55📘 reviewer_appEasy
Phase jitter occurs at what frequency?
Aless than 300 Hz
Bmore than 300 Hz
Cmore than 400 Hz
Dmore than 300 Hz but less than 400 Hz
#56📘 reviewer_appEasy
________ is a multi-channel capacity that is between 1.544 Mbps and 45 Mbps according to the US standards (2.048 Mbps and 34 Mbps according to European)
AWideband
BBaseband
CNarrowband
DBroadband
#57📘 reviewer_appEasy
He hypothesized the existence of magnetic field around a current carrying conductor
AMichael Faraday
BAndre Ampere
CNikola Tesla
DCarl Gauss
#58📘 reviewer_appEasy
A quasi-stationary noise with a finite power spectrum with a finite number of small bands of zero energy dispersed throughout a continous spectrum
Awhite noise
Borange noise
Cviolet noise
Dblue noise
#59📘 reviewer_appEasy
It is also known as differentiated white noise or violet noise
Apink noise
Bgreen noise
Cblue noise
Dpurple noise
#60📘 reviewer_appEasy
What is the urgency signal in radiotelegraphy?
AMAYDAY
BXXX
CSOS
DPANPAN

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