Electrical Engineering · Question Bank
Communications
408 questions · page 10 of 21. Answer in your head first, then check the solution.
#181
Man-made noise occurs randomly at frequencies up to around
A100 Hz
B300 kHz
C200 MHz
D500 MHz
#182
Space noise contains less energy below
A9 MHz
B15 MHz
C20 MHz
D8 MHz
#183
Its operation involves an exchange of energy between kinetic and potential
AWien-Bridge oscillators
BLC tank circuit
CClapp oscillators
DHartley Oscillators
#184
It is a function of component aging and changes in the ambient temperature and humidity
Ashort-term stability
Bdamping
Clong-term stability
Dfiltering
#185
Which of the ff crystals is commonly used in microphones?
AQuartz
BRochelle salt
CTourmalline
DADP
#186
Which of the ff crystals is often used for frequency control in oscillators?
AEDT
BSynthetic Quartz
CTourmalline
DRochelle Salt
#187
It is an oscillator circuit that generates well-defined, stable waveforms that can be externally modulated or swept over a given frequency range
Aswept generator
Bfrequency synthesizer
Cwave generator
Dfrequency synchronizer
#188
Also known as phase comparator
Aphase detector
Bphase-locked loop
Cvoltage controlled oscillator
Dfrequency synthesizer
#189
It means to form an entity by combining parts or elements
Aoscillate
Bintegrate
Camplify
Dsynthesize
#190
The method of determining the bandwidth requirements for any processing systems is referred to as:
Afrequency spectrum
Bfrequency analysis
Cspectral analysis
Dbandwidth analysis
#191
The kind of noise that is caused by mismatched lines
Aecho noise
Bimpulse noise
Cpartition noise
Dintermodulation noise
#192
What is the reference tone level for RANDOM noise measurement F1A weighted?
A-90 dBm
B-82 dBm
C-67 dBm
D-85 dBm
#193
A widely used balanced modulator is called the
ADiode bridge circuit
BFull-wave bridge rectifier
CLattice modulator
DBalanced bridge modulator
#194
The principal circuit in the popular 1496/1596 IC balanced modulator is a
ADifferential amplifier
BRectifier
CBridge
DConstant current source
#195
In the phasing method used to demodulate a SSB signal is called a(n)
ATransponder
BProduct detector
CConverter
DModulator
#196
Which of the ff can be used as a mixer?
ABalanced modulator
BFET
CDiode detector
DAll of them
#197
The desired output from a mixer is usually selected with a
APhase-shift circuit
BCrystal filter
CResonant circuit
DTransformer
#198
What is the relative amplitude of the third pair of sidebands of an FM signal with m=6?
#199
Which of the ff circuits is NOT typically part of every radio transmitter?
ACarrier oscillator
BDriver amplifier
CMixer
DFinal power amplifier
#200
Class C amplifiers are NOT used in which type of transmitter?
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