Electrical Engineering · Question Bank

Communications

408 questions · page 11 of 21. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
#201
Bias for a class C amplifier produced by an input RC network is known as
ASignal bias
BSelf bias
CFixed external bias
DTreshold bias
#202
Collector current in a class C amplifier is a
ASine wave
BHalf sine wave
CPulse
DSquare wave
#203
The maximum power of a typical transistor RF power amplifier is in what range?
AMilliwatts
BWatts
CHundred of watts
DKilowatts
#204
Self-oscillation in a transistor amplifier is usually caused by
Aexcessive gain
Bstray inductance
Cinternal capacitance
Dunmatch impedances
#205
Neutralization is the process of
Acancelling the effect of internal device capacitance
Bbypassing undesired alternating current
Creducing gain
Deliminating harmonics
#206
Which of the ff is NOT a benefit of a toroid RF inductor?
ANo shielding required
BFewer truns of wire
CHigher Q
DSelf-supporting
#207
A toroid is a
AType of inductor
BTransformer
CMagnetic core
DCoil holder
#208
Which of the ff is NOT commonly used for impedance matching in a transmitter?
AResistive attenuator
BTransformer
CL network
DT network
#209
Impedance matching in a broadband linear RF amplifier is handled with a(n)
AL network
BParallel tuned circuit
CPi network
DBalun
#210
Which of the ff is NOT a benefit of speech-processing circuits?
AImproved frequency stability
BIncreased average output power
CLimited bandwidth
DPrevention of overmodulation
#211
In a speech-processing circuit, a low-pass filter prevents
AOverdeviation
BOvermodulation
CHigh gain
DExcessive signal bandwidth
#212
The gain of a transistor amplifier is
AInversely proportional to collector current
BDirectly proportional to frequency
CDirectly proportional to collector current
DInversely proportional to frequency
#213
The sensitivity of a receiver depends upon the reciever's overall
ABandwidth
BSelectivity
CNoise response
DGain
#214
The main cause of image interference is
APoor front-end selectivity
BLow gain
CA high IF
DA low S/N ratio
#215
Noise at the input to a receiver can be as high as several
AMicrovolts
BMillivolts
CVolts
DKilovolts
#216
Which filter shape factor represents the best skirt selectivity?
A1.6
B2.1
C5.3
D8
#217
Which input signal below represents the best sensitivity?
A0.5 µV
B1 µV
C1.8 µV
D2 µV
#218
The transistor with the lowest noise figure in the microwave region is a(n)
AMOSFET
BDual-gate MOSFET
CJFET
DMESFET
#219
The AGC circuits usually control the gain of the
AMixer
BDetector
CIF amplifiers
DAudio amplifiers
#220
Selectivity is obtained in most receivers from
ACrystal filters
BMechanical filters
CDouble-tuned circuits
DAudio filters

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