When a communications receiver is tuned to a strong signal, the AGC bias is measured and found to be zero. The fault cannot be caused by a/an
Adefective IF stage
Bdefective local oscillator
Cdefective RF stage
Dopen circuit in the AGC's filter capacitor
#142📘 reviewer_appEasy
The term used to refer to the condition where the signals from a very strong station are superimposed on other signals being received.
ACross-modulation interference
BIntermodulation interference
CReceiver quieting
DCapture effect
#143📘 reviewer_appEasy
The limiter stage of an FM receiver.
Abehaves as a low-pass filter
Blimits the amplitude of the IF signal to the required level
Cbehaves as a high-pass filter
Dbehaves as a bandstop filter
#144📘 reviewer_appEasy
Motorboating (low-frequency oscillations) in an amplifier can be stopped by
Agrounding the screen grid
Bconnecting a capacitor between the B+ and lead ground
Cby passing the screen grid resistor with a 0.1 uF capacitor
Dgrounding the plate
#145📘 reviewer_appEasy
An effect in which, the modulation of an unwanted signal is transferred to the desired carrier
ACrossmodulation
Bintermodulation
CModulation mixing
DImage-channel interference
#146📘 reviewer_appEasy
Leads should be kept as short as possible in radio circuit so that
Askin effect is reduced
Bthere is less hysteresis effect
Cthere is less dielectric loss
Dstray coupling is minimized
#147📘 reviewer_appEasy
Neutralization of an RF amplifier stage can be necessary in order to
Aincrease the amplifier's gain
Bprevent the generation of spurious oscillations
Creduce the amplifier's gain
Dreduce the level of the output harmonics
#148📘 reviewer_appEasy
The ability of a communications receiver to perform well in the presence of strong signals outside the band of interest is indicated by what parameter?
ABlocking dynamic range
BNoise figure
CSignal-to-noise ratio
DAudio output
#149📘 reviewer_appEasy
Stages that are common to both AM and FM receivers.
Atuner, local oscillator, detector, AF amplifier
BRF amplifier, mixer, IF amplifier, AF amplifier
Clocal oscillator, RF amplifier, frequency discriminator, detector
Dtuner, IF amp, detector, AF amp
#150📘 reviewer_appEasy
Occurs during CW reception if too narrow filter bandwidth is used in the IF stage of a receiver
AFilter ringing
BUndesired signals will reach the audio stage
COutput-offset overshoot
DCross-modulation distortion
#151📘 reviewer_appEasy
A type of emission is produced when an amplitude modulated transmitter is modulated by a facsimile signal.
AA3F
BF3F
CA3C
DF3C
#152📘 reviewer_appEasy
Type of emission produced when an amplitude modulated transmitter is modulated by a television signal.
AF3F
BA3C
CF3C
DA3F
#153📘 reviewer_appEasy
The result of cross-modulation is that
Athe modulation of an unwanted signal is heard on the desired signal
Ba decrease in modulation level of transmitted signals
Ca receiver quieting
Dof inverting sidebands in the final stage of the amplifier
#154📘 reviewer_appEasy
What is emission F3F?
AAM
BFacsimile
CTelevision
DRTTY
#155📘 reviewer_appEasy
What type of emission is produced when a frequency modulated transmitter is modulated by a facsimile signal?
AF3C
BA3C
CF3F
DA3F
#156📘 reviewer_appEasy
Two AM transmitting antennas are close together. As a result the two modulated signals are mixed in the final RF stage of both transmitters. What is the resultant effect on the other station?
AHarmonic interference
BIntermodulation interference
CSpurious interference
DCrossmodulation interference
#157📘 reviewer_appEasy
The term used to refer to the reduction of receiver gain caused by the signal or a nearby station transmitter in the same frequency band?
AQuieting
BCross-modulation interference
CSquelch gain rollback
DDesensitizing
#158📘 reviewer_appEasy
What is the bandwidth occupied by the carrier, both sidebands and harmonics?
AAuthorized bandwidth
BBandwidth of emission and occupied bandwidth
COperating bandwidth
DAll of these
#159📘 reviewer_appEasy
Noise is primarily
Ahigh-frequency spikes
Blow-frequency variations
Crandom level shifts
Drandom frequency variations
#160📘 reviewer_appEasy
What is the type of interference that can be caused can when several repeaters are close together?
