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.Management Sciences
Category: Modulation and Demodulation
The diode detector in an AM radio receiver is usually found _____________?
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A. Before the first RF stage
B. After the first RF stage
C. After several stages of amplification
D. None of the above
In a transmitter ____________oscillator is used?
A. Hartley
B. RC phase-shift
C. Wien-bridge
D. Crystal
A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor ?
A. 3
B. 6
C. 5
D. None of the above
In a TRF radio receiver, the RF and detection stages are tuned to______________?
A. Radio frequency
B. IF
C. Audio frequency
D. None of the above
Most of the amplification in a superhetrodyne receiver occurs at ______________stage?
A. IF
B. RF amplifier
C. Audio amplifier
D. Detector
The superhetrodyne principle provides selectivity at ______________stage?
A. RF
B. IF
C. audio
D. Before RF
If a radio receiver amplifies all the signal frequencies equally well, it is said to have high ________________?
A. Sensitivity
B. Selectivity
C. Distortion
D. Fidelity
When the modulating signal controls the frequency of the carrier, we get______________?
A. Phase modulation
B. Amplitude modulation
C. Frequency modulation
D. May be any one of the above
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