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WorksheetsRadio Receiver
Total questions: 10
Worksheet time: 6mins
In a superheterodyne receiver, the IF is 455 kHz. If it is tuned to 1200 kHz, the image frequency will be
1655 kHz
2110 kHz
745 kHz
910 kHz
As compared to tuned radio frequency receivers, which of the following is the advantage of using superheterodyne receivers?
High gain and better sensitivity
Better selectivity at high frequencies
Stability
Noise suppression
In a radio receiver, if the intermediate frequency is too low, then
Image-frequency rejection will improve
Selectivity will be too sharp
The frequency selectivity of the local oscillator will have to be lowered
All of the above
In a radio receiver, the local oscillator is tuned to a frequency
lower than the incoming frequency
higher than the incoming frequency
equal to incoming frequency
None of the above
The output of a diode detector contains
D.C. voltage
modulating signal
RF ripple
all of the above
A heterodyne frequency changer is called a
Modulator
Mixer
Demodulator
Frequency translator
In a radio receiver, if the intermediate frequency is too high, then
Selectivity will be poor
Tracking difficulties will be least
Adjacent channel rejection will improve
All of the above will occur
When a superheterodyne receiver is tuned to 455 kHz, its local oscillator provides a mixer with the input at 1010 kHz. The image frequency is
555 kHz
1010 kHz
1465 kHz
A. 1920 kHz
FM receivers using the standard 88 to 108 MHz band use IF of
8 MHz
9.9 MHz
10.7 MHz
12.2 MHz
The purpose of de-emphasis network in FM receiver is to
Limit the amplitude of the modulated carrier
Restore the original amplitude of higher modulating frequencies
Avoid diagonal clipping
Avoid negative peak clipping
