STUDY NOTES        QUESTIONS WITH ANSWERS 

 
1. In the block diagram of the receiver shown, the "RF amplifier":
   1. decreases random fluctuation noise
   2. is a restoring filter amplifier
   3. increases the incoming signal level
   4. changes the signal frequency
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2. In the block diagram of the receiver shown, the "mixer":
   1. combines signals at two different frequencies to produce one at an intermediate frequency
   2. combines sidebands to produce a stronger signal
   3. discriminates against SSB and AM signals
   4. inserts a carrier wave to produce a true FM signal
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3. In the block diagram of the receiver shown, the output frequency of the "oscillator" is:
   1. the same as that of the incoming received signal
   2. the same as that of the IF frequency
   3. different from both the incoming signal and IF frequencies
   4. at a low audio frequency
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4. In the block diagram of the receiver shown, the "filter" rejects:
   1. AM and RTTY signals
   2. unwanted mixer outputs
   3. noise bursts
   4. broadcast band signals
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5. In the block diagram of the receiver shown, the "IF amplifier" is an:
   1. isolation frequency amplifier
   2. intelligence frequency amplifier
   3. indeterminate frequency amplifier
   4. intermediate frequency amplifier
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6. In the block diagram of the receiver shown, the "product detector":
   1. produces an 800 Hz beat note
   2. separates CW and SSB signals
   3. rejects AM signals
   4. translates signals to audio frequencies
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7. In the block diagram of the receiver shown, the "AF amplifier":
   1. rejects AM and RTTY signals
   2. amplifies audio frequency signals
   3. has a very narrow passband
   4. restores ambiance to the audio
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8. In the block diagram of the receiver shown, the "BFO" stands for:
   1. bad frequency obscurer
   2. basic frequency oscillator
   3. beat frequency oscillator
   4. band filter oscillator
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9. In the block diagram of the receiver shown, most of the receiver gain is in the:
   1. RF amplifier
   2. IF amplifier
   3. AF amplifier
   4. mixer
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10. In the block diagram of the receiver shown, the "RF amplifier":
    1. decreases random fluctuation noise
    2. masks strong noise
    3. should produce little internal noise
    4. changes the signal frequency
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11. In the block diagram of the receiver shown, the "mixer":
    1. changes the signal frequency
    2. rejects SSB and CW signals
    3. protects against receiver overload
    4. limits the noise on the signal
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12. In the receiver shown, when receiving a signal, the output frequency of the "oscillator" is:
    1. the same as that of the signal
    2. the same as that of the IF amplifier
    3. of constant amplitude and frequency
    4. passed through the following filter
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13. In the block diagram of the receiver shown, the "limiter":
    1. limits the signal to a constant amplitude
    2. rejects SSB and CW signals
    3. limits the frequency shift of the signal
    4. limits the phase shift of the signal
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14. In the block diagram of the receiver shown, the "frequency demodulator" could be implemented with a:
    1. product detector
    2. phase-locked loop
    3. full-wave rectifier
    4. low-pass filter
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15. In the block diagram of the receiver shown, the "AF amplifier":
    1. amplifies stereo signals
    2. amplifies speech frequencies
    3. is an audio filtered amplifier
    4. must be fitted with a tone control
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16. In this receiver, an audio frequency gain control would be associated with the block labelled:
    1. AF amplifier
    2. frequency demodulator
    3. speaker, phones
    4. IF amplifier
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17. In the block diagram of the receiver shown, the selectivity would be set by the:
    1. AF amplifier
    2. mixer
    3. limiter
    4. filter
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18. In the FM communications receiver shown in the block diagram, the "filter" bandwidth is typically:
    1. 3 kHz
    2. 10 kHz
    3. 64 kHz
    4. 128 kHz
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19. In the block diagram of the receiver shown, an automatic gain control (AGC) circuit would be associated with the:
    1. mixer
    2. IF amplifier
    3. limiter
    4. frequency demodulator
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20. In the block diagram of the receiver shown, the waveform produced by the "oscillator" would ideally be a:
    1. square wave
    2. pulsed wave
    3. sinewave
    4. hybrid frequency wave
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