STUDY NOTES      QUESTIONS WITHOUT 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
   ========= Answer is c =========

    

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
   ========= Answer is a =========

    

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
   ========= Answer is c =========

    

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
   ========= Answer is b =========

    

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
   ========= Answer is d =========

    

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
   ========= Answer is d =========

    

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
   ========= Answer is b =========

    

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
   ========= Answer is c =========

    

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
   ========= Answer is b =========

    

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
    ========= Answer is c =========

     

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
    ========= Answer is a =========

     

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
    ========= Answer is c =========

     

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
    ========= Answer is a =========

     

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
    ========= Answer is b =========

     

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
    ========= Answer is b =========

     

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
    ========= Answer is a =========

     

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
    ========= Answer is d =========

     

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
    ========= Answer is b =========

     

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
    ========= Answer is b =========

     

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
    ========= Answer is c =========