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Text File  |  1991-07-06  |  12KB  |  314 lines
  1.  
  2.  
  3.          FCC Technician Exam Question Pool - Subelement 3AG
  4.                   (Valid 7/1/90 thru 10/31/92)
  5.  
  6.  
  7.          PRACTICAL CIRCUITS (1 Exam Question)
  8.  
  9.  
  10. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  11.  
  12.  
  13.  
  14. 3G-1-1.1   A
  15. Which frequencies are attenuated by a Low Pass Filter?
  16.  
  17.  A. Those above its Cut Off Frequency.
  18.  B. Those within its Cut Off Frequency.
  19.  C. Those within 50 kHz on either side of its Cut Off Frequency.
  20.  D. Those below its Cut Off Frequency.
  21.  
  22.  
  23. 3G-1-1.2   D
  24. What circuit passes electrical energy below a certain frequency
  25. and attenuates electrical energy above that frequency?
  26.  
  27.  A. A Band-Pass Filter.
  28.  B. A High-Pass Filter.
  29.  C. An Input Filter.
  30.  D. A Low-Pass Filter.
  31.  
  32.  
  33. 3G-1-2.1   C
  34. Why does virtually every modern transmitter have a built-in 
  35. low-pass filter connected to its output?
  36.  
  37.  A. To attenuate frequencies below its cutoff point.
  38.  B. To attenuate low frequency interference to other amateurs.
  39.  C. To attenuate excess harmonic radiation.
  40.  D. To attenuate excess fundamental radiation.
  41.  
  42.  
  43. 3G-1-2.2   B
  44. You believe that excess harmonic radiation from your transmitter 
  45. is causing interference to your television receiver.  
  46. What is one possible solution? 
  47.  
  48.  A. Install a low-pass filter on the television receiver.
  49.  B. Install a low-pass filter at the transmitter output.
  50.  C. Install a high-pass filter on the transmitter output.
  51.  D. Install a band-pass filter on the television receiver.
  52.  
  53.  
  54. 3G-2-1.1   B
  55. What circuit passes electrical energy above a certain frequency
  56. and attenuates electrical energy below that frequency?
  57.  
  58.  A. Band-Pass Filter. 
  59.  B. A High-Pass Filter.
  60.  C. An Input Filter.
  61.  D. A Low-Pass Filter.
  62.  
  63.  
  64. 3G-2-2.1   A
  65. Where is the proper place to install a High Pass Filter?
  66.  
  67.  A. At the antenna terminals of a Television Receiver.
  68.  B. Between a Transmitter and a Transmatch.
  69.  C. Between a Transmatch and the Transmission line.
  70.  D. On a Transmitting Antenna.
  71.  
  72.  
  73. 3G-2-2.2   B
  74. Your Amateur Radio transmissions cause interference to your 
  75. television receiver even though you have installed a low-pass 
  76. filter at the transmitter output.  What is one possible 
  77. solution for this problem?
  78.  
  79.  A. Install a high-pass filter at the transmitter terminals.
  80.  B. Install a high-pass filter at the television antenna terminals.
  81.  C. Install a low-pass filter at the television antenna terminals
  82.     also.
  83.  D. Install a band-pass filter at the television antenna terminals.
  84.  
  85.  
  86. 3G-3-1.1   A
  87. What circuit attenuates electrical energy above 
  88. a certain frequency and below a lower frequency?
  89.  
  90.  A. A Band-Pass Filter.
  91.  B. A High-Pass Filter.
  92.  C. An Input Filter.
  93.  D. A Low-Pass Filter.
  94.  
  95.  
  96. 3G-3-1.2   D
  97. What general range of RF energy does a Band Pass Filter reject?
  98.  
  99.  A. All frequencies above a specified frequency.
  100.  B. All frequencies below a specified frequency.
  101.  C. All frequencies above the upper limit
  102.     of the band in question.
  103.  D. All frequencies above a specified frequency
  104.     and below a lower specified frequency.
  105.  
  106.  
  107. 3G-3-2.1   A
  108. The IF stage of a communications receiver uses a filter with a 
  109. peak response at the intermediate frequency.  What term 
  110. describes this filter response?
  111.  
  112.  A. A band-pass filter.
  113.  B. A high-pass filter.
  114.  C. An input filter.
  115.  D. A low-pass filter.
  116.  
  117.  
  118. 3G-4-1.1   C
  119. What circuit is likely to be found in all types of receivers?
  120.  
  121.  A. An Audio Filter.
  122.  B. A Beat Frequency Oscillator.
  123.  C. A Detector.
  124.  D. An RF Amplifier.
  125.  
  126.  
  127. 3G-4-1.2   D
  128. What type of transmitter does this block diagram represent?
  129.  
  130.                                                  
  131. _________________________________________         Antenna
  132. |     |               |                 |           \|/
  133. |  ___|____       ____|_____       _____|____        |
  134. | |        |      |         |      | Power   |       |
  135. | |  VFO   |----->| Driver  |----->|  Amp    |---->--|
  136. | |________|      |_________|      |_________|
  137. |  ___________      |   ______________   |
  138. |  | Power   |      |  |  Telegraph   |  |
  139. |--| Supply  |      |--|     Key      |--|
  140.    |_________|         |______________|
  141.  
  142.  
  143.  A. A simple packet-radio transmitter.
  144.  B. A simple crystal-controlled transmitter.
  145.  C. A single-sideband transmitter.
  146.  D. A VFO-controlled transmitter.
  147.  
  148.  
  149.  
  150. 3G4-1.3   B
  151. What type of transmitter does this block diagram represent?
  152.  
  153.                                                             \|/ Antenna
  154.                                                              |
  155. ____________       ______________       ______________       |
  156. | Crystal   |      |             |     |  Power       |      |
  157. | Oscillator|----->|  Driver     |---->|              |--->---
  158. |           |      |             |     |   Amp        |
  159. |___________|      |_____________|     |______________|
  160.                        |                        |
  161.                        |                        |  
  162.                        |                        |
  163.                        |    ______________      |
  164.                        |   |  Telegraph   |     |
  165.                        |___|              |_____|
  166.                            |    Key       |
  167.                            |______________|
  168.  
  169.  
  170.  A. A simple packet-radio transmitter.
  171.  B. A simple crystal-controlled transmitter.
  172.  C. A single-sideband transmitter.
  173.  D. A VFO-controlled transmitter.
  174.  
  175.  
  176. 3G-4-1.4   B
  177. What is the unlabeled block (?) in this diagram? 
  178.  
  179. Antenna
  180.  
  181.  \|/  __________     __________      ___________     __________  Speaker
  182.   |  |          |   |          |    |           |   |          |
  183.   |  |  Mixer   |   |    IF    |    |     ?     |   |  Audio   |    /
  184.   |__|          |-->|          |--->|           |-->|          |---|
  185.      |          |   |    Amp   |    |           |   |   AMP    |    \
  186.      |__________|   |__________|    |___________|   |__________|
  187.           ^                               ^
  188.           |                               |
  189.       ____|_____                     _____|_____
  190.      |          |                   |           |
  191.      |   OSC    |                   |   BFO     |
  192.      |          |                   |           |
  193.      |__________|                   |___________|
  194.  
  195.  
  196.  A. An AGC circuit.
  197.  B. A detector.
  198.  C. A power supply.
  199.  D. A VFO circuit.
  200.  
  201.  
  202. 3G-4-1.5   D
  203. What type of device does this block diagram represent?
  204.  
  205.  
  206.  
  207.  
  208.                                                  
  209.  _______________________________________          Antenna
  210. |     |               |                 |           \|/
  211. |  ___|____       ____|_____       _____|____        |
  212. | |        |      |         |      | Power   |       |
  213. | |  vfo   |----->| Driver  |----->|  Amp    |---->--|
  214. | |________|      |_________|      |_________|
  215. |  ___________      |   ______________   |
  216. |  | Power   |      |  |  Telegraph   |  |
  217. |__| Supply  |      |__|     Key      |__|
  218.    |_________|         |______________|
  219.  
  220.  
  221.  A. A double-conversion receiver.
  222.  B. A variable-frequency oscillator.
  223.  C. A simple superheterodyne receiver.
  224.  D. A simple CW transmitter.
  225.  
  226.  
  227.  
  228. 3G-4-2.1   D
  229. What type of device does this block diagram represent?
  230.  
  231.  
  232. \|/ 
  233.  |
  234.  |   ______________        _______________        _______________
  235.  |   |              |      |               |      |               |
  236.  |   |     RF       |      |   MIXER       |      |     WIDE      |
  237.  |-->|    AMP       |----->|               |----->|    FILTER     |---
  238.      |              |      |               |      |               |   |
  239.      |______________|      |_______________|      |_______________|   |
  240.                                   ^                                   |
  241.                                   |                                   |
  242.                                   |                                   |
  243.                            _______|_______                            |
  244.                           |               |                           |
  245.                           |  OSCILLATOR   |                           |
  246.                           |_______________|                           |
  247.                                                                       |
  248.   ---------------------------------<----------------------------------|
  249.  |                                                              
  250.  |    ______________        ________________       ________________ 
  251.  |   |              |      |                |     |                | 
  252.  |   |    IF        |      |  LIMITER       |     |  FREQUENCY     |
  253.  |--->    AMP       |----->|                |---->|  DISCRIMINATOR |---
  254.      |              |      |                |     |                |   |
  255.      |______________|      |________________|     |________________|   |
  256.                                                                        |
  257.                             --------------------<-----------------------
  258.                            |
  259.                            |
  260.                            |    ________________ 
  261.                            |   |                |
  262.                            |   |      AUDIO     |      /
  263.                            |-->|       AMP      |----||  SPEAKER
  264.                                |                |      \
  265.                                |________________|  
  266.  
  267.  
  268.  A. A double-conversion receiver.
  269.  B. A variable-frequency oscillator.
  270.  C. A simple superheterodyne receiver.
  271.  D. A simple FM receiver.
  272.  
  273.  
  274.  
  275. 3G4-2.2   C
  276. What is the unlabeled block (?) in this diagram?
  277.  
  278.  
  279.  
  280.  
  281.  MIC   ______________        _______________        _______________
  282.       |              |      |               |      |               |
  283.  \    |   AUDIO      |      |   CLIPPER     |      |               |
  284.   |-->|    AMP       |----->|   FILTER      |----->|      ?        |---
  285.  /    |              |      |               |      |               |   |
  286.       |______________|      |_______________|      |_______________|   |
  287.                                                            ^           |
  288.                                                            |           |
  289.                                                     _______|_______    |
  290.                                                    |    CRYSTAL    |   |
  291.                                                    |  OSCILLATOR   |   |
  292.                                                    |_______________|   |
  293.                                                                        |
  294.                                                                        |
  295.  -----------------------------------<----------------------------------|
  296.  |
  297.  |
  298.  |                                                                   Antenna 
  299.  |    ______________        ________________       ________________   \|/
  300.  |   |              |      |                |     |                |   | 
  301.  |   |              |      |                |     |      POWER     |   |
  302.  |--->  MULTIPLIER  |----->|  MULTIPLIER    |---->|       AMP      |---
  303.      |              |      |                |     |                |   
  304.      |______________|      |________________|     |________________|   
  305.                                                                        
  306.  
  307.  A. A band-pass filter.
  308.  B. A crystal oscillator.
  309.  C. A reactance modulator.
  310.  D. A rectifier modulator.
  311.  
  312.  
  313.  
  314. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *