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Assignment Questions - 14184_215
Assignment Questions - 14184_217

Neets Module 12-Modulation Principles
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16 2-42.   Phase-shift keying is most useful under which of the following code element conditions? 1.   When mark elements are longer than space elements 2.   When mark elements are shorter than space elements 3.   When mark and space elements are the same length 4.   When mark and space elements are longer than synchronizing elements 2-43.   When a carrier is phase-shift keying modulated, (a) a data bit ONE will normally cause the carrier to shift its phase what total number of degrees, and (b) a data bit ZERO will cause the carrier to shift its phase what total number of degrees? 1.   (a)   60 (b)     0 2.   (a)     0 (b) 180 3.   (a) 180 (b) 180 4.   (a) 180 (b)     0 2-44.   Which of the following circuits is used to generate a phase-shift keyed signal? 1.   Logic circuit 2.   Phasor circuit 3.   Phasitron circuit 4.   Longitudinal circuit 2-45.   When a carrier is modulated by a square wave, what maximum number of sideband pairs will be generated? 1. 1 2. 9 3. 3 4.   An infinite number 2-46.   As the square wave modulating voltage is increased to the same amplitude as that of the carrier, what will be the effect on (a) the carrier amplitude and (b) amplitude of the sidebands? 1.   (a) Remains constant (b) Increases 2.   (a) Decreases (b) Increases 3.   (a) Increases (b) Remains constant 4.   (a) Increases (b) Decreases 2-47.   In a square-wave modulated signal, total sideband power is what percentage of the total power? 1.     0 percent 2.   25 percent 3.   33 percent 4.   50 percent Figure 2F.—Waveform. IN ANSWERING QUESTIONS 2-48 THROUGH 2-51, REFER TO FIGURE 2F. SELECT THE FIGURE LETTER THAT CORRESPONDS WITH THE WAVEFORM LISTED IN THE QUESTIONS. LETTERS MAY BE USED ONCE, MORE THAN ONCE, OR NOT AT ALL. 2-48.   Pulse width. 1.   A 2.   B 3.   C 4.   D






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