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Electronic Communications Systems Tomasi Chapter 7 And 8

47 Questions  I  By [email protected]
electronic communications systems tomasi chapter 7 and 8
Electronic communications systems subject

  
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1.  In PM, the higher is the peak amplitude of the modulating signal, the higher is the ____
2.  If the modulating signal varies the frequency directly, _____ ______ results
3.  Angle Modulation results whenever the _________ of a sinusoidal wave is varied with respect to time
4.  Amplitude is _____ of modulation depth
5.  ____ indicates how much phase of the carrier is changing with respect to its reference phase.
6.  In angle modulation, _____ bandwidth is needed compared to AM
7.  Standard frequency allocations provide ______ between FM broadcast stations, so there is less adjacent channel interference.
8.  When _____ of a signal is varied, it's phase is also varied
9.  __________ is varying the phase of a constant amplitude carrier directly proportional to the amplitude of the modulation signal at a rate equal to the frequency of the modulating signal
10.  In PM, while the phase of the carrier is changing, its frequency will also be changing. _____ FM will result
11.  In FM, when the carrier signal is modulated by a modulating signal, its instantaneous frequency will change depending on the ______ of the modulating signal
12.  For FM, the radius is limitted more than line of _____
13.  Results whenever the phase angle of a sinusoidal wave is varied with respect to tiime
14.  In PM, when the carrier signal is modulated by a modulating signal, its ________ will change depending on the instantaneous value of the modulating signal voltage.
15.  Standard frequency allocations provide guard band between FM broadcast stations, so there is ____ adjacent channel interference
16.  In PM, when the carrier signal is not modulated, its frequency is constant and is equal to the ________
17.  In PM, the peak phase deviation occurs when the _____ of the modulating signal is at its peak.
18.  In FM, the higher is the modulating signal voltage, the higher is the _____
19.  In PM, the higher is the modulating signal voltage the higher is the ______
20.  In Angle modulation, since reception is limitted in line of sight, the area of reception is much _____ than AM.
21.  Signal to noise ratio can be improved further by increasing the ______ of FM signals
22.  In __, once the signal has been contaminated by noise, noise cannot be removed
23.  Direct frequency modulation is varying the frequency of a ______ amplitude carrier directly proportional to the amplitude of the modulating signal at a rate equal to the frequency of the modulating signal.
24.  In angle modulation, all transmitted power in FM are useful, making it more ______
25.  _______ is varying the frequency of a constant amplitude carrier directly proportional to the amplitude of the modulating signal at a rate equal to the frequency of the modulating signal
26.  In angle modulation, there is ____ complex circuits than in AM
27.  FM has the ability to ______ _____, which is probably the biggest advantage of FM compared to AM
28.  Amplitude of FM and PM remains _____
29.  _____ improves system fidelity
30.  In capture effect, the signals ratio, one of the signals is _____ as high as the other. 
31.  The ______ between frequency and phase modulation lies in which property of the carrier is directly varied by the modulating signal.
32.  Direct frequency modulation is varying the frequency of a constant amplitude carrier _____ ______ to the amplitude of the modulating signal at a rate equal to the frequency of tthe modulating signal.
33.  With FM and PM, a phenomenon known as _____ allows a receiver to differentiate between two signals with the same frequency
34.  For FM broadcasts, ______ is used, so that the radius of operation is limitted slightly more than line of sight
35.  In angle modulation, _____ may be used, but all subsequent can be class C and therefore more power efficient
36.  The two forms of angle modulation are ________ and ________
37.  _____ can be improved further by increasing the frequency deviation of FM signals
38.  Reduced noise improves _____
39.  There is ____ noise in MF and HF than in VHF and UHF
40.  If the modulating signal ______ the frequency directly, frequency modulation results
41.  FM receivers can be fitted with amplitude limiters to remove amplitude variations caused by noise, making FM more immune to noise. This is called __ ________
42.  ____ is the precise phase of the carrier at a given instant of time
43.  FM receivers can be fitted with _____ ______ to remove amplitude variations caused by noise, making FM more immune to noise.
44.  Angle modulated signals are more _________
45.  If the modulating signal varies the phase directly, ___ ____ results.
46.  The difference between frequency and phase modulation lies in which property of the carrier is ____ _____ by the modulating signal
47.  For FM broadcasts, several independent transmitters separated by space can use  the ____ frequency with less possible interference
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