Electronic Communications Systems Tomasi Chapter 7 And 8

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Electronic communications systems subject

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