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