Electronic Communications Systems Tomasi Chapter 7 And 8

47 Questions  I  By [email protected] on October 5, 2012
Electronic communications systems subject

  

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