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