Electronic Communications Systems Tomasi Chapter 7 And 8

47 Questions  I  By [email protected]
Electronic communications systems subject

  
Changes are done, please start the quiz.


Question Excerpt

Removing question excerpt is a premium feature

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


to post comments.

Removing ad is a premium feature

Upgrade and get a lot more done!
Take Another Quiz