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True or False
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1
A square wave carrier can be modulated by varying its amplitude, frequency, or phase shift.
A)True
B)False
2
Impressing an information signal on a carrier by changing its frequency produces FM.
A)True
B)False
3
In FM, the carrier amplitude is changed by the modulating signal and the carrier frequency remains constant.
A)True
B)False
4
The frequency of the carrier signal determines the frequency deviation rate.
A)True
B)False
5
Frequency-shift keying is widely used in the transmission of binary data in digital cell phones.
A)True
B)False
6
When the amount of phase shift of a constant-frequency carrier is varied in accordance with a modulating signal, the resulting output is a frequency modulation signal.
A)True
B)False
7
The maximum frequency deviation produced by a phase modulator occurs when the modulating signal is changing at its quickest rate.
A)True
B)False
8
In FM, the frequency deviation is directly proportional to the amplitude of the modulating signal.
A)True
B)False
9
In PM, the carrier frequency deviation is inversely proportional to both the modulating frequency and the amplitude.
A)True
B)False
10
PM is made compatible with FM by passing the intelligence signal through a low-pass RC network.
A)True
B)False
11
A major disadvantage of FM is that it uses much spectrum space.
A)True
B)False
12
The amount of change in carrier frequency produced by the modulating signal is known as the frequency index.
A)True
B)False
13
The FM produced by a phase modulator is called indirect FM.
A)True
B)False
14
In FM, sidebands containing less than 2 percent of the total power have little overall effect on the intelligibility of the signal.
A)True
B)False
15
The symbol ! means factorial.
A)True
B)False





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