Multiple Choice Questions 1.Why isthe capacitor microphone FM generation systemseldom used in practical radio-frequency transmission applications? A.It is inherently unstable. B.It causes the carrier to shift. C.It depends on the amplitude and frequency of the modulating signal. D.It is dependent on system design. 2.The amount by which the oscillator frequency increases and decreases fromis called_________. A.amplitude modulation B.frequency modulation C.frequency deviation D.rest frequency 3.Which of the following is a drawback to direct FM systems? A.Preserving both the amplitude and frequency characteristics of the intelligence. B.Maintaining the frequency stability of the transmitter. C.Narrowband FM systems occupy less bandwidth. D.Modulation index for FM systems is stable. 4.Almost all FM transmissions provide an artificial boost to the electrical amplitude of the higher frequencies. What is this process called? A.Deemphasis B.Capture effect C.Noise suppression D.Preemphasis 5.Why would a lightning strike be a concern for AM radios? A.Frequency and phase modulation are interrelated. B.Bandwidth is twice the highest intelligence frequency. C.AM receiver susceptible to external electrical noise. D.Modulation increases the total transmitted power. 6.Which of the following would be an example a “wideband†FM application? A.Two-way radio B.Oscillator C.Radio transmitter D.Broadcasting 7.What mathematical tool is used to solve for the frequency components of the frequency-modulated signal? A.Bessel function B.Modulation index C.Deviation ratio D.Percentage of modulation 8.______________ occurs when the modulating signal causes the instantaneous carrier phase, rather than its frequency, to shift from its reference value. A.Angular velocity B.Phase shifts C.Phase modulation D.Rest frequency 9.What is the most important advantage of FM over AM? A.FM is completely insensitiveto noise. B.FM has superior noise characteristics. C.PM signal can be made to look like FM. D.Phase modulation (PM) can be used to create FM indirectly. 10.All communications systems are constrained by_____________. A.bandwidthavailability B.reference frequency C.sound waves D.absenceof modulation 1