Question

16. In an FM receiver, the local oscillator always produces a frequency that is above the incoming RF by (a) 10.7 MHz (b) 455 kHz (c) 450MHz (d) 680kHz 17. The detector in an AM receiver (a) detects the difference frequency from the mixer (b) changes the RF to IF (c) recovers the audio signal (d) maintains a constant IF amplitude 18. When a receiver is tuned from one RF frequency to another, (a) the IF changes by an amount equal to the LO (local oscillator) frequency (b) the IF stays the same (c) both the LO and the IF frequencies change (d) none of the above 19. The shape of the AM modulated wave is also refers to as an envelope (a) True (b) False 20. Over modulation is when an excessive intelligence signal overdrives an AM Modulator producing percentage modulation exceeding 100 percent (a) True (b) False 21. In frequency modulation transmission, the peak-to-peak frequency deviation is sometimes called the carrier swing (a) True (b) False 22. In the United States, the FCC limits the frequency deviation for commercial FM Broadcast-band transmitters to \pm75kHz (a) True (b) False 23. The total bandwidth that is allowed for a commercial FM broadcast-band is (a) 60kHz (b) 120kHz (c) 200kHz (d) 80kHz

          16. In an FM receiver, the local oscillator always produces a frequency that is above the
incoming RF by
(a) 10.7 MHz
(b) 455 kHz
(c) 450MHz
(d) 680kHz
17. The detector in an AM receiver
(a) detects the difference frequency from the mixer
(b) changes the RF to IF
(c) recovers the audio signal
(d) maintains a constant IF amplitude
18. When a receiver is tuned from one RF frequency to another,
(a) the IF changes by an amount equal to the LO (local oscillator) frequency
(b) the IF stays the same
(c) both the LO and the IF frequencies change
(d) none of the above
19. The shape of the AM modulated wave is also refers to as an envelope
(a) True
(b) False
20. Over modulation is when an excessive intelligence signal overdrives an AM Modulator
producing percentage modulation exceeding 100 percent
(a) True
(b) False
21. In frequency modulation transmission, the peak-to-peak frequency deviation is
sometimes called the carrier swing
(a) True
(b) False
22. In the United States, the FCC limits the frequency deviation for commercial FM
Broadcast-band transmitters to \pm75kHz
(a) True
(b) False
23. The total bandwidth that is allowed for a commercial FM broadcast-band is
(a) 60kHz
(b) 120kHz
(c) 200kHz
(d) 80kHz

16. In an FM receiver, the local oscillator always produces a frequency that is above the
incoming RF by
(a) 10.7 MHz
(b) 455 kHz
(c) 450MHz
(d) 680kHz
17. The detector in an AM receiver
(a) detects the difference frequency from the mixer
(b) changes the RF to IF
(c) recovers the audio signal
(d) maintains a constant IF amplitude
18. When a receiver is tuned from one RF frequency to another,
(a) the IF changes by an amount equal to the LO (local oscillator) frequency
(b) the IF stays the same
(c) both the LO and the IF frequencies change
(d) none of the above
19. The shape of the AM modulated wave is also refers to as an envelope
(a) True
(b) False
20. Over modulation is when an excessive intelligence signal overdrives an AM Modulator
producing percentage modulation exceeding 100 percent
(a) True
(b) False
21. In frequency modulation transmission, the peak-to-peak frequency deviation is
sometimes called the carrier swing
(a) True
(b) False
22. In the United States, the FCC limits the frequency deviation for commercial FM
Broadcast-band transmitters to ±75kHz
(a) True
(b) False
23. The total bandwidth that is allowed for a commercial FM broadcast-band is
(a) 60kHz
(b) 120kHz
(c) 200kHz
(d) 80kHz

Added by Juan Carlos R.

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