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Amplitude modulation: Quiz


Question 1: ________ band used for AM broadcast radio
ShortwaveMedium waveFM broadcastingLongwave

Question 2: Here a small audio stage is used to ________ a low power stage; the output of this stage is then amplified using a linear RF amplifier.
Phase-shift keyingOrthogonal frequency-division multiplexingModulationAmplitude-shift keying

Question 3: Amplitude modulation (AM) is a technique used in electronic communication, most commonly for transmitting information via a ________ carrier wave.
Radio broadcastingAmateur radioRadioMicrowave

Question 4: Types of radio emissions, for the emission types designated by the ________
Universal Postal UnionSwitzerlandUnited NationsInternational Telecommunication Union

Question 5: In 1982, the ________ (ITU) designated the various types of amplitude modulation as follows:
SwitzerlandUnited NationsUniversal Postal UnionInternational Telecommunication Union

Question 6: A simple detector at the transmitter output (which can be little more than a loosely coupled ________) recovers the audio signal, and this is used as negative feedback to the audio modulator stage.
DiodeSemiconductor deviceElectronic componentVacuum tube

Question 7: This approach is widely used in practical medium power transmitters, such as AM ________.
Amateur radioWalkie-talkieTwo-way radioRadiotelephone

Question 8: A wide range of different circuits have been used for AM, but one of the simplest circuits uses anode or collector modulation applied via a ________.
Transformer typesTransformerNikola TeslaInductor

Question 9: In terms of the positive frequencies, the transmission bandwidth of AM is twice the signal's original (________) bandwidth—since both the positive and negative sidebands are shifted up to the carrier frequency.
ModemOrthogonal frequency-division multiplexingModulationBaseband

Question 10: (Contrast this with frequency modulation, also commonly used for sound transmissions, in which the ________ is varied; and phase modulation, often used in remote controls, in which the phase is varied)
HertzOpticsFrequencyElectromagnetic radiation


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