Discussion
Which of the following represents the correct sequence in ascending order of bandwidth ?
Answer: A
The ascending order is dc amplifier, audio amplifier, radio amplifier, video amplifier.
Bandwidths grow in this order. A dc amplifier is usually meant for slowly varying signals, with a bandwidth from 0 Hz up to a few hundred hertz or kilohertz. An audio amplifier covers about 20 Hz to 20 kHz. A radio-frequency (tuned) amplifier passes a band of the order of tens to hundreds of kilohertz around its carrier. A video amplifier must pass about 0 Hz to several megahertz.
The other options put the video amplifier first or in the middle, or the dc amplifier after the radio amplifier, which does not match these bandwidths.
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