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Why the name pushpull is given to pushpull amplifier?
Because first one side of the amplifier pushes on one half cycle then the other side of the amplifier pulls on the other half of the cycle.
What is A or C biasing?
The three standard forms of analog amplifier biasing are:class A - the amplifier is biased in the center of its linear operating range, this is the most linear but least efficient type of amplifier (because the transistors or tubes are always conducting, even when there is no signal to ampliify).class B - the amplifier is biased at the cutoff point, this is an efficient amplifier but is only linear if operated as a push-pull amplifier (because the transistors or tubes are in cutoff and not conducting when there is no signal and through one half of every cycle, a class B push-pull amplifier has two sections that operate on alternate halves of the cycle).class C - the amplifier is biased in hard cutoff so that only the peaks of the input signal are amplified, this is the most efficient amplifier (because the transistors or tubes may be in cutoff and not conducting for more the 85% of the time) but it is not capable of linear amplification. An amplifier biased as class C is only suitable for use in RF transmitter power stages, where a resonant LC tank circuit will be excited into oscillation by the output of the amplifier and complete the missing parts of the cycle.There are other forms of biasing (e.g. class AB) analog amplifiers that get some of the advantages of two of the standard forms. There are also forms of amplifiers having other nonstandard classes (e.g. class D) that are not analog amplifiers, but instead operate by amplifying pulses.
Can a single diode be connected as a full wave rectifier?
No. The diode conducts during only 1/2 of the cycle, leaving a big hole and no DC where the other half-cycle should be.
The class of amplification in which output current flows only for one half cycle is?
Recalling the class in Dr. Tuma's cave, that's Class B.(I never discarded any of my stone tablets.)
Is it possible to use class c amplifier in FM transmitter?
Technically possible, but not something you want to do. Once the carrier has been AM modulated, you need to handle it tenderly after that. Specifically, distortion has to be prevented, because distortion means new frequencies are introduced into the package, which makes the AM signal wider in occupied bandwidth ANDmakes AM sound terrible. Preventing distortion means the package can only be handled with 'linear' stages, and a Class-C stage is possibly the most non-linear kind of amplifier there is, since it's completely cut off for part of each RF cycle. By the way, this is the reason that AM is normally modulated in the RF power amplifier ... the last stage before the antenna. It would be a lot cheaper and easier to modulate at low level ... where much less audio power would be required ... and then RF-amplify the package for transmission, as is done in FM. But AM is so sensitive to distortion that it takes too much TLC to power-amplify it once it's been modulated. So amplifying (or frequency converting) are generally avoided after AM has been modulated.
