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Here are the full forms for the abbreviations:

FDMA: Frequency Division Multiple Access
TDMA: Time Division Multiple Access
CDMA: Code Division Multiple Access
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1. As the Q-point is at the mid of the load line so during the whole cycle the amplifier remains in the operational mode and whole waveform is amplified.

2. Class C Amplifier A Class C amplifier is defined as an amplifier where the transistor conducts for less than half of the input cycle. Specifically: It is biased so that the transistor operates in cutoff for most of the input cycle, except during a narrow portion near the peak of the input waveform. Class C amplifiers are highly efficient but produce significant distortion and are typically used in applications where high efficiency is prioritized over fidelity, such as RF (radio frequency) amplification.