Explanation

(b) Because of their inherent distortion class $C$ amplifiers are never used as audio amplifiers, but they are primarily employed in the final stage of TV transmitters. Also, owing to low efficiency off class $A$ operations, these amplifiers are not employed where large RF (radio frequency) power is involved $eg,$ to excite transmitting antenna. In such cases class $C$ amplifiers are used, since a class $C$ amplifier has a very high efficiency, it can deliver more load power. I output stage of a TV transmitter grid modulated class $C$ amplifier is used.