Which type of the coupling is mainly used for impedance matching?

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KVS TGT WET (Work Experience Teacher) 8 Jan 2017 Official Paper

Answer 1

The term impedance matching is simply defined as the process of making one impedance look like another
Impedance matching is a process in which the impedance of an electrical load is made equal to the source impedance to maximize the power transfer or minimize signal reflection from the load
The Power amplifiers generally use transformer coupling because the transformer permits impedance matching
The disadvantage of impedance matching is that it gives distorted output