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The most commonly used relay, for the protection of an alternator against loss of excitation, is

1. offset Mho relay.
2. over current relay.
3. differential relay.
4. Buchholz relay.

Correct answer: offset Mho relay.

Solution

The offset Mho relay is specifically designed to detect loss of excitation in alternators by monitoring the impedance of the generator, making it the most effective choice for this protection scenario.

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