Which code represents Positive AC energy for switch repeater relays?

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Multiple Choice

Which code represents Positive AC energy for switch repeater relays?

Explanation:
In signaling energy coding, the letters indicate both the energy type and the circuit function. For switch repeater relays, the code that uses W to denote AC power, p for positive polarity, and the bx suffix to specify the switch repeater circuit uniquely identifies Positive AC energy for that relay type. That combination—Wpbx—explicitly matches positive AC supply for switch repeater relays, which is why it’s the correct choice. The other options either point to different energy types (like DC) or lack the repeater-specific designation, so they don’t fit this purpose.

In signaling energy coding, the letters indicate both the energy type and the circuit function. For switch repeater relays, the code that uses W to denote AC power, p for positive polarity, and the bx suffix to specify the switch repeater circuit uniquely identifies Positive AC energy for that relay type. That combination—Wpbx—explicitly matches positive AC supply for switch repeater relays, which is why it’s the correct choice. The other options either point to different energy types (like DC) or lack the repeater-specific designation, so they don’t fit this purpose.

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