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Pregunta 422

What is the purpose of a power supply interlock?

  1. To prevent unauthorized changes to the circuit that would void the manufacturer’s warranty
  2. To shut down the unit if it becomes too hot
  3. To ensure that dangerous voltages are removed if the cabinet is openedRespuesta correcta
  4. To shut off the power supply if too much voltage is produced

Explicación

A power supply cabinet can hold lethal voltages, including charge stored in filter capacitors after the supply is switched off. An interlock is a switch operated by the cover so that opening the enclosure removes the high voltage, typically together with a bleeder that discharges the capacitors.

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Pregunta 422: What is the purpose of a power supply interlock? · FCC General Class (Element 3) · Questena