Conducted coupling may affect electronic devices primarily through which two of the following means? (Select two options.)

Question

Options

• AInductive coupling (by magnetic fields)
• BInput signal lines
• COutput signal lines
• DOptical signal lines
• ECapacitive coupling (by electric fields)

• A
  6% (2)
• B
  82% (28)
• D
  3% (1)
• E
  9% (3)

Explanation

Conducted coupling specifically requires a physical electrical path to transmit interference - and input signal lines (B) and output signal lines (C) are exactly those conductive paths through which unwanted electrical noise can enter or exit a device. Any signal line physically connected to a device creates a channel for conducted interference to propagate, making both I/O lines the primary entry and exit points.

Why the distractors are wrong:

• A (Inductive coupling) and E (Capacitive coupling) are mechanisms of radiated coupling - they transfer energy through magnetic or electric fields without a direct conductor, making them the opposite of "conducted."
• D (Optical signal lines) use light through fiber optic cables - no electrical conductor means no conducted path, so they are inherently immune to conducted EMI.

Memory tip: Lock onto the word conducted - it literally means "carried through a conductor." If there's no wire or physical electrical connection involved, it's not conducted coupling. Inductive and capacitive coupling are field-based (radiated), while optical lines have zero conductive path - only I/O signal lines (wires) fit the definition.

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