On a rung, the OTE will energize the output only if which of the following is true?

• A. There is no continuity
• B. There is a complete continuity path from left to right
• C. Output coil is false
• D. Power supply is on

Answer: (B)

The rung energizes the output only when there is a complete path for current from the left power rail to the right output coil. In ladder logic, the OTE will fire when every element in the rung is allowing current to flow (all contacts closed/true and no breaks). If any part of the path is open, the current cannot reach the coil, so the output stays de-energized. Power being on is necessary but not sufficient—the continuity path must exist.