loading demo track
Silicon Validation Intern
Write a real answer. It is graded against the question's stored rubric, the mastery movement is computed by the same engine the product uses, and — the part worth watching — the next question is chosen by the real scheduler from what you have already answered. Nothing is saved.
One difference worth stating plainly: scoring here is deterministic rather than model-written, so this page costs nothing to run and cannot be used to burn anyone else's tokens. In a real track the same rubric is graded by the model, which is what produces feedback about your specific reasoning rather than about coverage.
An I2C bus on a test fixture works for hours and then stops responding entirely until the board is power-cycled. SDA is stuck low. What is happening, and how would you both recover and prevent it?