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Hardware Test Engineering 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.
400 kHz bus, six devices, the device under test is at the far end of a flex cable.
A board's I2C bus hangs during a thermal soak at 85 °C but never at room temperature — the master times out and SDA stays low. It recovers after a power cycle. Where do you look, and how do you tell a physical-layer problem from a software one?