Question 289Electricity & Electronics - QMED

The correct answer is D. The feeler will vibrate in synchronism with the 60 Hz AC power source and produce a growling noise when the feeler is moved over a slot containing a shorted coil. This is because a shorted stator coil creates a localized magnetic field that interacts with the alternating current in the feeler, causing it to vibrate and produce a distinctive growling noise. The other options are incorrect because: A) The vibration and noise occur when the feeler is over a shorted coil, not a non-shorted coil. B) An open coil would not produce the same effect as a shorted coil. C) The feeler does not remain motionless when over a shorted coil, but rather vibrates and produces a growling noise.