Question 107Electricity & Electronics - Assistant Engineer

The correct answer is C) tapered, long blade, feeler gage. Feeler gages are the best tool to use for measuring the rotor-to-stator air gap in electrical generation equipment. The long, tapered blades of a feeler gage allow you to precisely measure the small clearance between the rotor and stator, which is critical for proper operation of the generator. Other tools like dial indicators or inside micrometers would not be able to access and measure the tight air gap as effectively. The other options are not suitable for this task. A cloth tape measure is not precise enough, and a dial indicator or micrometer would not be able to reach into the tight space between the rotor and stator to take the necessary measurements.