This document contains FAQs on learning to drive and information about variable frequency drives (VFDs). To learn to drive, a candidate should have a B.Tech, diploma, or be pursuing a degree in a relevant engineering field like electrical, electronics, or instrumentation. Alternatively, they can be working in a related field. A VFD is a solid state starter that controls a motor's speed and direction by varying voltage and frequency. It reduces starting voltage and allows changing a motor's direction between forward and reverse. VFDs also measure a motor's voltage, current, frequency, and speed.