Practical Examination: The practical exam is designed to measure a candidate's knowledge in areas such as Working at Heights, Motor and Motor Controls, Alarm Panel Wiring, Installation of a 3-way/4-way Lighting Circuit, and EMT Bending. The agency's network of aviation, ground, rail, and seaport facilities is among the busiest in the country, supports more than 550,000 regional jobs, and generates more than twenty three billion in annual wages and eighty billion in annual economic activity.