The selection process may consist of the following: Written Examination: The written examination is designed to test a candidates knowledge in the following areas: ability to diagnose problems in engines, motors, transmissions, brakes, air conditioning systems, hydraulic systems, ignition, and fuel systems; and knowledge of the operating principles of the use of tool/equipment used in the repair/maintenance of vehicles and safety practices. If you indicated having experience performing mechanical maintenance and repairs on diesel, gasoline, and electric powered cars, trucks, buses, construction equipment, or other related vehicles and equipment experience in the previous question, please describe where and how you gained this experience, including names of employers, dates of employment, and duties performed.