The Principal Engineering Technician (Drafting) Passbook® prepares you for your test by allowing you to take practice exams in the subjects you need to study. It provides hundreds of questions and answers in the areas that will likely be covered on your upcoming exam, including but not limited to: Mathematics, estimating, drafting, knowledge of engineering materials; Supervision; Public relations, and Safety; Fundamentals of civil, electrical, and mechanical engineering; and related areas.