Operating Engineers Certification Program (OECP) Practice Exam

Three distinct audible signals are listed in ANSI/ASME. In signaling for crane and rigging operations, these three patterns provide clear, mutually understood cues between the operator and the ground crew, helping to coordinate movements even in noisy environments. The standard emphasizes distinguishing signals so commands and statuses are quickly recognizable, and that focus on three patterns is why the correct count is three.