Final answer:
Hand signals can be used to communicate important information or instructions in industries involving heavy machinery and high-power electric circuits. They can also indicate specific actions or responses, helping to ensure effective communication and safety.
Step-by-step explanation:
Hand signals are commonly used in various industries, including those involving heavy machinery and high-power electric circuits. In these situations, it may be necessary for the operator to be given hand signals by a fellow worker to communicate important information or instructions. For example, if the operator is working in an environment where verbal communication is difficult or dangerous, such as in a noisy factory or when wearing protective gear, hand signals can provide a clear and effective means of communication.
Hand signals can also be used to indicate specific actions or responses. For instance, a hand signal might be used to signal the start or stop of a particular task, to indicate a need for assistance, or to warn of potential dangers or hazards. By using standardized hand signals and gestures, workers can ensure that important messages are conveyed accurately and that everyone understands what actions to take.