Final answer:
A limit switch is required to prevent the load block from exceeding the safe upper limit of any hoisting mechanism, ensuring safety and preventing equipment failure or accidents, hence the statement is true.
Step-by-step explanation:
The question addresses the issue of safety in hoisting mechanisms and the necessity of limit switches. A limit switch or a similar device is indeed essential to prevent the load block from surpassing the safe upper limit of travel in any hoisting apparatus. This is a safety requirement to avoid potential hazards such as overloading the crane mechanism, which could lead to equipment failure or accidents. Therefore, the statement is True. Similar safety measures are adopted in various engineering applications where movement or stress limits must be strictly controlled to ensure operational safety and integrity.