Final answer:
The question's correctness is uncertain due to lack of context, but high-voltage wires are held aloft by insulators and the efficiency of simple machines is always less than 100% due to energy loss as heat.
Step-by-step explanation:
The question about the engineer's license and the total horsepower connected to a common header does not seem to correlate with the provided content discussing high-voltage wires and efficiency of simple machines. The requirement for an engineer's license may vary depending on various factors such as jurisdiction, the field of engineering, and the specifics of the engineering tasks involved but generally does not directly relate to the total horsepower connected to a common header. Therefore, without more context, it is difficult to determine the accuracy of the statement.
However, regarding the provided content, the statement about high-voltage wires being held aloft by insulating connectors is true. These connectors prevent the high-voltage wires from touching the towers and ground, which would result in a short circuit. Moreover, high-voltage wires are not typically wrapped in insulating material because they operate in open air where the surrounding air acts as insulation, and enclosing them in material could lead to overheating. Therefore, the correct answer to that statement would be false.
Concerning the efficiency of a simple machine, it is true that the efficiency is always less than 100 percent. No machine can be completely free from friction, and some energy will always be lost as heat. This principle is in accordance with the laws of thermodynamics.