True or False: Motors operating on three-phase are generally more expensive and less efficient than single-phase motors.

Three-phase motors are indeed generally more efficient than single-phase motors due to their design and operational characteristics. They tend to have a more balanced power consumption, which leads to improved performance and reliability.

One of the main reasons for the increased efficiency is that three-phase motors can produce a rotating magnetic field that is more constant and smooth compared to that of single-phase motors. This allows three-phase motors to operate at higher loads without the risk of overheating or energy loss that is more common in single-phase designs.

Regarding the cost, while three-phase motors are usually more expensive upfront due to their complex construction and additional components, their efficiency often leads to lower operational costs over time. Thus, despite the higher initial investment, three-phase motors may provide better long-term value due to reduced energy consumption and maintenance needs.

The statement suggesting that three-phase motors are more expensive and less efficient is incorrect, which is why the answer is false.