The correct answer is: B. 80% to 90%.
Shaded pole motors are a type of single-phase induction motor that is used in a variety of applications, including fans, pumps, and blowers. They are relatively simple and inexpensive to manufacture, and they have a good power-to-weight ratio. However, they are also relatively inefficient, with typical efficiencies ranging from 80% to 90%.
The efficiency of a motor is a measure of how much of the electrical energy it consumes is converted into mechanical energy. The remaining energy is lost as heat. The efficiency of a motor is affected by a number of factors, including the design of the motor, the quality of the materials used, and the operating conditions.
In general, shaded pole motors are not as efficient as other types of motors, such as three-phase induction motors. However, they are still a good choice for many applications where efficiency is not the primary concern.
Here is a brief explanation of each option:
- Option A: 95% to 99%. This is the range of efficiency for some high-efficiency motors. However, shaded pole motors are not typically this efficient.
- Option B: 80% to 90%. This is the range of efficiency for most shaded pole motors.
- Option C: 50% to 75%. This is the range of efficiency for some less efficient motors. However, shaded pole motors are typically more efficient than this.
- Option D: 5% to 35%. This is the range of efficiency for some very inefficient motors. However, shaded pole motors are typically more efficient than this.