The correct answer is: A. Damage to the starting winding
The centrifugal switch is a safety device that is used to disconnect the starting winding from the motor when the motor reaches a certain speed. If the centrifugal switch does not open at 70 to 80 percent of synchronous speed, the starting winding will continue to be energized, which can cause it to overheat and be damaged.
The starting winding is a type of winding that is used to help the motor start up. It is connected to the motor for a short period of time, usually until the motor reaches a certain speed, and then it is disconnected. The starting winding is usually made of a thinner wire than the running winding, and it is designed to carry a higher current for a short period of time.
If the centrifugal switch does not open at 70 to 80 percent of synchronous speed, the starting winding will continue to be energized. This will cause the starting winding to overheat and be damaged. The starting winding can also cause the motor to overheat and be damaged.
To prevent damage to the starting winding, it is important to make sure that the centrifugal switch opens at 70 to 80 percent of synchronous speed. If the centrifugal switch does not open at 70 to 80 percent of synchronous speed, it is important to have it repaired or replaced.
Here is a brief explanation of each option:
- Option A: Damage to the starting winding. This is the correct answer. If the centrifugal switch does not open at 70 to 80 percent of synchronous speed, the starting winding will continue to be energized, which can cause it to overheat and be damaged.
- Option B: Damage to the centrifugal switch. This is not the correct answer. The centrifugal switch is designed to withstand the high current that is flowing through the starting winding when the motor is starting up. If the centrifugal switch is damaged, it is usually due to a manufacturing defect or a problem with the motor.
- Option C: Overloading of running winding. This is not the correct answer. The running winding is designed to carry the full load of the motor. If the centrifugal switch does not open at 70 to 80 percent of synchronous speed, the starting winding will continue to be energized, but this will not cause the running winding to be overloaded.
- Option D: None of the above. This is not the correct answer. Option A is the correct answer.