The answer is c.The centrifugal switch is connected in series with the starting winding. The primary function of the centrifugal switch is to produce rotating flux in conjunction with main winding at the time of starting. When the motor has started and reaches nearly 75% of synchronous speed, it produces its own rotating field from the cross field effect. The starting winding now has no function to perform and is removed from the circuit by a centrifugally operated switch.

In a single-phase induction motor, a speed-sensitive centrifugal switch is connected in parallel with the starting winding.

Explanation:

The centrifugal switch is a device used in induction motors to control the starting and running of the motor. It is typically connected in parallel with the starting winding. Let's discuss the reasons behind this.

1. Purpose of the centrifugal switch:
The centrifugal switch is designed to disconnect the starting winding from the power supply once the motor reaches a certain speed. It is used to overcome the high starting current and provide a smooth transition from the starting to the running condition of the motor.

2. Starting winding:
The starting winding in a single-phase induction motor is responsible for generating a rotating magnetic field to start the motor. It is typically connected in series with a start capacitor to improve the starting torque. The starting winding has a high resistance and is designed for high starting current.

3. Connection in parallel:
Connecting the centrifugal switch in parallel with the starting winding allows it to be in the circuit only during the starting period. When the motor is initially powered, both the starting winding and the centrifugal switch are energized. As the motor accelerates, the centrifugal force caused by the rotating rotor causes the switch to open and disconnect the starting winding from the power supply.

4. Advantages:
- By disconnecting the starting winding, the motor can operate more efficiently in the running condition. The starting winding is designed for high current but is not suitable for continuous operation.
- The centrifugal switch eliminates the need for manual switching or additional control devices to disconnect the starting winding.
- It provides a smooth transition from starting to running, reducing the possibility of stalling or overheating.

In conclusion, the speed-sensitive centrifugal switch is connected in parallel with the starting winding in a single-phase induction motor to disconnect the starting winding once the motor reaches a certain speed. This allows for efficient operation and a smooth transition from starting to running condition.

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