False Statement: Skewing of motor bars in a squirrel cage induction motor (SCIM) increases starting torque.

Explanation:

1. Introduction:
A squirrel cage induction motor (SCIM) is a type of AC motor widely used in various industrial applications. It consists of a rotor with conductive bars (also known as squirrel cage) and a stator with windings. Skewing of motor bars refers to the angular displacement of the rotor bars from the radial direction.

2. Purpose of Skewing:
The skewing of motor bars in a SCIM serves several purposes, such as reducing cogging, producing more uniform torque, and reducing motor hum during operation. However, it does not increase the starting torque of the motor.

3. Cogging:
Cogging refers to the phenomenon where a motor experiences a jerky or cog-like motion when starting. This is caused by the interaction between the stator slots and the rotor bars. Skewing the rotor bars helps to minimize cogging by altering the interaction between the stator and rotor magnetic fields, resulting in a smoother starting motion.

4. Uniform Torque Production:
Skewing the motor bars also helps in producing more uniform torque throughout the motor's operation. This is achieved by reducing the magnetic locking effect between the stator and rotor. By skewing the rotor bars, the magnetic forces between the stator and rotor become more distributed, resulting in a more evenly distributed torque production.

5. Reduction in Motor Hum:
Additionally, skewing of motor bars helps in reducing motor hum during operation. Motor hum is caused by the interaction between the magnetic fields of the stator and rotor, which can lead to vibrations and noise. Skewing the rotor bars helps to reduce these interactions, resulting in a quieter motor operation.

6. Starting Torque:
Contrary to the false statement, skewing of motor bars does not increase the starting torque of a squirrel cage induction motor. The starting torque is primarily determined by the design of the motor and the characteristics of the rotor bars, such as their shape, size, and material. Skewing the rotor bars does not directly affect these factors and therefore does not increase the starting torque.

Conclusion:
In summary, skewing of motor bars in a squirrel cage induction motor helps in reducing cogging, producing more uniform torque, and reducing motor hum during operation. However, it does not increase the starting torque of the motor.