Which type of loss is primarily attributed to mechanical factors in an induction motor?

The correct answer is friction loss, which is primarily associated with mechanical factors in an induction motor. Friction loss occurs due to the resistance encountered by moving parts of the motor, such as bearings and rotor components, as they interact with each other. This type of loss is directly related to the physical friction generated in the mechanical systems of the motor and is a part of the overall energy efficiency of the motor.

Friction loss can be considered critical when evaluating the performance of an induction motor, especially in terms of heat generation and energy dissipation. It represents the energy that is lost in overcoming the frictional forces within the motor, which, if not managed properly, can lead to reduced efficiency, overheating, and wear over time.

Other types of losses, such as copper loss, are related to electrical factors, specifically the resistance in the windings when current flows through them. Stray power loss involves energy losses that cannot be easily categorized but typically arise from factors such as leakage flux and imperfections in the motor’s magnetic circuit. Dielectric loss occurs in insulating materials due to internal heating, which is unrelated to mechanical friction. Thus, among the options presented, friction loss clearly aligns with mechanical factors affecting the performance of an induction motor.