Correct option is D
Parasitic Torque:
· This is a torque that arises from various factors such as magnetic losses and is not typically categorized in standard torque definitions. While it can have an effect on performance, it is not a primary torque type that is usually discussed.
Pull-up Torque:
· Pull-up torque is the torque developed by the motor during the acceleration phase from standstill up to the synchronous speed. It ensures that the motor can overcome any initial inertia and maintain its acceleration.
Starting Torque:
· Starting torque is the torque produced when the motor is first energized and is essential for overcoming the load inertia. It is typically higher in motors designed for heavy loads.
Thermal Torque:
· Thermal torque is not a recognized type of torque in the context of induction motors. Instead, thermal aspects relate to heat generated during operation due to losses (like copper and iron losses) and affect the motor's performance and efficiency, but they do not represent a mechanical torque output.
