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Which of the following motor is not a doubly excited motor?
Induction Motor
DC Motor
Synchronous Motor
All of these
Induction Motor
The correct answer is A (Induction Motor) because an induction motor is not classified as a doubly excited motor. A doubly excited motor has two separate systems that supply power to the magnetic field, which is not the case for induction motors.
The correct answer is A (Induction Motor) because an induction motor is not classified as a doubly excited motor. A doubly excited motor has two separate systems that supply power to the magnetic field, which is not the case for induction motors.
P=10003VIcos(╧Х)тАЛ тАФ Power in an induction motor
╧Д=╧ЙPтАЛ тАФ Torque generated
Induction motors operate based on electromagnetic induction, where a rotating magnetic field induced in the stator causes the rotor to turn. Unlike doubly excited motors such as synchronous motors, which have both stator and rotor windings connected to external power sources, induction motors have a rotor that relies purely on induced current.
Induction motors do not require an external power supply for the rotor, making them simpler and more robust.
They convert electrical energy into mechanical energy through electromagnetic induction.
High reliability and low maintenance due to fewer components.
Lower initial cost compared to doubly excited motors.
Less control over speed compared to synchronous motors.
Lower efficiency at very low speeds.
Used in industrial applications like pumps and fans.
Common in household appliances like washing machines.
Standard performance curve shows torque versus speed characteristics.
Option B (DC Motor) is a singly excited motor, while options C (Synchronous Motor) and D (All of these) include doubly excited types.
A is correct тАФ An Induction Motor operates based on electromagnetic induction and does not possess a separate field winding, which classifies it as not being a doubly excited motor.
Understanding the differences between motor types can significantly enhance your ability to tackle questions on electrical machines in competitive exams.