25.a. The stray load loss of a wound rotor induction motor can be determined by A. applying a predetermined current to the stator and subtracting the I²R loss from the input power. B. exciting the rotor with a-c voltage and driving it at synchronous speed in the opposite direction. C. driving the rotor in the normal direction by an external power source. D. measuring the total losses and adding the other losses. 25.b. Excitation losses in a transformer must be determined. When running the test, you should make sure that the secondary winding A. is short-circuited B. carries exactly the rated current. C. is open-circuited. D. carries a higher current than the primary

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Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.