Question 3: You as the chief engineer are going to employ a student for an internship. The applicants were asked to measure the power consumption of a system consisting of R, L, and C as the box shown below. Which one(s) of the applicant will you select for the second round of interview. Checkmark (tick) the choices that could be true. P = 1 Q = -10 P = -5 Q = 10 P = 0 Q = -5 P = 10 Q = -1 P = -10 Q = -10 HE R1

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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.