A load of 240 +j 120 is connected to a source of 240 V with a phase angle of 30°, through a transmission line with an inductive reactance of 60 ohms. A Capacitor bank of a capacitive reactance of 120 ohms is connected in parallel to the load. Total reactive power supplied by the load is: O A. 1920 vars O B. 960 vars O C. 1440 vars O D. None of choices are correct O E. 480 vars

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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.