In the given circuit, the amplitude of the input voltage is 160 Volts RMS and its phase is 35 degrees. The powers given/received by the elements are given below. Accordingly, which of the following is the amplitude (absolute value, modulus) of the equivalent impedance of three parallel loads.      Load 1 = 11 kW and 5 kVAR      Load 2 = forward 7 kVA with 0.7 power factor      Load 3 = 11 kW back with a power factor of 1.0

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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.