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The synchronous motor is operating at UPF. The most suitable phasor will be?
A
B
C
D
A
The correct answer is A. In a synchronous motor operating at unity power factor (UPF), the current phasor is in phase with the voltage phasor, resulting in a power factor of 1.
The correct answer is A. In a synchronous motor operating at unity power factor (UPF), the current phasor is in phase with the voltage phasor, resulting in a power factor of 1.
A synchronous motor operates at UPF when the load is such that the motor's field current aligns perfectly with the armature current. This alignment minimizes power losses and maximizes efficiency, producing a steady torque output.
Synchronous motors can operate at leading, unity, or lagging power factors.
Operating at UPF denotes no reactive power is drawn from the source.
High efficiency at rated load.
Ability to maintain synchronous speed under varying loads.
Complex starting mechanism required.
Lower starting torque compared to induction motors.
Used in applications requiring precise speed regulation.
Commonly found in heavy machinery and power generation.
Synchronous motors are designed to run at constant speed regardless of load.
Option B is incorrect as it typically would skew to a lagging or leading power factor.
A is correct тАФ Operating at unity power factor indicates an ideal condition where reactive power is neither supplied nor absorbed.
For optimal performance in electrical machinery, always consider the power factor as it significantly affects efficiency and system stability.