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Option 4 : Capacitor run type
If we want to improve the power factor, we have to connect the capacitor across the power supply at all time. We know that, in the capacitor run type single phase induction motor, the capacitor is permanently connected with the auxiliary winding. But, this is not happening in any other above mentioned motors. So, the capacitor run type single phase induction motors have highest power factor at full load.
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