Assignment:
A single phase electric motor has an output power of 10 kW and an efficiency of 90% at full load. The motor is fed from a 240 V supply via a cable that has a resistance of 10 milli ohms per metre length. If the terminal voltage to the motor must not fall below 90% of the supply voltage, calculate the maximum return length of the cable for a motor power factor of:
A. Unity
B. 0.8 (sketch a circuit diagram and phasor diagram, the motor and line voltages are no longer in phase)
C. The power dissipated in the cable for each of the above two cases.
Provide complete and step by step solution for the question and show calculations and use formulas.