This question is based on information derived from the Wildi textbook, Electrical Machines, Drives & Power Systems, Chapter 17.
While a synchronous motor is operating, a problem occurs with the power supply feeding excitation current to the machine. The machine continues to operate at synchronous speed despite the fact that there is zero excitation current being fed into the machine.
What is the reason behind this phenomenon?
Please select the most correct answer from the options provided below.

Question

This question is based on information derived from the Wildi textbook, Electrical Machines, Drives & Power Systems, Chapter 17. 
 While a synchronous motor is operating, a problem occurs with the power supply feeding excitation current to the machine. The machine continues to operate at synchronous speed despite the fact that there is zero excitation current being fed into the machine. 
 What is the reason behind this phenomenon? 
 Please select the most correct answer from the options provided below.

Answer

The machine is drawing the reactive power from the three-phase line

Answer

The machine is operating off the residual magnetism of the field poles

Answer

The infinite bus is so powerful, it auto regulates all machinery once synchronized

Answer

The machine is drawing the active power from the three-phase line

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This question is based on information derived from the Wildi textbook, Electrica...

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