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Whïch of the following is not the advantage of a synchronous motor? | |
A. | High operation efficiency [Wrong Answer] |
B. | Operation over a wide range of power factor-from lagging to leading [Wrong Answer] |
C. | It can always be adjusted to operate at unity power for optimum efficiency and economy [Wrong Answer] |
D. | Its rotor has 2 slip-rings [Correct Answer] |
E. | Operation at constant speed from no-load to full load. [Wrong Answer] |