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Which of the following statements about universal mctor is incorrect ? | |
A. | Its , direction of rotation can be reversed by reversing the polarity of its power supply [Correct Answer] |
B. | It is designed for commercial frequency ranging from zero to 60 Hz [Wrong Answer] |
C. | It is usually built into the device it drives [Wrong Answer] |
D. | It is built in small size of upto about 0.5 kW [Wrong Answer] |