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Which of the following statements associated with field control of dc shunt motors is correct? | |
A. | Speed can be varied below and above the rated speed to any extent. [Wrong Answer] |
B. | Speed can be varied above to any extent and below to a certain extent. [Wrong Answer] |
C. | Speed can be varied above to the extent of satisfactory commutation and below no variation. [Correct Answer] |
D. | Speed can be varied above to the extent of satisfactory commutation and below to any extent. [Wrong Answer] |