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