Question: ? drives that control AC motor speed by setting motor voltage and frequency are relatively inexpensive and work well for most applications. a . Closed

? drives that control AC motor speed by setting motor voltage and frequency are relatively inexpensive and work well for most applications.
a. Closed-loop vector
b. Inverter
c. Open-loop vector
d. SCR armature-voltage control
? drives that control AC motor speed by setting

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