Physics · Electrical Machines
Which of the following statements is correct for an AC induction machine compared to a DC machine?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1It requires much more frequent maintenance than a DC machine.
- 2The efficiency of an AC motor is always higher than that of a DC motor of the same rating.
- 3Motor speed control can be efficiently achieved by changing the supply frequency.✓
- 4It inherently requires carbon brushes and commutators for its operation.
Correct answer
Motor speed control can be efficiently achieved by changing the supply frequency.
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