Electric machines (DC suitability): Which motor is NOT suitable for use as a DC machine? Identify the motor type designed for AC induction operation only. Choose the correct option.
Interview
Technology
Difficulty: Easy
Choose an option
-
ASquirrel-cage induction motor
-
BUniversal motor
-
CPermanent-magnet DC motor
-
DSeparately excited DC motor
Answer
Correct Answer: Squirrel-cage induction motor
Explanation
ConceptA squirrel-cage induction motor requires a time-varying AC magnetic field for induction and does not operate as a DC machine. Universal motors can run on AC or DC; PM and separately excited types are DC machines.
Final AnswerSquirrel-cage induction motor