Rotating Machines
7% of exam
Machine types & applications, motor starting, slip, torque.
4 concepts
Exam areas
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Machine types & applications, motor starting, slip, torque.
4 concepts
Master slip, the per-phase equivalent circuit, the 1 : s : (1−s) power-flow ladder, and the torque-slip curve behind every induction-motor exam question.
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Choose and rate rotating machines: synchronous vs induction vs DC, NEMA designs A–D, enclosures, service factor, and the nameplate math the exam rewards.
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How synchronous generators and motors work: equivalent circuit, power-angle equation, V-curves, and excitation as a power-factor knob.
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Locked-rotor current, NEMA code letters, and every reduced-voltage starting method with its exact torque and current trade-offs.
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