USCG Exam PracticeElectrical fundamentals — DC/AC, motors, distribution
A squirrel-cage induction motor's direction of rotation is reversed by:
- A. Reversing the DC field excitation polarity.
- B. Inserting resistance in the rotor circuit.
- ✓ Swapping any two of the three AC supply leads.Correct
- D. Reducing the applied voltage to reverse slip.
Why C is correct
NEETS Mod. 5 §4-1 states that direction reverses by swapping any two of the three supply leads, which reverses the phase sequence and therefore the direction of the rotating magnetic field. Rotor resistance and field excitation apply to wound-rotor and synchronous motors respectively.
Cited:NEETS Mod. 5 §4-1