Explanation: The space angle α means that MMF wave at any moment is sinusoidally distributed in space along the air-gap periphery. 5. Three phase voltages are applied to the three windings of an electrical machine. If any two supply terminals are interchanged, then the rotating MMF wave _____________
A. Direction reverses, amplitude alters
B. Direction reverses, amplitude unaltered
C. Direction remains same, amplitude alters
D. Direction remains same, amplitude unaltered
Answer:A
Explanation: The space angle α means that MMF wave at any moment is sinusoidally distributed in space along the air-gap periphery. 5. Three phase voltages are applied to the three windings of an electrical machine. If any two supply terminals are interchanged, then the rotating MMF wave _____________
A. Direction reverses, amplitude alters B. Direction reverses, amplitude unaltered C. Direction remains same, amplitude alters D. Direction remains same, amplitude unaltered
Explanation: The direction of rotating MMF wave is reversed, though its amplitude remains unaltered. 6. The rotating MMF wave of constant amplitude can be produced, only if the time angle displacement between currents is _____________