A. It requires more maintenance of commutator and other mechanical devices B. It makes quite a bit of nosie on starting C. In fractional horse power motors, it has replaced the capacitor motors D. It is not easily reversed
A. It revolves synchronously B. It is not subject to any magnetic or mechanical vibrations C. It can be easily manufactured in extremely small sizes of up to 1 w output D. It develops hysteresis torque which is extremely steady both in amplitude and phase
