In which of the following motors the stator and rotor fields rotate simultaneously?

A. become more
B. become less
C. remain constant
D. none of the above

A. 30°
B. 60°
C. 90°
D. 180°

A. damper winding on rotor poles
B. damper winding on stator
C. damper winding on stator as well as rotor poles
D. none of the above

A. a series motor
B. an induction motor
C. an alternator
D. a rotary converter

A. leading
B. lagging
C. unity
D. zero

A. stator supply is relieved of responsibility of producing magnetic field
B. mechanical load on the motor can be adjusted
C. synchronous motor runs at synchronous speed
D. synchronous motor has large air gap