A. d.c. excitation only
B. speed of the motor
C. load on the motor
D. both the speed and rotor flux
A. speed
B. load
C. load angle
D. all of the above
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. mild steel
B. chrome steel
C. alnico
D. stainless steel
A. changing the load
B. changing the supply voltage
C. changing frequency
D. using brakes
A. 30°
B. 60°
C. 90°
D. 180°
A. Universal motor
B. Synchronous motor
C. Induction motor
D. Reluctance motor
A. back e.m.f.
B. armature current
C. power factor
D. torque angle
A. 60 to 70%
B. 75 to 80%
C. 85 to 95%
D. 99 to 99.5%
A. high excitation only
B. low excitation only
C. both A. and (b)
D. none of the above