- (A) decrease both armature current and power factor
- (B) decrease armature current but increase power factor
- (C) increase armature current but decrease power factor
- (D) increase both its armature current and power factor
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- (A) windage friction
- (B) variable load
- (C) variable frequency
- (D) variable supply voltage
- (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
