- (A) will become more
- (B) will become less
- (C) will remain unchanged
- (D) none of the abov
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- (A) decreases with increase in its excitation
- (B) increases with increase in its excitation
- (C) remains unaffected with increase in excitation
- (D) any of the above
- (A) increase in both armature current and power factor angle
- (B) increase in back e.m.f. but decrease in armature current
- (C) increase in both armature current and power factor which is lagging
- (D) increase in torque angle but decrease in back
- (E) m.f.
- (A) induction motor torque in field winding
- (B) induction motor torque in damper winding
- (C) eddy current and hysteresis torque in pole faces
- (D) reHetance motor torque due to saliency of the rotor
- (E) all of the above methods
- (A) remain same
- (B) go down
- (C) improve
- (D) none of the above
- (A) the armature current is maximum
- (B) the armature current is minimum
- (C) the armature current is zero
- (D) none of the above
- (A) 3000 r.p.m.
- (B) 1500 r.p.m.
- (C) 750 r.p.m.
- (D) none of the above
- (A) armature current and field current
- (B) power factor and speed
- (C) field current and speed
- (D) field current and power factor
- (A) By changing the supply frequency
- (B) By interchanging any two phases
- (C) By changing the applied voltage
- (D) By changing the load
- (A) the supply voltage and the back e.m.f.
- (B) magnetising current and back e.m.f.
- (C) the rotating stator flux and rotor poles
- (D) none of the above
