Electrical Machines
In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

 shift forward by 90°
 shift forward by less than 90°
 shift forward by more than 90°
 coincide with the GNA

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
An inverted V curve of synchronous motor shows variation of

 power factor and supply voltage during hunting.
  power factor and DC excitation at constant load.
 supply voltage and field current at constant excitation.
 supply voltage and excitation current at constant load.

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Electrical Machines