Electrical Machines
Consider the following statements regarding the magnetization characteristics of a dc generator : 1. It represents the variation of field flux with field current. 2. Variation of open-circuit terminal voltage with field current is independent of speed 3. It is non-linear from zero to rated field current 4. It helps to determine the critical field resistance at a given speed 5. It always starts from the origin Which of these statements are correct ?

 1, 2 and 5
 2, 3 and 4
 3 and 5
 1 and 4

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In large sized DC machines the compensating windings are provided to

None of these
  neutralize voltage induced in coil due to fluctuation of l
 reduce eddy current losses by providing local short circuits.
 compensate for the decrease in speed due to increase of load.

ANSWER DOWNLOAD EXAMIANS APP