Electrical Machines
Armature reaction in a DC machine

 is in direct opposition to the main poles.
 makes an angle with the main pole axis which is load dependent.
 is in the same direction as the main poles.
  makes an angle of 90° with the main pole axis.

ANSWER DOWNLOAD EXAMIANS APP

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
 1 and 4
 3 and 5
 2, 3 and 4

ANSWER DOWNLOAD EXAMIANS APP