Electrical Machines
In DC generator, full form of MNA is what?

 Magnetic neutral armature co-ordinate.
  Magnetic neutral axis.
 Magnetically no-load armature co-ordinate.
 Magnetic no-load axis.

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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 ?

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

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Electrical Machines
Cogging of induction motor occurs at

 high voltage and when stator and rotor poles are equal.
 low voltage and when stator and rotor poles are not equal.
 high voltage and when stator and rotor poles are not equal.
 low voltage and when stator and rotor poles are equal.

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