Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  not run.
  continue running in the same direction as before.
  run in a direction opposite to previous one.
  get damaged.

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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

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

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Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

 B is bigger than A for the same current rating
 both are of the same size for the same current rating
 A is bigger than B for the same current rating
 A is bigger than B for the same voltage rating

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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 and 4
 1, 2 and 5
 3 and 5

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