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
 3 and 5
 1, 2 and 5
 1 and 4

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Electrical Machines
Short circuit test is performed on a transformer with a certain impressed voltage at rated frequency. If the short circuit test is now performed with the same magnitude of impressed voltage, but at frequency higher than the rated frequency then

 The magnetude of current will increase, but power factor will decrease.
 The magnitude of circuit as well as the power factor will decrease.
 The magnitude will both increase.
 The magnitude of current will decrease but the power factor will increase.

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Electrical Machines
In a DC machine the armature mmf is

  stationary with respect to armature.
  rotating with respect to field poles as well as armature.
 rotating with respect to field poles.
  stationary with respect to field poles.

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