Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Field resistance control.
 Armature circuit resistance control.
 Any of above.
 Armature voltage control.

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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 ?

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

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