Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt= Ea– Iara
 Vt = Ea + Iara+ ILrs
 Vt= Ea + Iara
 Vt = Ea + Ia(ra + rs)

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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
 2, 3 and 4
 3 and 5
 1 and 4

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