Throw some light on how DC machines are classified based on excitation? Suppose a separately excited DC generator has an armature resistance of 0.12N and negligible armature inductance. At rated field current and rated rotor speed, its open-circuit voltage is 200 V. When this generator is operated at half the rated speed, with half the rated field current, an un-charged 1000 uF capacitor is suddenly connected across the armature terminals. Assume that the speed remains unchanged during the transient. At what time (in microsecond) after the capacitor is connected will the voltage across it reach 25. Explain in detail?

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Throw some light on how DC machines are classified based on excitation? Suppose a separately
excited DC generator has an armature resistance of 0.12N and negligible armature inductance. At rated
field current and rated rotor speed, its open-circuit voltage is 200 V. When this generator is operated at
half the rated speed, with half the rated field current, an un-charged 1000 µF capacitor is suddenly
connected across the armature terminals. Assume that the speed remains unchanged during the transient.
At what time (in microsecond) after the capacitor is connected will the voltage across it reach 25. Explain
in detail?
Transcribed Image Text:Throw some light on how DC machines are classified based on excitation? Suppose a separately excited DC generator has an armature resistance of 0.12N and negligible armature inductance. At rated field current and rated rotor speed, its open-circuit voltage is 200 V. When this generator is operated at half the rated speed, with half the rated field current, an un-charged 1000 µF capacitor is suddenly connected across the armature terminals. Assume that the speed remains unchanged during the transient. At what time (in microsecond) after the capacitor is connected will the voltage across it reach 25. Explain in detail?
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