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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

  DC series.
 Induction motor.
 DC shunt.
 DC compound.

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Electrical Machines
A single phase, 2 KV alternator has an armature resistance of 0.8 ohms and 4.94 ohms respectively. The voltage regulation of the alternator at 100 a load 0.8 loading power factor is

  8.9%.
 14%.
 7%.
 0%.

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Electrical Machines
What does happen if tripled harmonics given to induction motor?

  Will results in short circuit.
  Fail to start.
  Will results in open circuit.
  Nothing will happen.

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

 50 Hz
 48.5 Hz
 48 Hz
 45 HZ

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Electrical Machines
A synchorous generator connected to an infinite bus is over excited. Considering only the reactive power from the point view of the system the machine acts as

 A resistor.
 A capacitor.
 an inductor.
  None of these.

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

  190 A.
 173 A.
 240 A.
 127 A.

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