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Electrical Machines

Electrical Machines
Example of double excited machine is

 Both are correct.
 DC Shunt Motor
None of these
 Synchronous motor.

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Electrical Machines
If an induction machine is run at above the synchronous speed it acts as

 an induction generator
 a synchronous motor
 an induction motor
None of these

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Electrical Machines
In DC machine yoke offers

 mechanical protection to the machine
 flux path completion
 produce working flux
 both A and B

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Electrical Machines
In a DC Motor 3 point starter is used to

 all of above.
 limit the starting current to a safer value.
 provide protection against Low-Voltage.
 provide overload protection.

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Electrical Machines
To achieve spark less commutation brushes of DC generator are rocked ahead so as to bring them

None of these
 just ahead of magnetic neutral axis.
 just behind the magnetic neutral axis.
 in magnetic neutral axis.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

 0.70 Hz.
 0.75 Hz.
  60 Hz.
  0.65 Hz.

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MORE MCQ ON Electrical Machines

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