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Electrical Machines

Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  Series.
  None of them.
  Compound.
  Shunt.

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Electrical Machines
In a 12 pole triplex lap wound DC armature, each conductor can carry current of 100 A. The rated current of this armature is

 600 A.
 1200 A.
  3600 A.
 2400 A.

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Electrical Machines
When the excitation of normally operating unloaded, salient pole synchronous motor suddenly gets disconnected, it continues to run as a

 induction motor.
 switched reluctance motor.
 DC motor.
 variable reluctance motor.

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 S.Ns
 Zero
 Ns
 Nr

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

None of these
 4.8% and -3.2%
 3.2% and -1.6%
 6% and -4%

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Electrical Machines
The output power of any electrical motor is taken from the

 Motor frame.
 Armature.
 Field.
 Coupling mounted on the shaft.

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