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Electrical Machines

Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

 negative.
  zero.
 low.
 positive.

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Electrical Machines
Which of following DC motors will have percentage increase of input current for the same percentage increase in torque?

  Shunt.
 Cummulative compound.
 Differntical compound.
 Series.

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 not changed
None of these
 increase
 decrease

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 The speed of motor.
 The voltage across the terminals.
 The torque required.
 None of above.

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Electrical Machines
A compound motor has

  tertiary winding.
  both shunt and series field winding.
  only shunt field winding.
  only series field winding.

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 1000 rpm, 950 rpm.
 zero, 950 rpm.
 1000 rpm, - 50 rpm.
 zero , - 50 rpm.

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