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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 MNA
None of these
 GNA
 either GNA or MNA

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Electrical Machines
An IM cannot run at synchronous speed because

  air friction will prevent it.
  rotor torque will not be produced.
  induction motor will become synchronous motor.
  none of above.

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 synchronizing power co efficient.
 mechanical rotatory system.
  restoring torque.
 damping torque.

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

 Armature current and torque.
 Power factor and field current.
 Torque and field current.
  Armature current and field current.

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Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

 will become leading
 will remain the same
None of these
 will become lagging

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Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

 KhfBm3.
  KhfBm1.6.
 KhfBm.
 Khf2Bm1.6.

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