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Electrical Machines

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

 Nr
 S.Ns
 Ns
 Zero

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 200V
 10V
 20V
 100V

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing any two leads from supply.
  transposing all the three leads from the supply.
  transposing any two leads from slip rings.
  disconnecting any one phase.

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 500 rpm
 250 rpm
 1000 rpm
 2000 rpm

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

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Electrical Machines
What is the actual arrangement of series wound generator?

 Armature winding is in series with load.
 Armature and field both are connected.
 Armature and field both are parallel.
  Armature and field both are in series with the load.

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