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Electrical Machines

Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  crawling.
  slip.
  cogging.
  skewing.

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Reversing supply connection.
 Interchanging armature and field connection.
 Adding resistance to field circuit.
 Reversing armature connection or field connection.

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Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

 remain the same
 increase
 become zero
 decrease

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmin to Imin
 Vmin to Imax
 Vmax to Imax
 Vmax to Imin

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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
Lap winding is prefered for which type of machines?

 high current and high voltage
 low current and high voltage
 low current and low voltage
 high current and low voltage

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