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Electrical Machines

Electrical Machines
Quadrature axis synchronous reactance is the ratio of

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

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using transformer oil of better quality.
 increasing the number of turns.
 using the magnetic core of low reluctance.
 using soft material for winding.

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Around 100 %.
 Around 90 %
 Less than 50 %
 Any where between 75 % and 90 %.

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

 GNA
None of these
 either GNA or MNA
 MNA

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

 48.5 Hz
 45 HZ
 50 Hz
 48 Hz

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

  cogging.
  skewing.
  slip.
  crawling.

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