Power Systems
Operator "a" rotates a vector

 either 1 or 2
 anti clock wise direction
 nether 1 nor 2
 clock wise direction

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Power Systems
The modern trend in electric power generation

 to have large size thermal plants near load centre.
 to have large size thermal plant located near coal fields.
 to have large number of small size thermal plants located at different places.
  none of above.

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