Power Systems
Sparse matrix is matrix which contain

 more number of non zeros
 less number of memory elements
 more number of zeros
 more number of memory elements

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Power Systems
Gross head of an hydroelectric power station is

 the height of water level in the river where the tail race is provided.
 the height of water level in the river where the storage is provided.
 all of above.
  the difference of water level between the level in storage and tail race.

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