Power Systems
Advantages of per unit system is/are

 It has units for all quantities
All of these
 No units for any quantity
 Need of transformation ratio

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Power Systems
Gross head of an hydroelectric power station is

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

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Power Systems
The modern trend in electric power generation

  none of above.
 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.

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