Power Systems
String efficiency depends upon

 no. of SCR in the string.
  all of these.
 voltage rating of whole string.
 voltage rating of one SCR.

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Power Systems
The advantage of hydro electric power station over thermal power station is

 the operation cost of hydro electric power station is low
 hydro electric power station can supply the power throughout the year
 the initial cost of hydro electric power station is low
 hydro electric station can be constructed at the place where the energy is required

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