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 VSWR of transmission line is

 Directly proportional to voltage minimum and inversely proportional to voltage maximum.
 Directly proportional to characteristic impedance and inversely to load impedance.
  Directly proportional to load impedance and inversely to characteristic impedance.
 Proportional to load and characteristic impedance.

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