Power Electronics
Practical way of obtaining static voltage equalization in series connected SCRs is by the use of

  resistors of the same value across each SCR.
 one resistor in series with each SCR.
 one resistor across the string.
 resistors of different values across each SCR.

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Power Electronics
An SCR is considered to be a semi controlled device because

 it conducts only during one half cycle of an alternating current wave.
 it can be turned ON only during one half cycle of an AC.
 it can be turned OFF but not ON with a gate pulse.
 it can be turned ON but not OFF with a gate pulse.

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