G)GTO can be turned ON by a positive gate current & be turned OFF by a negative gate current at its gate cathode terminals.Turn-off of GTO is achieved by negative gate current IGN such that\(I_g' > \frac{{{I_A}}}{{{\beta _{off}}}}\;\)\({\beta _{off}} = \frac{{{\ALPHA _2}}}{{{\alpha _1} + {\alpha _2} - 1}}\)Where,Ig’ = Negative gate currentIA = Anode currentΒoff = Turn off gainα1 = Current gain of transistor Q1α2 = Current gain of transistor Q2The gate current required to turn off the GTO is relatively HIGH. So the typical turn off gain of GTO is LOW and is in the range of 4 to 5. Due to this large negative current, GTOs are used in low power APPLICATIONS.