(i) (ii) Draw the structural diagram of a Gate Turn-Off (GTO) thyristor. [7%] Explain the operation of GTO and clearly state the voltage and frequency range for its application [15%] State four advantages of GTOs when compared to conventional thyristors. (iii) [8%] (b) Consider the single-phase full bridge rectifier shown below where R=6 12, L = 6 mH, E = 60 V and the ac source voltage is 230 V, 50 Hz. * * 13 பண்பு 14* (i) For continuous conduction, find the average value of the output voltage (V.) and average load current (I.) for a firing angle delay 50°. [20 %] In the case that the third thyristor (T3) gets open circuited due to a fault, find the new values of the average output voltage (V.) and average load current (I.). Consider the output current to be continuous and that the firing angle delay is 50°. [30 %] Sketch well-labelled waveforms for the input voltage (vs) and the output voltage (v.) during the period 0 to 37 radians. Indicate the conduction of various thyristors. [20 %] (iii)