1- Classify the power switches according to the ability tocontrol

2- What are the conditions of turning on the thyristor. State themethods of turning it off. What is the main difference betweenthyristors and GTO

3- Describe the behavior of TRIAC

4- Derive the expressions of the average load voltage and currentin single-phase half-wave controlled rectifiers and resistive load.Draw the waveforms of supply voltage, output voltage, outputcurrent, thyristor voltage and thyristor current

5- In a single-phase half-wave controlled rectifier and resistiveload, it is desired to get an average load voltage of 80 V.Determine the firing angle if the ac supply voltage is 220 V. Ifthe load resistance is 30 Ω, calculate the average load current anddesign the thyristor. The volt-drop across the device Von duringconduction is 2V. Determine the average conduction losses.

6- In a single-phase half-wave controlled rectifier and R-L load itwas found that conduction angle of the thyristor is 160o when thefiring angle is 50o. Calculate the average load voltage if thecircuit is supplied from a 140 V ac source. Draw the waveforms ofsupply voltage, output voltage, output current and thyristorvoltage.

7- In a single-phase half-wave rectifiers with R-L load and afreewheeling diode FWD, calculate the average load voltage if thefiring angle is 30o and the supply voltage is 150 V. Draw thewaveforms of supply voltage, output voltage, load current,thyristor current, FWD current and thyristor current.

8- Derive the expressions of the average load voltage and currentin single-phase full-wave controlled rectifier with center tappedtransformer and resistive load. Draw the waveforms of supplyvoltage, output voltage, output current, and thyristorcurrent.

9- In a single-phase full-wave controlled rectifier with centertapped transformer and resistive load, it is desired to get anaverage load voltage of 140 V. Determine the firing angle if the acsupply voltage is 200 V. If the average load power is 700 W,calculate the average load current and design the thyristor. Thevolt-drop across each thyristor Von during conduction is 1.8V.Determine the average conduction losses of the thyristors.

10- Derive the expressions of the average load voltage and currentin single-phase full-wave controlled rectifier (bridge rectifier)and resistive load. Draw the waveforms of supply voltage, outputvoltage, output current and thyristor current.

11- In a single-phase full-wave controlled rectifier (bridgerectifier) and resistive load, it is desired to get an average loadvoltage of 50 V. Determine the firing angle if the ac supplyvoltage is 150 V. If the average load power is 300W, calculate theaverage load current and. Design the thyristor.

12- Derive the expressions of the average load voltage insingle-phase full-wave controlled rectifier (bridge rectifier) andhighly inductive load. Draw the waveforms of supply voltage, outputvoltage, output current and thyristor current.

13- In a single-phase full-wave controlled rectifier (bridgerectifier) and resistive load, it is desired to get an average loadvoltage of 90 V. Determine the firing angle if the ac supplyvoltage is 230 V. If the average load power is 270 W, calculate theload current and. Design the thyristor.

14- The single-phase half wave rectifier has a purely resistiveload of R and the delay angle is α=π/2, determine: ??? , ??? ,????, ????.
Plot : Is , Vs , VL , VT , Ig