The input voltage to the single-phase to single-phase cycloconverter is 120V(rms), 60Hz.The load resistance is 502 and the load inductance is L= 40 mH. The frequency of the output voltage is 20 Hz. If the converter is operating with a delay angle Up-2n/3, (a) Sketch the cicuit of the converter. (b) Sketch the output voltage waveform, (c) determine the rms value of the output voltage. (d) determine the rms current of the load. (e) determine the input power factor of the converter.

Q4. The source current in the circuit shown is in Figure 3a) What impedance should be connected across terminals a,b for maximum average powertransfer?b) What is the average power transferred to the impedance in (a)?c) Assume that the load is restricted to pure resistance. What size resistor connected across a,bwill result in the maximum average power transferred?d) What is the average power transferred to the resistor in (c)?v

4.) A transformer has a primary coil with 300 windings, and secondary coil has 400 windings. The input AC power supply is 120 volts (Vrms). A) Is this a step-up or step-down transformer? B) What is the rms voltage across the output terminals (Vrms)? C) What is the peak voltage across the output terminals (Vmax)? Primary Secondary imm ac input

The three-phase full-wave converter shown below is used to rectify the three phase (Y-connection) source signals. The six Thyristor are triggered in the sequence shown. Sketch for firing angle (a=90°) the output voltage (Vo), the phase current, the current for any two Thyristor in any one leg, and the load current (Ia). Then calculate (a) Thyristor average and r.m.s current. (b) Supply average and r.m.s current. (c) The normalized average output voltage. (d) The maximum output voltage. [Vdc = [1 - cos(60+ a)] Vml T If the line-to-neutral voltages are defined as 11 T, T T STA T. Load I sin od sin() ex-> Solve the question sin(with your own hands the corresponding line-to-line voltages are √31% sin (out + ) ---√(4)

4) A single-phase full-wave AC voltage controller consists of two SCRs connected in invers-parallel. The supply voltage is 220V at 50Hz. The controller is used to control heater element of 2500W in an electric oven. The trigger angle is 30o. i) Draw the circuit diagram ii) sketch compatible waveforms for the supply, load and SCR voltages. iii) calculate the rms value of the load voltage and current. iv) Determine the input power factor of the circuit. v) Calculate the average value of the SCR current.

A 25 kVA, 2 kV(rms)/100 V(rms) single phase transformer is connected between a 120 V(rms) utility supply and a resistive load. The load current was measured to be 20 A(rms). i. Determine the active power of the load. ii. Determine the primary RMS current. iii. Determine the equivalent resistance of the transformer as seen by the utility supply.