c) When considering thyristor switching why is In-line fuse protection needed ? d) Why is it common practice to place a capacitor across the output terminals of the rectifier and in parallel with the load ?
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- What is mean by phase angle control method?. Differentiate Natural and forced commutation method. Is it possible to construct rectifier circuits by MOSFET? Justify. ( short anser only plases )i) Draw the circuit diagram of the single phase full wave controlled rectifier (RL load) with center-tapped transformer and compare its performance with uncontrolled rectifier operation. (ii) A single phase fully controlled bridge rectifier circuit has DC output voltage 175 V for an AC supply voltage of 210 V rms. Find the firing angle delay of the circuit for the following cases (a) Converter mode (b) Inverter modeDetermine the peak output voltage for the bridge rectifier in this figure. Assuming the practical model, The transformer is specified to have a 12 V rms secondary voltage for the standard 110 V across the primary. (2nd Approximation)
- (i) With necessary sketch, write the load current flow path of a single phase semi converter during freewheeling period. Assume the load have resistance and high inductance value and the semi converter requires multiple gate pulse for triggering. (i) Draw the circuit diagram of the single phase half wave controlled rectifier (RL load) with center-tapped transformer and compare its performance with uncontrolled rectifier operation.4- What is the effect of adding capacitor in parallel to the load at the rectifier output? Note: Please do not handwriting and write the answer brieflyA 3.3-V, 30-A dc power supply is to be designed with a ripple of less than1.5percent. Assume that a half-wave rectifier circuit (60 Hz) with a capacitor filter is used. (a) What is the size of the filter capacitor C? (b)What is the PIV rating for the diode? (c)What is the rms value of the transformer voltage needed for the rectifier?(d) What is the value of the peak repetitive diode current in the diode? (e) What is the surge current at t =0+?
- Answer in Sentence/Paragraph form. Maximum of 5 sentences each. Lesson: Electronics: HALF-WAVE Rectifier with and without Filter1. What is the function of the filters?2. What is TUF or Transformer Utilization factor? 3. What is the average value of output voltage for half-wave rectifier? 4. What is the peak factor?A 2500-V, 2-A, dc power supply is to be designed with a ripple voltage ≤ 0.5 percent. Assume that a half-wave rectifier circuit (60 Hz) with a capacitor filter is used. (a) What is the size of the filter capacitor C? (b) What is the minimum PIV rating for the diode? (c) What is the rms value of the transformer voltage needed for the rectifier? (d) What is the peak value of the repetitive current in the diode? (e) What is the surge current at t =0+?Discuss the advantages and disadvantages of all rectifier circuits :
- 1) Explain the Voltmeter PMMC instrument and the Ammeter PMMC instrument in AC?2) What are the benefits of using an Auto Transformer instrument in AC?Comparing the performance with controlled rectifier circuit which one of the following statement is correct for DC -DC chopper ? a. Switching frequency is not responsible for output ripples b. small filters are required c. Regenerative braking process is very slow d. Efficiency is poor in chopper circuita half-wave rectifier circuit in the figure below has a transformer inserted between the source and the remainder of the circuit. The source is 240 Vrms at 60 Hz, and the load resistor is 20 ohm. (a) Determine the required transformer turns ratio (Ns/Np) so that the average load current is 12 A. (b) Determine the average current in the primary winding of the transformer.