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- A single-phase bridge rectifier that supplies a very high inductive load such as a de motor is shown in Figure 3.9a. The turns ratio of the transformer is unity. The load is such that the motor draws a ripple-free armature current of I, as shown in Figure 3.9b. Determine (a) the HF of input current and (b) the input PF of the rectifier. Vm -V Fundamental component ot AD, AD, (M of (a) Circuit diagram (b) WaveformsQ5. For the following center tapped transformer, show the waveform across each half of the secondary winding and across Ri, when a 100 V peak sine wave is applied to the primarywinding. What is the PIV rating must the diode have? (Use constant voltage drop model for the Silicon diode) IN4001 Ry OV 10k) D IN4001Devices that pass the signal from its source to the measurement device without aphysical connection by using transformer, optical or capacitive coupling technique arecalled?Select one a. bridgesb. isolatorsc.filters d.rectifiers
- 92) For three - phase half-wave Controlleed rectifier Shown in he figure: 1. Derive a fomu la for mean load Voltage. 2. praw the wave form of vo, i,,i, iy and voltage across thyristor 1 (r.) assuming highly inductive load and d = 120Explain five (5) applications of the hall effects With the aid of a diagram, explain how a P-N Junction is form. iii. State five (5) application of PN Junction, and explain the property of the PN junction that make those application possible. Explain what carrier mobility is and elaborate on the factors that influence carrier mobility. A 80 V rms is stepped down to 18V rms by a transformer. The output from the transformer is rectified using a half wave rectifier circuit and connected to a 47.5 Ω load resistor. Draw a circuit diagram of this arrangement and the waveform at each stage. Calculate the following about the circuit in Figure 2.1 (If silicon diodes are employed in the rectification); the peak value of the output voltage considering the drop across each diode, the average voltage, iii. The current through the load resistor, The current diode, The frequency of the output signal, Calculate the efficiency of the full wave rectifier expressed in percentage. vii. Sketch…1) How is the diode and zener diode in the electronic circuit and how they work?indicate the differences between them.2) Can a zener diode be used instead of a regular diode? please explain.3) Is it to step down and rectify the 220V AC signal by means of a transformer or to convert 220 V?rectify it and then reduce its value to the desired DC level using a voltage divider circuit?suitable.?4) Bridge type full wave rectification with two diodes full wave rectification using a medium ended transformerCompare the rectifier circuit and list its advantages and disadvantages relative to each other.5) What is the concept of PIV (Peak Inverse Voltage) for rectifier circuits?For which rectifier circuits is this value more important?
- Consider a 3-phase half-wave rectifier circuit shown in the figure. The source is a symmetrical, 3-phase four wire system. The line- to-line voltage of the source is 150 V and the supply frequency is 300 Hz. The ripple frequency at the output is R ER B N-1) a) As depicted in the figure, input voltage is 120 Volts (RMS) and diode drops are 0.7 Volts. Design this circuit with given two ac outputs and calculate turns ratio of live transformer. voltage i) 10 V ii) 100 V 2) b) Consider a circuit using Si diodes and 10 k ohms resistors. Design this clipper circuit with output ranges below; i) -0.7 V and above ii) +2.1 V and above iii) +1.4 V c) As given in the figure a clamper circuit with the input +10V- signal Vi is proposed to design. Determine the output voltage with the exact solution step by step. Sketch transfer characteristic Vo versus V₁. V₂ Vo H 2RS -10V- -2√ 01 Vo Trims2. Describe the functions of the following parts in the DC power supply circuit • Transformer: • Bridge rectifier (4 Diodes): I • Capacitors: • Zener diode or Voltage regulator
- Consider the circuit shown in Figure Q7. The full-wave bridge rectifier is supplied from a transformer that has a secondary winding resistance of 52. When conducting, each diode has a forward voltage drop of 0.7 V, regardless of the current carried. D1 D4 240 V rms 50 Hz D2 D3 RL Figure Q7 (a) The transformer has a turn ratio of 10:1. Find the value of the load resistance, RL, if the peak voltage across the load is found to be 20.0 V. (b) For a load resistance of 50 2 and a transformer that gives a peak current in the load of 0.5 A, what is the power dissipated in the load? n:1What are the different integrated circuits? Describe their characteristics, advantages and disadvantages.(b) If such a circuit is to be used to supply an average of 10 V across the load, calculate the turns ratio of the transformer required. The input mains voltage is 240 V rms at 50 Hz. You may assume ideal diodes in your analysis. Note again that there is to be no smoothing of the load voltage.