Medium- and high-power AM modulators typically operate high power efficiency. Select your answer. class B class A class AB class C to achieve
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- p?attempt=155796&cmid%3D80728 Which device allows current to flow in one direction only? Oa. Resistor O b. Diode O c. Semiconductor O d. Transistor Question 16 Not yet answered P Flag question Marked out of 1.00 Diode used to maintain constant output voltage is PN Junction diode O b. Zener diode Ос. Tunnel diode FUJITSU. Give the short answer offollowing questions each question carries equal marks Don’t need tobriefly explain Its better to give point to point answer . (a) How zenerdiode is a special diode (b) Explain the difference between zener and avalanche effect (c) Explain break down voltage (d) Draw the symbol of PN junction diode, tunnel diode , Zener Diode. (e) How collector size is more than emitter (f) How NPN transistor is more good as compare to pnp (g) Why collector have more size than emitter250 200 SCC 150 7.5 100 5.0 50 2.5 25 s0 75 100 125 150 Field excitation, A VOLTAGE REGULATION Open-circuit voltage, Armature short-circuit current,
- Hw@: : A555 IC is Connected 95 slhown in fingune below; fingune Detarmine the range of oscillation finaguerney? Ans: VCC =1Ov 1ok trag. range (621H2 -4.7 kllz 4 7. loke 555 IC 2. CPotentiometa10oke D.olHFA 555 timer configured to run as an astable mode oscillator is shown in Figure 1. If the output is needed to have 30% duty cycle, i) Determine the required value of Rị if R2 = 7kN. ii) Determine the frequency of the output. iii) Draw the charging and discharging phase of capacitor Cext and its relation with the output waveform. ASsume Vcc = 12 V. +Vcc (4) |(8) R1 RESET Vcc (7) DISCH 555 D1 R2 (6) THRESH (3) OUT (2) TRIG (5) CONT GND :Cext 0.01 µF (1) 0.01µF Figure 1Repeat example 35 for FWD and firing angle Fa) 60°. 215 l65 D1985 Example 35: A full wave rectifier used 220V, with firing angle 10° ,total resistance load 5 KQ, inductance 2.34 H,and frequency 60HZ, Draw and calculate: (a) VD.c and Ipc (b) VD.C(Max) (c) Vn (d) Vorms-
- Draw the circuit diagram of a simple voltage regulator.(b) As a communication engineer, you have been asked to design noise signal surge protector device using Schmitt Trigger circuit. Figure Q1(b) shows circuits that has ±12V as power supply. R2 R1 Vref = 2V W Vo Vin Figure Q1(b) (i) Calculate the upper (VUTP) and lower (VLTP) threshold point voltages. Use R1 = 2 k2 and R2 = 12 kQ. (ii) Calculate the hysteresis voltage (VH). (iii) Provide the transfer characteristic diagram. Label the diagram clearly with +Vout, -Vout, VUTP and VLTP Values.Draw the diagram of a Zener regulated full wave power supply circuit. In your own words discuss how the bleeding resistor and Zener diode regulate the DC voltage across the filter capacitor of the power supply circuit.