4. A thyristor that looks like two back-to-back 4 layer diodes is the a. SCR b. Triac c. SCS d. DIAC 15. A device that has an unstable negative resistance region is the a. UJT b. SCS c. TRIAC d. DIAC
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- Problem # 4 In the circuit shown below. Determine the following a. Vs (at the secondary) b. Vout (across RL) c. Vrip (ripple votage) d. VpC e. PIV (Peak Inverse Voltage) 10:1 Dy 1ISV ms Ouiput RL 2.2 k2 D, 50 pF All diodes are IN4001. alleeeConsider the circuit shown in Figure 2. The cut-in voltage of each diode is . Let and assume both diodes are conducting. Determine if this is a valid assumption and explain your answer. And calculate the values of IR, ID, Ip2, and V.. Rj =1.7 kQ ww VB =1 V D1 Dz R2D 4 kQ Figure 2points) For the circuit shown below, sketch to scale the output V, waveform and draw the transfer characteristic (V. versus Vi), Assume the diodes are ideal. V₁ =15-sin wt Zloks www loks # HIF 4V + Vo
- For the rectifier in the figure below, state the conduction sequence of the diodes for periods t1 to tó. D1 D2 D3 22) tl: D. & D.. 23) t2: D. & D.. 24) t3: D. & D.. 25) t4: D. & D.. D4 D5 D6 26) t5: D. &D. 27) t6: D.AN A & D....... Vm cot t6In the circuit shown below. Determine the following a. Vs (at the secondary) b. Vout (across RL) c. Vrip (ripple votage) d. VDC e. PIV (Peak Inverse Voltage) 10:1 Output 115 V mis 60 Hz RL 2.2 k) D, 50μF- All diodes are IN4001. Tund AlMannai EENG261 Page 5/11Consider the circuit with three diodes and a AC input, as shown below: D2 R1 D1 D3 R2 Assume that the input AC voltage is Ttsin(100TTT). You may consider the diodes to be ideal. mean voltage generated across resistor R2 is (assuming current direction to be from AC so into R1, through diode network, and through R2 from top to bottom): O a. 0.5V Ob. -0.5V O c. 1V O d. OV
- Draw the input waveform and output waveform for the circuit given below with proper values marked in the figure. Assume D1 as germanium and D2 as silicon diodes. Input Vpp%3D20V, V1=3 V and V2=10 V. R D2 D1 Vin Vout V1 V2 Maximum voltage of output waveform Minimum voltage of output waveform PsCalculate the current flowing through the given circuit and the voltage value at the V0 ends. (Threshold voltage = 0.3V for Germanium diodes, Threshold voltage for silicon diodes = 0.6V)For the rectifier in the figure below, state the conduction sequence of the diodes for periods t1 to t6. 24) t1: D.....& D.... 25) t2: D.....& D.... 26) t3: D.....& D.... 27) t4: D.....& D.... 28) t5: D.....& D.... 29) t6: D.....& D....
- Suppose we have a 10-V-peak sinusoidal voltage source. Draw the diagram of a circuit that clips off the part of the sinusoid above 5 V and below -4 V. The circuit should be composed of ideal diodes, dc voltage sources, and other components as needed. Be sure to label the terminals across which the clipped output waveform vo(t) appears.Consider the following circuit diagram. Using practical diode model solve the following items. i. What is the type of rectification in this circuit? ii. Calculate the total peak secondary voltage (Note that “RMS" value is given in the circuit) iii. Sketch the plot of time vs voltage over Load (RL) iv. Find the average voltage over Load. v. Find the maximum current passing over diodes. vi. Find the peak inverse voltage (PIV) over the diodes. vii. Find the minimum fuse current rating for the primary coil. 5:1 D DA 120 V rms D3 D2 RL=10kQ RL out ell lelll29. Does an increase in reverse bias for a Varactor diode cause an increase or decrease in capacitance? 30. If the load current through a SCR (Thyristor) reduces to almost zero, what will be the result?