حوال .B. Write, if the shown statements are true or false, (Hint: you will lose points for each incorrect answer. If you mark neither "true" nor "false", your points will not be reduced): a) The device which performance as DC-AC conversion can be used for DC and AC motor as a drive. b) MOSFET switches are suitable for high power application. c) In alternative current circuits, SCR turns off as the current tends to change its polarity (natural commutation). d Holding curr ired to Crow the latening current. f) Silicon Controlled Rectifiers are example of JFETs. g) In an ac phase controller, if the firing angle of one thyristor is 30°, then the firing angle of second thyristor is 210. 3 h) A modern power semiconductor device that combines the characteristics of BJT and MOSFET is IGBT. otoristics of the SCR lie in the 2nd & 3rd quadrant

Draw the basic building blocks of the following systems. Explain briefly the operation/function(s) of each block in your system. Recommend probable integrated circuits to be used per operation/function(s) in your system. 1. A system that will monitor and control the level of water in a dam. 2. A system that will switch ON the AC power generator as soon as the main AC source is OFF. Switch OFF the AC power generator when the main AC power is ON.

Select the best answer for the question. 4. Look at the drawing shown in the figure above. When you see this drawing in a schematic diagram, you should recognize that it represents a/an O A. step-up transformer. O B. inverter. C. bridge rectifier. OD. thermal relay.

1. For the ADC0804 used in section 1. the step size can be adjusted by setting the reference voltage on pin 9. When this pin is not connected (as shown in the figure 1 schematic), the reference voltage is the operating voltage Vcc. a) What is the step size for this default setting? b) How can we set the reference voltage on pin 9. to 4 V? c) What would be the step size after changing the reference voltage to 4 V? 2. Determine the analog input that will result in an output code of "10001110". Assume 5 V reference. Show your calculations. 3. What value of the analog input voltage would result in a digital output is 6F (hex)? Assume 4V reference. Show calculations. 4. In section, you used a 8-bit D/A converter. With a reference voltage of 5 V, what voltage does each bit represent in terms of the analog output? Show calculations. 5. For the D/A converter, if the output is 3.62 V, what is the value of the digital input? Show calculations. 6. For the D/A converter circuit shown in Figure 2,…

Ex: 6 :MOSFET Switch Example -Power Dissipation Calculation +VDD Flywheel Diode Л G +Vin ww R D S Lamp Ov Vout Lamp Rating 6 V,24 W and Fully ON RDS on = 0.2 ohm What is PD in MOSFET Switch?

11. DIAC and TRIAC are similar in that both devices. a. Can use breakover voltage b. can be used in ac circuits c. are bidirectional d. all of the above   12. These are semiconductor devices that are primarily used in electronics as electronically controlled switches a. Diodes b. Transistors c. Vacuum Tubes d. Thyristors   13. If an SCR is suspected of not functioning properly, it should be tested a. with power off b. with multimeter set to the diode or high resistance function c. With the SCR leads isolated d. All of the above   14. 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

A DC generator or AC generator with rectifier having the same output voltage produced, which is better? Explain in details.