1. ECE 2660 Final Exam Review Part A- electronics questions Einstein discovers that time is money…….

2. The system is 1.Lowpass 2.Bandpass 3.Highpass 4.None of the above

3. The system is 1.Lowpass 2.Bandpass 3.Highpass 4.None of the above

4. The pass band voltage gain is A.15.5 B.2.0 C.-34 dB D.None of the above

5. The pass band voltage gain is A.15.5 B.2.0 C.-34 dB D.None of the above

8. The schematic, above, is a part of the system that yielded the Bode plot above. A.0.01µF B..002µF C..001µF D.None of the above What is the value of C1 in the schematic that is consistent with the Bode plot?

9. The schematic, above, is a part of the system that yielded the Bode plot above. A.0.01µF B..002µF C..001µF D.None of the above What is the value of C1 in the schematic that is consistent with the Bode plot?

10. Assume that the source resistance of V1 is negligible, β is large, and the circuit is operating at a frequency at which the reactances of C1 and C2 are negligible. R5 = 340 ohms, R6 = 680 ohms, R1 = 680 ohms, R4 = 220 ohms, R3 = 680 ohms, VCC = 20V. What is the approximate voltage gain of this circuit in dB? A.0 dB B.3 dB C.6 dB D.None of the other choices is correct.

11. Assume that the source resistance of V1 is negligible, β is large, and the circuit is operating at a frequency at which the reactances of C1 and C2 are negligible. R5 = 340 ohms, R6 = 680 ohms, R1 = 680 ohms, R4 = 220 ohms, R3 = 680 ohms, VCC = 20V. What is the approximate voltage gain of this circuit in dB? A.0 dB B.3 dB C.6 dB D.None of the other choices is correct.

12. What is the frequency response characteristic of this circuit? A.Low pass B.High pass C.Band pass D.Band reject

13. What is the frequency response characteristic of this circuit? A.Low pass B.High pass C.Band pass D.Band reject

14. What is the approximate value of ICQ, the quiescent collector current? A.6.15 mA B.12.3 mA C.3.07 mA D.None of the other choices is correct.

15. What is the approximate value of ICQ, the quiescent collector current? A.6.15 mA B.12.3 mA C.3.07 mA D.None of the other choices is correct.

16. Suppose that the amplifier and surrounding components were configured such that you were able to calculate the approximate voltage gain as 19 dB and the transistor was operating in the forward active region. Which of the following might represent plausible values of the “true” voltage gain? A.18.7 dB B.19.5 dB C.22.0 dB D.25.0 dB

17. Suppose that the amplifier and surrounding components were configured such that you were able to calculate the approximate voltage gain as 19 dB and the transistor was operating in the forward active region. Which of the following might represent plausible values of the “true” voltage gain? A.18.7 dB B.19.5 dB C.22.0 dB D.25.0 dB

18. Which of the following is true? A.The "exact" voltage gain is not affected by the values of R3 and R4, if the source impedance of V1 is high enough. B.The "exact" voltage gain is affected by all 4 resistors, regardless of the value of VCC if the transistor is operating in the forward active region. C.The "exact" voltage gain is only a function of R6 and R5. D.None of the other choices is correct.

19. Which of the following is true? A.The "exact" voltage gain is not affected by the values of R3 and R4, if the source impedance of V1 is high enough. B.The "exact" voltage gain is affected by all 4 resistors, regardless of the value of VCC if the transistor is operating in the forward active region. C.The "exact" voltage gain is only a function of R6 and R5. D.None of the other choices is correct.

20. Suppose that the values of all 4 resistors and VCC are configured such that the amplifier is achieving a gain of 10 dB, the transistor is operating in the forward active region, and the Q point is near the middle of the load line. The source impedance of V1 is negligible. What happens if R3 and R4 are each increased by a factor of 10? A.VCE increases, ICQ increases, and the "exact" voltage gain increases. B.VCE decreases, ICQ decreases, and the "exact" voltage gain decreases. C.VCE increases, ICQ decreases, and the "exact" voltage gain decreases. D.None of the other choices is correct.

21. Suppose that the values of all 4 resistors and VCC are configured such that the amplifier is achieving a gain of 10 dB, the transistor is operating in the forward active region, and the Q point is near the middle of the load line. The source impedance of V1 is negligible. What happens if R3 and R4 are each increased by a factor of 10? A.VCE increases, ICQ increases, and the "exact" voltage gain increases. B.VCE decreases, ICQ decreases, and the "exact" voltage gain decreases. C.VCE increases, ICQ decreases, and the "exact" voltage gain decreases. D.None of the other choices is correct.

22. Which of the following describes the frequency response characteristic of this circuit. A.Low pass B.High pass C.Band pass D.Joe Pass A B C

23. Which of the following describes the frequency response characteristic of this circuit. A.Low pass B.High pass C.Band pass D.Joe Pass A B C

25. Which of the following is the most plausible pole-zero plot for the system?

26. Assume R4 = 470K, C5=C7=0.22µF, R10=47K and R3=270K. If C5 and C7 are both increased to 0.47µF, how would the Bode plot of Figure 4 change? 1)The general shape would remain the same, but point "A" would move to the left. 2)The general shape would remain the same, but point "B" would move to the left. 3)Both points "A" and "B" would move to the right. 4)None of the other choices is correct. A B

27. Assume R4 = 470K, C5=C7=0.22µF, R10=47K and R3=270K. If C5 and C7 are both increased to 0.47µF, how would the Bode plot of Figure 4 change? 1)The general shape would remain the same, but point "A" would move to the left. 2)The general shape would remain the same, but point "B" would move to the left. 3)Both points "A" and "B" would move to the right. 4)None of the other choices is correct. A B