ECET 220 DeVry Final Exam

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ECET 220 DeVry Final Exam

ECET220

ECET 220 DeVry Final Exam

 

ECET 220 DeVry Final Exam

Page 1

Question 1.1. (TCO 1) For the Zener circuit shown below, if Zener Voltage = 12 V, = 15 V, the current flowing through the Zener diode is 50 mA, and R2 = 2 k, determine the value of R1. Zener Circuit (Points : 5)

  • 53.57 ?
  • 5 k?
  • 10.67 ?
  • 200 ?

Question 2.2. (TCO 2) Which of the following accurately depicts the relationship between the collector, base, and emitter currents in an NPN bipolar junction transistor? (Points : 5)

Question 3.3. (TCO 2) What happens when the base current of a transistor is decreased? (Points : 5)

  • The collector current increases and the emitter current decreases.
  • The collector current increases and the emitter current increases.
  • The collector current decreases and the emitter current decreases.
  • The collector current decreases and the emitter current increases.

Question 4.4. (TCO 2) A transistor has = 100 and = 4 mA A. What is the value for the collector current, ? (Points : 5)

  • 160 mA
  • 360 mA
  • 0.4 A
  • 0.24 A

Question 5.5. (TCO 3) A power amplifier has a gain of 40 dB and an input level of 2 mV. Assuming that the input and output impedances are the same, what is the voltage level at the amplifier output? (Points : 5)

  • 200 mV
  • 300 mV
  • 400 mV
  • 350 mV

Question 6.6. (TCO 4) What is a difference between BJT and FET? (Points : 5)

  • BJT is a unipolar and current-controlled device, whereas FET is a bipolar and voltage-controlled device.
  • BJT is a bipolar and voltage-controlled device, whereas FET is a unipolar and current-controlled device.
  • BJT is a bipolar and current-controlled device, whereas FET is a unipolar and voltage-controlled device.
  • BJT is a unipolar and voltage-controlled device, whereas FET is a bipolar and current-controlled device.

Question 7.7. (TCOs 2 and 4) In which FET amplifier configuration is the gain less than unity? (Points : 5)

  • Common-source
  • Common-gate
  • Common-drain
  • Common-base

Question 8.8. (TCO 5) What is the output impedance for an ideal op-amp? (Points : 5)

  • 0
  • -Rf/Ri
  • 1+Rf/Ri
  • 1000K

Question 9.9. (TCOs 5 and 6) What is the op-amp circuit shown below? Op-amp Circuit (Points : 10)

  • Non-inverting amplifier
  • Differentiator
  • Summing amplifier
  • Integrator

Page 2

Question 1.1. (TCO 2) For the circuit in the following figure (Figure 3-29, on page 135 in textbook), ? ? ? ? ? ? . Determine the DC base voltage with respect to ground. Figure 3-29, on page 135 in textbook (Points : 10)

Question 2.2. (TCO 2) For the circuit in the following figure (Figure 3-29, on page 135 in textbook), ? ? ? ? ? ? . Determine the DC current flowing through resistors Figure 3-29, on page 135 in textbook (Points : 10)

Question 3.3. (TCO 3) For the circuit in the following figure (Figure 3-29, on page 135 in textbook), ? ? ? ? ? ? . Determine the voltage at the DC operating point (Q-point) . Figure 3-29, on page 135 in textbook (Points : 10)

Question 4.4. (TCO 3) For the circuit in the following figure (Figure 3-29, on page 135 in textbook), ? ? ? ? ? ? . Determine the AC voltage gain. Figure 3-29, on page 135 in textbook (Points : 10)

Question 5.5. (TCO 3) For the circuit in the following figure (Figure 3-29, on page 135 in textbook), ? ? ? ? ? ? . Notice that the input voltage is at the point between and . Assume . Determine the power gain Figure 3-29, on page 135 in textbook (Points : 10)

Question 6.6. (TCO 4) For the E-MOSFET Common-Source Amplifier with Voltage-Divider Bias Circuit shown below (Figure 4-41, on page 207 in textbook), ? ? ? ? . Assume ; and . Determine the following.

(1) DC source voltage

(2) DC Drain voltage

(3) The AC output peak-to-peak voltage is input voltage is

Figure 4-41, on page 207 in textbook (Points : 10)

Question 7.7. (TCO 5) For the circuit in the following figure (Figure 6-20, on page 326 in textbook), if ? ? , determine the closed-loop gain. Figure 6-20, on page 326 in textbook (Points : 10)

Question 8.8. (TCO 5) For the circuit in the following figure (Figure 6-24, on page 328 in textbook), if the closed-loop gain is -50, , determine Figure 6-24, on page 328 in textbook (Points : 10)

Question 9.9. (TCO 5) For the circuit in the following figure (Figure 8-7, on page 389 in textbook), if ? and ? , and assume and , determine the hysteresis voltage. Figure 8-7, on page 389 in textbook (Points : 10)

Question 10.10. (TCO 6) For the circuit in the following figure, if ? ? ? , determine the value for so that it will function as an averaging amplifier (meaning the output voltage will be the average value of the input voltages). (Points : 10)

Question 11.11. (TCO 6) For the circuit in the following figure, if ? ? ? ? , determine the value of output voltage (Points : 10)

Question 12.12. (TCO 6) For the instrumentation amplifier shown in the following figure (Figure 12-2 on page 549 in textbook), the values for are fixed for a gain of 1 for the differential amplifier. Also, the values of are exactly matched for the same value = R = 30K.

(1) Determine the value of assuming the voltage gain is 500.

(2) If , determine the voltage output

Figure 12-2 on page 549 in textbook (Points : 10)

Question 13.13. (TCO 7) For the low-pass filter shown in the following figure, the frequency response curve is also shown. If ? ? ? , determine the following values.

(1) The critical frequency

(2) The Damping Factor (DF)

(3) The voltage gain and the voltage gain in dB at 0 (DC), 1, 100, and 1000 Hz

Figure 9-9, page 434 in textbook (Points : 10)

Question 14.14. (TCO 7) For the circuit shown below, ? ? , determine the critical frequency. Also, if ? , design the value for to achieve 2nd order Butterworth response.

Figure 9-10, page 435 in textbook (Points : 10)

Question 15.15. (TCO 7) For the circuit shown below, ? ? ? , determine the values of 1) geometric center frequency; 2) the Q factor; and 3) the Bandwidth.

Figure 9-18, page 443 in textbook (Points : 10)

Page 3

Question 1.1. (TCOs 6 and 8) Elaborate on the structure and function of a differentiator constructed by an op-amp circuit. Give an application example. (Points : 15)

Question 2.2. (TCOs 7 and 8) Elaborate on the difference between the characteristics of the frequency responses of a band-pass filter circuit and a band-stop filter circuit. Give an application example for each type of the filters. (Points : 15)