Online Questions and Answers Topic Outline
- MCQs in Constant-Gain Multiplier
- MCQs in Voltage Summing
- MCQs in Voltage Buffer
- MCQs in Controller Sources
- MCQs in Instrumentation Circuits
- MCQs in Active Filters
Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. Determine the output voltage for this circuit with a sinusoidal input of 2.5 mV.
![clip_image002[31]](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6EZ08IDjE2zDtSgPjavgUH1Xa4My9HwGiNM5n-bY2vYgeRu_4Wm6Vb3_0iLdN5pGJggTF-ulbsJzU2_doyfNTkfW5Fs2Vv93e7lyobrU_zuSZcePvl6ns4f1kFwwEgdzxdVcYOQ6MORUq/s1600-h/clip_image002%25255B31%25255D%25255B12%25255D.png "clip_image002[31]")
- a. –0.25 V
- b. –0.125 V
- c. 0.25 V
- d. 0.125 V
2. Calculate the input voltage for this circuit if Vo = –11 V.
- a. 1.1 V
- b. –1.1 V
- c. –1 V
- d. 1 V
3. Calculate the output voltage.
- a. –6.00 mV
- b. 6.0 mV
- c. 6.12 mV
- d. –6.12 Mv
4. Calculate the input voltage when Vo = 11 V.
- a. 1.1 V
- b. –1.1 V
- c. –1 V
- d. 1 V
5. Calculate the output voltage.
- a. 3.02 V
- b. 2.03 V
- c. 1.78 V
- d. 1.50 V
6. Calculate the output of the first-stage op-amp when V1 = 25 mV.
![clip_image012[11]](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi47M0Z8Td1X4tDWjSyzW1dnHXerCwWdzrpTspxd376qup4uDUmeM5sy4TlZoOKlCESPuPi08L7hSzn_NOC87LnRpKgUlu_f2rtV26lscxNoenQ9cLPl6YrterhlopIsVJNa2T4Cn4Ky3eO/s1600-h/clip_image012%25255B11%25255D%25255B12%25255D.png "clip_image012[11]")
- a. –1.05 V
- b. 0.075 V
- c. 0.06 V
- d. 4.2 V
7. Calculate the output of the second stage op-amp if V1 = 25 mV.
- a. –0.075 V
- b. 0.525 V
- c. 0.06 V
- d. 4.2 V
8. Calculate the input voltage if the final output is 10.08 V.
- a. –1.05 V
- b. 0.525 V
- c. 0.168 V
- d. 4.2 V
9. Determine the value of Rf (assuming that all have the same value).
- a. 500 kΩ
- b. 50 kΩ
- c. 25 kΩ
- d. 5 kΩ
10. When a number of stages are connected in parallel, the overall gain is the product of the individual stage gains.
- a. True
- b. False
11. A number of op-amp stages can be used to provide separate gains.
- a. True
- b. False
12. Calculate the output voltage if V1 = V2 = 0.15 V.
- a. 0 V
- b. 4.65 V
- c. 6.45 V
- d. –6.45 V
13. Calculate the output voltage if V1 = –3.3 V and V2 = 0.8 V
- a. 0 V
- b. –6.6 V
- c. –4 V
- d. 2 V
14. Calculate the output voltage if V1 = 33 mV and V2 = 02 mV.
- a. 0 V
- b. –6.6 V
- c. –4 V
- d. 2
15. Calculate the output voltage if V1 = 0 V and V2 = 0.2 V.
- a. 0 V
- b. –6.6 V
- c. –4 V
- d. 2 V
16. Calculate the output voltage if V1 = –0.2 V and V2 = 0 V.
- a. 0 V
- b. –6.6 V
- c. –4 V
- d. 2 V
17. Determine the output voltage.
- a. 10(V2 – Vi)
- b. –10(V2 – V1)
- c. –10(V1 – V2)
- d. None of the above
18. Calculate the output voltage if V1 = 300 mV and V2 = 700 mV.
- a. 0 V
- b. –12 V
- c. 12 V
- d. –4 V
19. Calculate the output voltage if V1 = V2 = 700 mV.
- a. 0 V
- b. –12 V
- c. 12 V
- d. –8 V
20. Refer to Fig. Calculate the output voltage Vo if V1 = –V2 = 300 mV.
- a. 0 V
- b. –12 V
- c. 12 V
- d. –8 V
21. Determine the output voltage when V1 = V2 = 1 V.
- a. 0 V
- b. –2 V
- c. 1 V
- d. 2 V
22. Determine the output voltage when V1 = –V2 = 1 V.
- a. 0 V
- b. –2 V
- c. 1 V
- d. 2 V
23. Determine the output voltage when V1 = –V2 = –1 V.
- a. 0 V
- b. –2 V
- c. 1 V
- d. 2 V
24. How many op-amps are required to implement this equation?
- a. 2
- b. 3
- c. 4
- d. 1
25. How many op-amps are required to implement this equation?
- a. 2
- b. 3
- c. 4
- d. 1
26. How many op-amps are required to implement this equation?
- a. 2
- b. 3
- c. 4
- d. 1
27. How many op-amps are required to implement this equation?
Vo = V1
- a. 2
- b. 3
- c. 4
- d. 1
28. Calculate IL for this circuit.
- a. 3 mA
- b. 4 mA
- c. 5 mA
- d. 6 mA
29. Calculate the output voltage for this circuit when V1 = 2.5 V and V2 = 2.25 V.
- a. –5.25 V
- b. 2.5 V
- c. 2.25 V
- d. 5.25 V
30. An example of an instrumentation circuit is a(n) _____.
- a. dc voltmeter
- b. display driver
- c. ac voltmeter
- d. All of the above
31. This circuit is an example of a(n)________.
- a. dc voltmeter
- b. display driver
- c. instrumentation amplifier
- d. None of the above
32. Calculate the cut-off frequency of a first-order low-pass filter for R1 = 2.5 kΩ and C1 = 0.05 μF.
- a. 1.273 kHz
- b. 12.73 kHz
- c. 127.3 kHz
- d. 127.30 Hz
33. Calculate the cutoff frequencies of a bandpass filter with R1 = R2 = 5 kΩ and C1 = C2 = 0.1 μF.
- a. fOL = 318.3 Hz, fOH = 318.3 Hz
- b. fOL = 636.6 Hz, fOH = 636.6 Hz
- c. fOL = 318.3 Hz, fOH = 636.6 Hz
- d. fOL = 636.6 Hz, fOH = 318.3
34. A filter that provides a constant output from dc up to a cut-off frequency and passes no signal above that frequency is called a _____ filter.
- a. low-pass
- b. high-pass
- c. bandpass
35. A difference between a passive filter and an active filter is that a passive filter uses amplifier(s), but an active filter does not.
- A. True
- B. False
FILL-IN-THE-BLANKS
1. The level of the output voltage of an op-amp circuit is always _____ the level of VCC.
- A. larger than
- B. the same as
- C. smaller than
- D. None of the above
2. The input to an op-amp can be a(n) _____.
- A. dc source
- B. ac source
- C. combination of ac and dc sources
- D. All of the above
3. When a number of stages are connected in series, the overall gain is the _____ of the individual stage gains.
- A. sum
- B. product
- C. difference
- D. average
4. _____ build a multistage connection.
- A. Only an inverting op-amp circuit must be used to
- B. Only a noninverting op-amp circuit must be used to
- C. Both inverting and noninverting op-amp circuits can be used to
- D. Neither inverting nor noninverting op-amp circuits must be used to
5. A voltage summing amplifier has _____.
- A. several inputs and several outputs
- B. several inputs and one output
- C. one input and several outputs
- D. one input and one output
6. The voltage gain of a voltage buffer is _____ .
- A. 1
- B. 0
- C. –1
- D. –5
7. The output voltage of a voltage buffer is _____ with the input voltage.
- A. in phase
- B. 45º out of phase
- C. 90º out of phase
- D. 180º out of phase
8. The input impedance of a voltage buffer is _____.
- A. very low
- B. low
- C. high
- D. very high
9. The output impedance of a voltage buffer is _____.
- A. very low
- B. low
- C. high
- D. very high
10. Op-amps can be used to form _____ circuit(s).
- A. voltage-controlled voltage source
- B. voltage-controlled current source
- C. current-controlled voltage source
- D. All of the above
11. _____ in a current-controlled voltage source circuit.
- A. The input current depends on the output voltage
- B. The input current depends on the input voltage source
- C. The output voltage depends on the input current.
- D. The output current depends on the output voltage source
12. _____ can be used as a voltage-controlled voltage source.
- A. Only an inverting op-amp circuit
- B. Only a noninverting op-amp circuit
- C. Neither inverting nor noninverting op-amp circuits
- D. Both inverting and noninverting op-amp circuits
13. In a current-controlled voltage source using the inverting op-amp circuit, the controlled output current is _____ with the input voltage source.
- A. in phase
- B. 45º out of phase
- C. 90º out of phase
- D. 180º out of phase
14. Op-amp circuits are used in _____ voltmeters.
- A. only dc
- B. only ac
- C. both ac and dc
- D. neither ac nor dc
15. In a current-controlled current source, the controlled current Io depends on _____.
- A. I1
- B. R1
- C. R2
- D. All of the above
16. In a dc millivoltmeter, the amplifier provides a meter with _____ input impedance and a scale factor dependent on _____ value and accuracy.
- A. high, resistor
- B. low, resistor
- C. high, capacitor
- D. None of the above
17. In a millivoltmeter, the diodes and the capacitor are used in _____ parts of the circuit.
- A. the dc
- B. the ac
- C. both the dc and ac
- D. neither the dc nor ac
18. In an instrumentation amplifier, the output voltage is based on the _____ times a scale factor.
- A. summation of the two inputs
- B. product of the two inputs
- C. difference between the two inputs
- D. None of the above
19. A(n) _____ is not a component of a passive filter.
- A. op-amp
- B. capacitor
- C. inductor
- D. resistor
20. An active circuit is composed of a(n) _____.
- A. resistor
- B. capacitor
- C. op-amp
- D. All of the above
21. A low-pass filter _____.
- A. provides a constant output up to the cutoff frequency
- B. passes frequencies from zero up to the cutoff frequency
- C. rejects all frequencies above the cutoff frequency
- D. All of the above
22. A filter that passes signals that are above one ideal cutoff frequency and below a second cutoff frequency is called _____.
- A. low-pass
- B. high-pass
- C. bandpass
- D. band reject
23. The roll-off for a first-order high-pass filter is _____.
- A. –20 dB/decade
- B. –6 dB/octave
- C. either –20 dB/decade or –6 dB/octave
- D. None of the above
24. The roll-off for a second-order high-pass filter is _____.
- A. either –20 dB per decade or –6 dB per octave
- B. either –40 dB per decade or –12 dB per octave
- C. either –60 dB per decade or –18 dB per octave
- D. None of the above
25. A bandpass filter uses _____ circuit.
- A. a high-pass
- B. a low-pass
- C. a high-pass and a low-pass
- D. neither a low-pass nor a high-pass
Post a Comment
EmoticonClick to see the code!
To insert emoticon you must added at least one space before the code.