Topic Outline
- MCQs in Four Types of Negative Feedback
- MCQs in VCVS Voltage Gain
- MCQs in ICVS Amplifier
- MCQs in VCIS Amplifier
- MCQs in ICIS Amplifier
- MCQs in Bandwidth
Start Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. With negative feedback, the returning signal
- a. Aids the input signal
- b. Opposes the input signal
- c. Is proportional to output current
- d. Is proportional to differential voltage gain
2. How many types of negative feedback are there?
- a. One
- b. Two
- c. Three
- d. Four
3. A VCVS amplifier approximates an ideal
- a. Voltage amplifier
- b. Current-to-voltage converter
- c. Voltage-to-current converter
- d. Current amplifier
4. The voltage between the input terminals of an ideal op amp is
- a. Zero
- b. Very small
- c. Very large
- d. Equal to the input voltage
5. When an op amp is not saturated, the voltages at the non-inverting and inverting inputs are
- a. Almost equal
- b. Much different
- c. Equal to the output voltage
- d. Equal to +15 V
6. The feedback fraction B
- a. Is always less than 1
- b. Is usually greater than 1
- c. May equal 1
- d. May not equal 1
7. An ICVS amplifier has no output voltage. A possible trouble is
- a. No negative supply voltage
- b. Shorted feedback resistor
- c. No feedback voltage
- d. Open load resistor
8. In a VCVS amplifier, any decrease in open-loop voltage gain produces an increase in
- a. Output voltage
- b. Error voltage
- c. Feedback voltage
- d. Input voltage
9. The open-loop voltage gain equals the
- a. Gain with negative feedback
- b. Differential voltage gain of the op amp
- c. Gain when B is 1
- d. Gain at funity
10. The loop gain AOLB
- a. Is usually much smaller than 1
- b. Is usually much greater than 1
- c. May not equal 1
- d. Is between 0 and 1
11. The closed-loop input impedance with an ICVS amplifier is
- a. Usually larger than the open-loop input impedance
- b. Equal to the open-loop input impedance
- c. Sometimes less than the open-loop impedance
- d. Ideally zero
12. With an ICVS amplifier, the circuit approximates an ideal
- a. Voltage amplifier
- b. Current-to-voltage converter
- c. Voltage-to-current converter
- d. Current amplifier
13. Negative feedback reduces the
- a. Feedback fraction
- b. Distortion
- c. Input offset voltage
- d. Loop gain
14. A voltage follower has a voltage gain of
- a. Much less than 1
- b. 1
- c. More than 1
- d. A
15. The voltage between the input terminals of a real op amp is
- a. Zero
- b. Very small
- c. Very large
- d. Equal to the input voltage
16. The transresistance of an amplifier is the ratio of its
- a. Output current to input voltage
- b. Input voltage to output current
- c. Output voltage to input voltage
- d. Output voltage to input current
17. Current cannot flow to ground through
- a. A mechanical ground
- b. An ac ground
- c. A virtual ground
- d. An ordinary ground
18. In a current-to-voltage converter, the input current flows
- a. Through the input impedance of the op amp
- b. Through the feedback resistor
- c. To ground
- d. Through the load resistor
19. The input impedance of a current-to-voltage converter is
- a. Small
- b. Large
- c. Ideally zero
- d. Ideally infinite
20. The open-loop bandwidth equals
- a. funity
- b. f2(OL)
- c. funity/ACL
- d. fmax
21. The closed-loop bandwidth equals
- a. funity
- b. f2(OL)
- c. funity/ACL
- d. fmax
22. For a given op amp, which of these is constant?
- a. f2(CL)
- b. Feedback voltage
- c. ACL
- d. ACLf2(CL)
23. Negative feedback does not improve
- a. Stability of voltage gain
- b. Nonlinear distortion in later stages
- c. Output offset voltage
- d. Power bandwidth
24. An ICVS amplifier is saturated. A possible trouble is
- a. No supply voltages
- b. Open feedback resistor
- c. No input voltage
- d. Open load resistor
25. A VCVS amplifier has no output voltage. A possible trouble is
- a. Shorted load resistor
- b. Open feedback resistor
- c. Excessive input voltage
- d. Open load resistor
26. An ICIS amplifier is saturated. A possible trouble is
- a. Shorted load resistor
- b. R2 is open
- c. No input voltage
- d. Open load resistor
27. An ICVS amplifier has no output voltage. A possible trouble is
- a. No positive supply voltage
- b. Open feedback resistor
- c. No feedback voltage
- d. Shorted load resistor
28. The closed-loop input impedance in a VCVS amplifier is
- a. Usually larger than the open-loop input impedance
- b. Equal to the open-loop input impedance
- c. Sometimes less than the open-loop input impedance
- d. Ideally zero
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