Malvino Chapter 19

Chapter 19 

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 noninverting 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 inputimpedance 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 




Also try:

Malvino Chapter 1
Malvino Chapter 2
Malvino Chapter 3
Malvino Chapter 4
Malvino Chapter 5
Malvino Chapter 6
Malvino Chapter 7
Malvino Chapter 8
Malvino Chapter 9
Malvino Chapter 10
Malvino Chapter 11
Malvino Chapter 12
Malvino Chapter 13
Malvino Chapter 14
Malvino Chapter 15
Malvino Chapter 16
Malvino Chapter 17
Malvino Chapter 18
Malvino Chapter 20
Malvino Chapter 21
Malvino Chapter 22
Malvino Chapter 23
Malvino Chapter 24