Malvino Chapter 20

Chapter 20 

1. In a linear op-amp circuit, the 
a. Signals are always sine waves 
b. Op amp does not go into saturation 
c. Input impedance is ideally infinite 
d. Gain-bandwidth product is constant 

2. In an ac amplifier using an op amp with coupling and bypass capacitors, the output offset voltage is 
a. Zero 
b. Minimum 
c. Maximum 
d. Unchanged 

3. To use an op amp, you need at least 
a. One supply voltage 
b. Two supply voltages 
c. One coupling capacitor 
d. One bypass capacitor 


4. In a controlled current source with op amps, the circuit acts like a 
a. Voltage amplifier 
b. Current-to-voltage converter 
c. Voltage-to-current converter 
d. Current amplifier 

5. An instrumentation amplifier has a high 
a. Output impedance 
b. Power gain 
c. CMRR 
d. Supply voltage 

6. A current booster on the output of an op amp will increase the short-circuit current by 
a. ACL 
b. Beta dc 
c. funity 
d. Av 

7. Given a voltage reference of +2.5 V, we can get a voltage reference of +15 V by using a 
a. Inverting amplifier 
b. Noninverting amplifier 
c. Differential amplifier 
d. Instrumentation amplifier 

8. In a differential amplifier, the CMRR is limited mostly by 
a. CMRR of the op amp 
b. Gain-bandwidth product 
c. Supply voltages 
d. Tolerance of resistors 

9. The input signal for an instrumentation amplifier usually comes from 
a. An inverting amplifier 
b. A transducer 
c. A differential amplifier 
d. A Wheatstone bridge 

10. In the classic three op-amp instrumentation amplifier, the differential voltage gain isusually produced by the 
a. First stage 
b. Second stage 
c. Mismatched resistors 
d. Output op amp 

11. Guard driving reduces the 
a. CMRR of an instrumentation amplifier 
b. Leakage current in the shielded cable 
c. Voltage gain of the first stage 
d. Common-mode input voltage 

12. In an averaging circuit, the input resistances are 
a. Equal to the feedback resistance 
b. Less than the feedback resistance 
c. Greater than the feedback resistance 
d. Unequal to each other 

13. A D/A converter isan application of the 
a. Adjustable bandwidth circuit 
b. Noninverting amplifier 
c. Voltage-to-current converter 
d. Summing amplifier 

14. In a voltage-controlled current source, 
a. A current booster is never used 
b. The load is always floated 
c. A stiff current source drives the load 
d. The load current equals ISC 

15. The Howland current source produces a 
a. Unidirectional floating load current 
b. Bidirectional single-ended load current 
c. Unidirectional single-ended load current 
d. Bidirectional floating load current 

16. The purpose of AGC is to 
a. Increase the voltage gain when the input signal increases 
b. Convert voltage to current 
c. Keep the output voltage almost constant 
d. Reduce the CMRR of the circuit 

17. 1 ppm is equivalent to 
a. 0.1% 
b. 0.01% 
c. 0.001% 
d. 0.0001% 

18. An input transducer converts 
a. Voltage to current 
b. Current to voltage 
c. An electrical quantity to a nonelectrical quantity 
d. A nonelectrical quantity to an electrical quantity 

19. A thermistor converts 
a. Light to resistance 
b. Temperature to resistance 
c. Voltage to sound 
d. Current to voltage 

20. When we trim a resistor, we are 
a. Making a fine adjustment 
b. Reducing its value 
c. Increasing its value 
d. Making a coarse adjustment 

21. A D/A converter with four inputs has 
a. Two outputs 
b. Four outputs 
c. Eight outputs 
d. Sixteen outputs 

22. An op amp with a rail-to-rail output 
a. Has a current-boosted output 
b. Can swing all the way to either supply voltage 
c. Has a high output impedance 
d. Cannot be less than 0 V. 

23. When a JFET is used in an AGC circuit, it acts like a 
a. Switch 
b. Voltage-controlled current source 
c. Voltage-controlled resistance 
d. Capacitance 

24. If an op amp has only a positive supply voltage, its output cannot 
a. Be negative 
b. Be zero 
c. Equal the supply voltage 
d. Be ac coupled




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 19
Malvino Chapter 21
Malvino Chapter 22
Malvino Chapter 23
Malvino Chapter 24