# Malvino: MCQ in Linear Op Amp Circuits

(Last Updated On: February 7, 2020)

This is the Multiple Choice Questions in Chapter 20: Linear Op-Amp Circuits from the book Electronic Principles 7th Edition by Albert Malvino. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

### Topic Outline

• MCQs in Inverting Amplifier Circuits
• MCQs in Noninverting Amplifier Circuit
• MCQs in Inverter and Noninverter Circuits
• MCQs in Differential Amplifier
• MCQs in Instrumentation Amplifiers
• MCQs in Summing Amplifier Circuits
• MCQs in Current Boosters
• MCQs in Voltage Controlled Current Sources
• MCQs in Automatic Gain Control
• MCQs in Single Supply Operation

### Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

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 is usually 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 is an 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

### Complete List of MCQ in Electronic Principles by Albert Malvino

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