# MCQs in Nonlinear Op-Amp Circuits

Multiple Choice Questions in Nonlinear Op-Amp Circuits from the book Electronic Principles by Albert Malvino. Make sure to familiarize each and every questions

This is the Multiple Choice Questions in Chapter 22: Nonlinear 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 Comparators with Zero Reference
• MCQs in Comparators with Nonzero Reference
• MCQs in Comparators with Hysteresis
• MCQs in Window Comparator
• MCQs in the Integrator
• MCQs in Waveform Conversion
• MCQs in Waveform Generation
• MCQs in Active Diode Circuits
• MCQs in the Differentiator
• MCQs in Class D Amplifier

### Begin and Good luck!

Choose the letter of the best answer in each questions.

1. In a nonlinear op-amp circuit, the

• a. Op amp never saturates
• b. Feedback loop is never opened
• c. Output shape is the same as the input shape
• d. Op amp may saturate

2. To detect when the input is greater than a particular value, use a

• a. Comparator
• b. Clamper
• c. Limiter
• d. Relaxation oscillator

3. The voltage out of a Schmitt trigger is

• a. A low voltage
• b. A high voltage
• c. Either a low or a high voltage
• d. A sine wave

4. Hysteresis prevents false triggering associated with

• a. A sinusoidal input
• b. Noise voltages
• c. Stray capacitances
• d. Trip points

5. If the input is a rectangular pulse, the output of an integrator is a

• a. Sine wave
• b. Square wave
• c. Ramp
• d. Rectangular pulse

6. When a large sine wave drives a Schmitt trigger, the output is

• a. Rectangular wave
• b. Triangular wave
• c. Rectified sine wave
• d. Series of ramps

7.If pulse width decreases and the period stays the same, the duty cycle

• a. Decreases
• b. Stays the same
• c. Increases
• d. Is zero

8. The output of a relaxation oscillator is a

• a. Sine wave
• b. Square wave
• c. Ramp
• d. Spike

9. If AOL = 200,000, the closed-loop knee voltage of a silicon diode is

• a. 1 uV
• b. 3.5 uV
• c. 7 uV
• d. 14 uV

10. The input to a peak detector is a triangular wave with a peak-to-peak value of 8 V and an average value of 0. The output is

• a. 0
• b. 4 V
• c. 8 V
• d. 16 V

11. The input voltage to a positive limiter is a triangular wave of 8 Vpp and an average value of 0. If the reference level is 2 V, the output is

• a. 0
• b. 2 Vpp
• c. 6 Vpp
• d. 8 Vpp

12. The discharging time constant of a peak detector is 10 ms. The lowest frequency you should use is

• a.10 Hz
• b.100 Hz
• c. 1 kHz
• d. 10 kHz

13. A comparator with a trip point of zero is sometimes called a

• a. Threshold detector
• b. Zero-crossing detector
• c. Positive limit detector
• d. Half-wave detector

14. To work properly, many IC comparators need an external

• a. Compensating capacitor
• b. Pullup resistor
• c. Bypass circuit
• d. Output stage

15. A Schmitt trigger uses

• a. Positive feedback
• b. Negative feedback
• c. Compensating capacitors
• d. Pullup resistors

16. A Schmitt trigger

• a. Is a zero-crossing detector
• b. Has two trip points
• c. Produces triangular output waves
• d. Is designed to trigger on noise voltage

17. A relaxation oscillator depends on the charging of a capacitor through a

• a. Resistor
• b. Inductor
• c. Capacitor
• d. Noninverting input

18. A ramp of voltage

• a. Always increases
• b. Is a rectangular pulse
• c. Increases or decreases at a linear rate
• d. Is produced by hysteresis

19. The op-amp integrator uses

• a. Inductors
• b. The Miller effect
• c. Sinusoidal inputs
• d. Hysteresis

20. The trip point of a comparator is the input voltage that causes

• a. The circuit to oscillate
• b. Peak detection of the input signal
• c. The output to switch states
• d. Clamping to occur

21. In an op-amp integrator, the current through the input resistor flows into the

• a. Inverting input
• b. Noninverting input
• c. Bypass capacitor
• d. Feedback capacitor

22. An active half-wave rectifier has a knee voltage of

• a. VK
• b. 0.7 V
• c. More than 0.7 V
• d. Much less than 0.7 V

23. In an active peak detector, the discharging time constant is

• a. Much longer than the period
• b. Much shorter than the period
• c. Equal to the period
• d. The same as the charging time constant

24. If the reference voltage is zero, the output of an active positive limiter is

• a. Positive
• b. Negative
• c. Either positive or negative
• d. A ramp

25. The output of an active positive clamper is

• a. Positive
• b. Negative
• c. Either positive or negative
• d. A ramp

• a. A positive dc voltage to the input
• b. A negative dc voltage to the input
• c. An ac signal to the output
• d. A trip point to the input

27. A window comparator

• a. Has only one usable threshold
• b. Uses hysteresis to speed up response
• c. Clamps the input positively
• d. Detects an input voltage between two limits

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