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
Start Practice Exam Test Questions
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
26. The positive clamper adds
- 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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