In this section of Electronic Devices and Circuits.It contain Switching and Wave Shaping Circuits MCQs (Multiple Choice Questions Answers).All the MCQs (Multiple Choice Question Answers) requires in depth reading of Electronic Devices and Circuits Subject as the hardness level of MCQs have been kept to advance level.These Sets of Questions are very helpful in Preparing for various Competitive Exams and University level Exams.
This Section covers below lists of topics :
- Switching and Wave Shaping Circuits MCQs.
- Multivibrators,monostable, bistable MCQs.
- Wave Shaping by Differentiating circuits MCQs
- Wave Shaping by Integrating circuits MCQs
- voltage multiplier MCQs
- Clipping Circuits MCQs
- Clamping circuits MCQs
Practice it now to sharpen your concept.
PRACTICE IT NOW TO SHARPEN YOUR CONCEPT AND KNOWLEDGE
1. While operating as a switch, transistor is
- Always in cut off state
- Always in saturation state
- Either in cut off or saturation state
- None of these
C. Either in cut off or saturation state
2. The maximum speed of operation of an electronic switch is
- 5 operation /sec
- 10^9 operation /sec
- 100 operation /sec
- 1000 operation /sec
B. 10^9 operation /sec
3. A circuit that generates square wave is called
- An oscillator
- A multivibrator
- A modulator
- A differentiator
B. A multivibrator
4. In a voltage Tripler the numbers of capacitor diode sections employed are
- One
- Two
- Three
- Four
C. Three
5. An RC series circuit can be used as an integrator when output a taken across
- Resistor R
- Capacitor C
- Either of the above
- None of these
B. Capacitor C
6. If a square wave is fed to a differentiating circuit, the output will be
- Sharp narrow pulses
- Triangular wave
- Saw tooth wave
- Sine wave
A. Sharp narrow pulses
7. A multivibrator that generates square wave of its own is called a
- Monostable multivibrator
- Bistable multivibrator
- Astable multivibrator
- None of these
C. Astable multivibrator
8. A relay is basically has
- Mechanical switch
- Electromechanical switch
- Electronic switch
- Tumbler switch
B. Electromechanical switch
9. A bistable multiplier is a circuit that
- No stable stage
- One stable state
- Two stable state
- One transistor to generate square wave
C. Two stable state
10. A voltage multiplier is a circuit that
- Amplifies voltage
- Raises the peak input voltage to 2,3,4 times
- Changes the shape of input voltage
- None of these
B. Raises the peak input voltage to 2,3,4 times
11. In a nonlinear op-amp circuit, the
- Op amp never saturates
- Feedback loop is never opened
- Output shape is the same as the input shape
- Op amp may saturate
A. Op amp never saturates
12. To detect when the input is greater than a particular value, use a
- Comparator
- Clamper
- Limiter
- Relaxation oscillator
A. Comparator
13. The voltage out of a Schmitt trigger is
- A low voltage
- A high voltage
- Either a low or a high voltage
- A sine wave
C. Either a low or a high voltage
14. Hysteresis prevents false triggering associated with
- A sinusoidal input
- Noise voltages
- Stray capacitances
- Trip points
B. Noise voltages
15. If the input is a rectangular pulse, the output of an integrator is a
- Sine wave
- Square wave
- Ramp
- Rectangular pulse
C. Ramp
16. When a large sine wave drives a Schmitt trigger, the output is
- Rectangular wave
- Triangular wave
- Rectified sine wave
- Series of ramps
A. Rectangular wave
17. If pulse width decreases and the period stays the same, the duty cycle
- Decreases
- Stays the same
- Increases
- Is zero
A. Decreases
18. The output of a relaxation oscillator is a
- Sine wave
- Square wave
- Ramp
- Spike
B. Square wave
19. If AOL = 200,000, the closed-loop knee voltage of a silicon diode is
- 1 uV
- 3.5 uV
- 7 uV
- 14 uV
B. 3.5 uV
20. 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
- 0
- 4 V
- 8 V
- 16 V
B. 4 V
21. 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
- 0
- 2 Vpp
- 6 Vpp
- 8 Vpp
C. 6 Vpp
22. The discharging time constant of a peak detector is 10 ms. The lowest frequency you should use is
- 10 Hz
- 100 Hz
- 1 kHz
- 10 kHz
C. 1 kHz
23. A comparator with a trip point of zero is sometimes called a
- Threshold detector
- Zero-crossing detector
- Positive limit detector
- Half-wave detector
B. Zero-crossing detector
24. To work properly, many IC comparators need an external
- Compensating capacitor
- Pullup resistor
- Bypass circuit
- Output stage
B. Pullup resistor
25. A Schmitt trigger uses
- Positive feedback
- Negative feedback
- Compensating capacitors
- Pullup resistors
A. Positive feedback
26. A Schmitt trigger
- Is a zero-crossing detector
- Has two trip points
- Produces triangular output waves
- Is designed to trigger on noise voltage
B. Has two trip points
27. A relaxation oscillator depends on the charging of a capacitor through a
- Resistor
- Inductor
- Capacitor
- Noninverting input
A. Resistor
28. A ramp of voltage
- Always increases
- Is a rectangular pulse
- Increases or decreases at a linear rate
- Is produced by hysteresis
C. Increases or decreases at a linear rate
29. The op-amp integrator uses
- Inductors
- The Miller effect
- Sinusoidal inputs
- Hysteresis
B. The Miller effect
30. The trip point of a comparator is the input voltage that causes
- The circuit to oscillate
- Peak detection of the input signal
- The output to switch states
- Clamping to occur
C. The output to switch states
31. In an op-amp integrator, the current through the input resistor flows into the
- Inverting input
- Noninverting input
- Bypass capacitor
- Feedback capacitor
D. Feedback capacitor
32. An active half-wave rectifier has a knee voltage of
- VK
- 0.7 V
- More than 0.7 V
- Much less than 0.7 V
D. Much less than 0.7 V
33. In an active peak detector, the discharging time constant is
- Much longer than the period
- Much shorter than the period
- Equal to the period
- The same as the charging time constant
A. Much longer than the period
34. If the reference voltage is zero, the output of an active positive limiter is
- Positive
- Negative
- Either positive or negative
- A ramp
B. Negative
35. The output of an active positive clamper is
- Positive
- Negative
- Either positive or negative
- A ramp
A. Positive
36. The positive clamper adds
- A positive dc voltage to the input
- A negative dc voltage to the input
- An ac signal to the output
- A trip point to the input
A. A positive dc voltage to the input
37. A window comparator
- Has only one usable threshold
- Uses hysteresis to speed up response
- Clamps the input positively
- Detects an input voltage between two limits
D. Detects an input voltage between two limits
