Analog Electronic Circuits Questions and Answers – Diode Clipper and Clamper

This set of Analog Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Diode Clipper and Clamper”.

1. What is the circuit in the given diagram called?
Clipper circuit diagram with input vi is greater than 5V
a) Clipper
b) Clamper
c) Half wave rectifier
d) Full wave rectifier
View Answer

Answer: a
Explanation: The circuit given above is a clipper. The diode conducts when it is forward biased, i.e, whenever the input vi is greater than 5V (for ideal diode). For lower voltages, the diode does not conduct and the output is zero.

2. What is the circuit in the given diagram called?
Clamper circuit diagram with forward biased diode & no signal appears across the output
a) Clipper
b) Clamper
c) Half wave rectifier
d) Full wave rectifier
View Answer

Answer: b
Explanation: During the positive half cycle, the diode is forward biased and no signal appears across the output. The capacitor holds the charge in that state. During negative cycle, diode is reverse biased and diode does not conduct. The charge in capacitor is released and is obtained at the output.

3. For a sinusoidal input of 20 Vpeak to the given circuit, what is the peak value of the output waveform?
Find the peak value of the output waveform for sinusoidal input of 20 Vpeak
a) 20 V
b) 25 V
c) 0 V
d) -25 V
View Answer

Answer: b
Explanation: In the given circuit, the output becomes zero for vi less than -5 V. Hence, the peak value of the output is 25 V owing to the additive effect of V for vi.
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4. For the given circuit for a 20 Vpeak sinusoidal input vi, what is the value of vi at which the clipping begins?
Find the value of vi for a 20 Vpeak sinusoidal input vi at beginning of clipping
a) 5 V
b) 0 V
c) -5 V
d) Clipping doesn’t occur
View Answer

Answer: c
Explanation: Considering the connection of diode, it is evident that the diode becomes reverse biased when vi < -5 V. Hence, clipping starts at -5 V.

5. For a sinusoidal input of 20 Vpeak to the given circuit, what is the minimum value of the output waveform?
Find minimum value of output waveform for sinusoidal input of 20 Vpeak to given circuit
a) 20 V
b) 25 V
c) -25 V
d) 0 V
View Answer

Answer: d
Explanation: The given circuit is a clipper that cuts off a part of the negative cycle of the input sinusoid i.e. the output becomes zero for a certain region of the input waveform. Hence, the minimum value is 0 V.
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6. For the given input waveform to the given circuit, what is the peak value of the output waveform?
Determine the peak value of the output waveform when diode in off stage
a) 0 V
b) 16 V
c) 12 V
d) 0 V
View Answer

Answer: b
Explanation: In the given circuit, the diode is in the off stage when vi > 4 V. Hence, when vi > 4 V, vo = vi and hence the peak value of vo = the peak value of vi = 16 V.

7. For the given input waveform to the given circuit, what is the minimum value of the output waveform?
Parallel clipper circuit diagram with input less than 4V with diode in forward bias
a) 4 V
b) 16 V
c) 12 V
d) 0 V
View Answer

Answer: a
Explanation: The circuit above is a parallel clipper. When the input is less than 4V, then diode is forward biased and thus output voltage is 4V. When input increases above 4V, the diode is reverse biased and output is equal to the input. Hence, minimum output is 4V.
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8. Which of the following is not a necessary component in a clamper circuit?
a) Diode
b) Capacitor
c) Resistor
d) Independent DC Supply
View Answer

Answer: d
Explanation: Diode, Capacitor and Resistor are necessary to build a clamper circuit. An independent DC supply is required to bring an additional shift.

9. For the given circuit, what is the minimum peak value of the output waveform if the input waveform is 10V square wave with switching time of 1 second?
Assume that the input switches between +10V and -10V DC levels.
Find minimum peak value of output waveform if input waveform is 10V square wave with time
a) 0 V
b) -5 V
c) -20 V
d) -10 V
View Answer

Answer: c
Explanation: For the positive half of the input, the diode is in the on state and hence acts as a short circuit and hence vo = 0 V. For the negative half cycle, the resistor receives voltage input both from the source and the capacitor which is charged during the positive half of the input. Hence, vo = -20 V.
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10. For the given circuit and input waveform, the peak value of the output is +30V.
Clamper circuit diagram with an independent DC supply of +10 V
a) True
b) False
View Answer

Answer: a
Explanation: The given circuit is a clamper with an independent DC supply of +10 V. Keeping in mind the connection of the diode and the DC supply, we see that the output waveform is clamped at +10V i.e. it shifts up by +10V. Hence, the maximum value of vo=+30 V.

Sanfoundry Global Education & Learning Series – Analog Circuits.

To practice all areas of Analog Circuits, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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