Electronic Devices and Circuits Questions and Answers – Diode Circuits

This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Diode Circuits”.

1. For the given circuit and input waveform determine the output waveform.
Find the output waveform for the given circuit & input waveform
a)
The output waveform is D for diode is off when Vi lt 5 & for Vi gt 5, Vo = 5V - option a
b)
The output waveform is D for diode is off when Vi lt 5 & for Vi gt 5, Vo = 5V - option b
c)
The output waveform is D for diode is off when Vi lt 5 & for Vi gt 5, Vo = 5V - option c
d)
The output waveform is D for diode is off when Vi lt 5 & for Vi gt 5, Vo = 5V - option d
View Answer

Answer: d
Explanation: Diode is off when Vi < 5 and for Vi > 5, Vo = 5V.

2. Find the output waveform from the given circuit and input waveform.
Find the output waveform from the given circuit & input waveform
a)
Output waveform from circuit & input waveform C if diode is off - option a
b)
Output waveform from circuit & input waveform C if diode is off - option b
c)
Output waveform from circuit & input waveform C if diode is off - option c
d)
Output waveform from circuit & input waveform C if diode is off - option d
View Answer

Answer: c
Explanation: Diode is off when Vi + 2 > 0.

3. Determine the output waveform from the given circuit and input waveform.
The output waveform from the given circuit & input waveform is D
a)
Find the waveform for V1 lt 4 the diode is on otherwise its off - option a
b)
Find the waveform for V1 lt 4 the diode is on otherwise its off - option b
c)
Find the waveform for V1 lt 4 the diode is on otherwise its off - option c
d)
Find the waveform for V1 lt 4 the diode is on otherwise its off - option d
View Answer

Answer: d
Explanation: For V1 < 4 the diode is on otherwise its off.
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4. Find the waveform graph for the given circuit diagram
a)
Positive half cycle when Vi lt 8 both diodes are off, D1 is ono - option a
b)
Positive half cycle when Vi lt 8 both diodes are off, D1 is ono - option b
c)
Positive half cycle when Vi lt 8 both diodes are off, D1 is ono - option c
d)
Positive half cycle when Vi lt 8 both diodes are off, D1 is ono - option d
View Answer

Answer: c
Explanation: During +ve half cycle when Vi < 8 both the diodes are off. For V1 > 8, D1 is on. Similarly for the negative half cycle.

5. The maximum load current that can be drawn is
The maximum load current that can be drawn is 1.4 mA
a) 1.4 mA
b) 2.3 mA
c) 1.8 mA
d) 2.5 mA
View Answer

Answer: a
Explanation: At regulated poer supply, Is = 30-9/15k or 1.4 mA. The load current will remain less than this current.
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6. For the circuit shown diode cutting voltage is Vin = 0. The ripple voltage is to be no more than vrip = 4 V. The minimum load resistance, that can be connected to the output is (in kilo ohm)
Find minimum resistance connected to output if ripple voltage be no more than vrip is 4 V
a) 6.25
b) 12.5
c) 25
d) 30
View Answer

Answer: a
Explanation: The minimum load resistance, that can be connected to the output is 6.25

7. The circuit inside the box in fig. P3.1.31. contains only resistor and diodes. The terminal voltage vo is connected to some point in the circuit inside the box. The largest and smallest possible value of vo most nearly to is respectively
The largest & smallest possible value of vo most nearly to is 15 V & 9 V
a) 15 V, 6 V
b) 24 V, 0 V
c) 24 V, 6 V
d) 15 V, 9 V
View Answer

Answer: d
Explanation: The output voltage cannot exceed the positive power supply voltage and cannot be lower than the negative power supply voltage.
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8. The Q-point of the zener diode in the circuit shown below is
Find Q-point of the zener diode in the circuit shown
a) (0.34 mA, 4 V)
b) (0.34 mA, 4.93 V)
c) (0.94 mA, 4 V)
d) (0.94 mA, 4.93 V)
View Answer

Answer: a
Explanation: The Q-point of the zener diode in the circuit shown below is 0.34 mA & 4 V

Sanfoundry Global Education & Learning Series – Electronic Devices and Circuits.

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

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
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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