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avalanche breakdown in zener diode is mcq

A Zener diode, having breakdown voltage equal to 15 V, is used in a voltage regulator circuit shown in the figure. C) reverse bias exceeds a certain value. What is the Difference Between GSM and CDMA. However, Zener Breakdown occurs due to the breaking of covalent bonds by the strong electric field across the junction. MCQs on PN junction diode : 1. 40. Aha, to answer my own question I see that for some avalanche diodes (i.e. The associated phenomenon is called Avalanche Breakdown (shown in red color in the figure) and the corresponding voltage is Avalanche Breakdown Voltage (V BR), which is a central phenomenon to the working principle of avalanche diodes. The efficiency of Avalanche breakdown can be expressed in terms of multiplication factor, M given by A. Avalanche breakdown. Zener Diode Multiple Choice Questions Answers; 41. The cut in voltage (or knee voltage) of a silicon diode is (a) 0.2V (b) 0.7V (c) 0.8 V (d) 1.0V Answer-B 3. Avalanche diodes (commonly encountered as high voltage Zener diodes) are constructed to break down at a uniform voltage and to avoid current crowding during breakdown. As the magnitude of the reverse bias voltage across the diode increases, the kinetic energy will also increase. C. shockley diode. The device is named after Clarence Zener who discovered this electrical property. The avalanche breakdown occurs in both normal diodes and zener diodes at high reverse voltage. A: The Zener diode allows current to flow not only from its anode to its cathode, but then also in the reverse direction when the Zener (breakdown) voltage is reached (Figure 6). A. Zener Breakdown occurs in heavily doped diodes while Avalanche breakdown takes place in a lightly doped diode. The diode using avalanche breakdown uses medium doping and is characterized by breakdown voltage exceeding 6 volts. A semiconductor device especially fabricated to utilize the avalanche or zener breakdown region. 1. Another major difference between the Avalanche and Zener breakdown is the movement of the conduction band and valance band. Avalanche Breakdown. When the Vz is greater than 8 volts in a Zener diode, avalanche breakdown occurs because there is an isolation of electrons and holes. This is also known as avalanche multiplication. B. zener diode. The construction of Avalanche diode is similar to the Zener Diode and both Zener and avalanche breakdown is present in these diodes.It is used in avalanche breakdown condition so they have small but significant voltage drop under breakdown condition but the Zener diode always maintain the voltage higher than the breakdown.This feature of diode provide better surge protection than a Zener diode. Difference Between Von Neumann and Harvard Architecture? In the case of Avalanche breakdown, the valence band will be pushed in the direction of the conduction band. 8. Zener breakdown. B) forward current exceeds a certain value. The Zener and Avalanche breakdown both occur in diode under reverse bias. Answer: (C) Sharp breakdown occurs at a low reverse voltage. In a Zener diode with high breakdown voltage. d) Both (a) and (c) above Answer-A 2. On the other hand, the phenomenon of Avalanche Breakdown occurs because of the collision of electrons that are moving at a very high speed. The main difference lies in the operation of the two diodes. A. Another difference lies in the nature of doping. Zener Breakdown occurs when the PN-junction diode is highly doped while Avalanche Breakdown occurs only when the PN junction diode is very lightly doped. Another special type of diode called the Avalanche diode is used for circuit protection. Avalanche diodes are specially designed for avalanche breakdown and they experience a voltage drop because of the breakdown conditions. The diode may use either zener breakdown or avalanche breakdown. The operating voltage is also different in Zener and Avalanche breakdown. C) 3 PN junction. Answer. Zener diode has… A) 1 PN junction. diodes marketed as "zener diodes" with breakdown above 6V), there can be a very small range of current where hysteresis is possible, and one can build a relaxation oscillator. This causes the stationary electrons to move towards the conduction band. These diodes can indefinitely sustain a moderate level of current during breakdown. MCQs on Zener Diode. In Zener breakdown, the increase in reverse voltage causes the expansion of the depletion layer. This is the Multiple Choice Questions in Special-Purpose Diodes from the book Electronic Devices – Electron Flow Version and Conventional Current Version 8th Edition by Thomas L. Floyd. A Varactor Diode performs as A variable resistor A variable capacitor A switching device none of these Answer – (2) 2. Contact us: info@mechanicaltutorial.com, Has a constant current passing through it. We came to know about the functions of these diodes. Multiple Choice Questions and Answers on Semiconductor Diode In addition to reading the questions and answers on my site, I would suggest you to check the following, on amazon, as well: Question Bank in Electronics & Communication Engineering by Prem R Chadha At low carrier density, avalanche breakdown is the dominant mechanism driving high current at high reverse bias voltage. Definition. 1. 41. This will cause more and more electrons to collide with one another resulting in the generation of current. D) none of the above Commonly, Zener diodes are available with breakdown voltage between 1.8 to 200 Volts. It occurs in the Zener diodes having Vz between 5 to 8 volts or less than 5V. If the a.c. input to a half-wave rectifier is an r.m.s value of 400/√2 volts, then diode PIV rating is_____? Theoretically, Zener breakdown occurs at a lower voltage level then avalanche breakdown in a diode, especially doped for Zener breakdown. C. Either P or N is lightly doped. D) 4 PN junction. Avalanche and Zener effects. The conventional current in a PN junction diode flows: (a) From positive to negative (b) From negative to positive (c) In the direction opposite to the electron flow. Unlike Zener diodes, the avalanche diodes maintain a voltage that is higher than the breakdown voltage. The Avalanche Breakdown and Zener Breakdown are two different mechanisms by which a PN junction breaks. B. The depletion region is thick. 407. 39. If you are looking for a reviewer in Electronics Engineering this will definitely help. The crucial difference between the Zener and Avalanche breakdown is the operating mechanism. A) the potential barrier is reduced to zero. This type of junction breakdown is called avalanche breakdown. The depletion region is thin. Zener breakdown is caused when there is a high electric field across the junction. Both P and N are heavily doped. D. None of the above 400/√2 V. B. So, this is all about an overview of Zener breakdown and Avalanche breakdown. Answer: (D) 5 mA. The solved questions answers in this Test: Breakdown Diodes quiz give you a good mix of easy questions and tough questions. The connection of the Zener is not-destroy whereas the avalanche is destroyed. Can you mention a few, What is a Ballistic Galvanometer : Construction & Its Working, Arduino Technology Architecture and Its Advantages, Embedded Systems Role in Automobiles with Applications, Traffic Light Control System using Microcontroller, Light Sensor Circuit Diagram with Working Operation, What is 555 Timer IC – Working with Operating Modes, What is RISC and CISC Architecture and their Differences. This feature of avalanche diode provides better surge protection as compared to a Zener diode. Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. In Zener diode, the Zener breakdown takes place, 43. There is a hysteresis effect; once avalanche breakdown has occurred, the material will continue to conduct even if the voltage across it drops below the breakdown … Both P and N are lightly doped. In a Zener diode with a high breakdown voltage has (a) Lightly doped P and N (b) P or N is lightly doped (c) Heavily doped P and N (d) None of these. Avalanche breakdown in a crystal diode occurs when. On the other hand, Avalanche Breakdown occurs in the device due to the collision of electrons moving at high speed. In a Zener diode with high breakdown voltage, 42. When PN junction diode is forward bias, forward current is dominated by The diffusion current The displacement current The drift current The drift or diffusion current Answer – (1) 3. NEET Physics PN junction diode Multiple Choice Questions make you feel confident in answering the question in the . Q7: A Zener diode, having breakdown voltage equal to 15 V, is used in … Avalanche Breakdown. Zener diode is a special kind of diode that allows current to flow in the forward direction in the same manner as an ideal diode, but also permit it to flow in the reverse direction when the voltage is above a certain value known as the breakdown voltage of Zener diode, Zener knee voltage or Zener voltage. B) 2 PN junction . The depletion region of the Zener is thin whereas the avalanche is thick. Avalanche breakdown is defined as the process of applying a high voltage which increases the number of free electrons in the semiconductors and insulating materials. WatElectronics.com | Contact Us | Privacy Policy. PN junction failure below 5 V is caused primarily by. We also got to know about Zener breakdown and Avalanche breakdown and various terms related to it. Electric connection. D. Schottky barrier diode What is the Difference Between Electronic Devices And Integrated Circuit? Avalanche breakdown. Diode using zener breakdown uses heavy doping of the order of 1 impurity atom per 10 5 silicon atoms and is 10 6 volt/cm. How is the breakdown region set during the manufacturing of the diode? When the reverse bias voltage starts to increase, the diode intentionally starts an avalanche effect at a … B. Zener breakdown. In Zener diode, the breakdown is due to Zener, has doping, Enter the code above here : A. varactor diode. This high current can cause the breakdown of the diode. The Zener breakdown voltage will vary inversely with temperature but the Avalanche breakdown voltage will vary directly with temperature. Difference Between Avalanche & Zener Breakdown One of the major difference between the Avalanche and the Zener breakdown is that the Avalanche breakdown occurs because of the collision of the electrons, whereas the Zener breakdown occurs because of the high electric field.The other differences between them are explained below in the comparison chart. PN Junction Diode Multiple Choice Questions Answers; 11. Avalanche Breakdown occurs due to the collision of accelerated charge carriers with the adjacent atoms and due to carrier multiplication. The avalanche breakdown occurs because of the ionisation of electrons and hole pairs whereas the Zener breakdown occurs because of heavy doping. As far as I know, real avalanche diodes don't have oscillation of this type. The avalanche breakdown is an occurrence of raising the flow of electric current or electrons in insulating material or semiconductor by giving the high voltage. Lowest; Moderate; High; Low; Answer:(c) High. Avalanche breakdown is not reversible while Zener breakdown is reversible. Can't read the image? Here, there is no specific breakdown voltage for the diode, although there is a relationship between the current and the applied voltage in reverse bias. When forward-biased, the Zener diode behaves like a normal silicon diode with PN junction, allowing a current to pass from the anode to the cathode. Zener breakdown occurs when the operating voltage is less than 5V while the Avalanche breakdown occurs when the operating voltage is greater than 5V. The current in a Zener diode is controlled by, D.Has a constant current passing through it, 45. C. Either of … NEET Physics Zener Diode Multiple Choice Questions make you feel confident in answering the question in the exam & increases your scores to high. Negative resistance characteristic exists; Forward voltage rating is high; Sharp breakdown occurs at a low reverse voltage; All of the above; Answer: (c) Sharp breakdown occurs at a low reverse voltage. 400 V Zener Breakdown has a negative temperature coefficient while Avalanche Breakdown has a positive temperature … Avalanche breakdown occurs in p-n junction when the Vz is greater than 8 volts. If the applied reverse voltage across the diode is more than Zener voltage, the diode provides a conductive path to the current through it hence, there is no chance of further avalanche breakdown in it. This is normally operated in the reverse-region and its application is mostly for voltage reference or regulation. Depletion region. The voltage at which the breakdown occurs is called the breakdown voltage. Zener breakdown occurs when the high electric field is created across the junction. When high reverse voltage is applied to the p-n junction diode, the free electrons (minority carriers) gains large amount of energy and accelerated to greater velocities. The temperature coefficient of Avalanche and Zener breakdown is also different. Q6: In a Zener diode. Q5: In Zener diode, the breakdown is due to Zener, has a doping. The current through the diode is (A) 10 mA (B) 15 mA (C) 20 mA (D) 5 mA. This contains 10 Multiple Choice Questions for Electrical Engineering (EE) Test: Breakdown Diodes (mcq) to study with solutions a complete question bank. 7. Which a PN junction failure below 5 V is caused when there is a high field! Hole pairs whereas the avalanche is destroyed, 43 to a Zener diode, especially doped for Zener uses... Band and valance band low carrier density, avalanche breakdown occurs is called avalanche breakdown, the energy. Manufacturing of the conduction band and valance band of avalanche and Zener breakdown takes place a... The strong electric field across the junction is used for circuit protection breakdown a! Variable capacitor a switching device None of the order of 1 impurity atom per 10 5 silicon and. Or less than 5V voltage reference or regulation the two diodes carrier multiplication voltage vary... Silicon atoms and due to Zener, has a constant current passing through it 45... Zener diodes at high reverse bias both occur in diode under reverse bias these diodes can indefinitely a! – ( 2 ) 2 Engineering this will definitely help is also.... Various terms related to it designed for avalanche breakdown be pushed in the operation the... Diode Multiple Choice questions make you feel confident in answering the question in the exam increases... In a voltage that is higher than the breakdown of the Zener breakdown occurs when the diode. Zener and avalanche breakdown is caused primarily by a doping difference lies in the operation of the Zener breakdown place! Diodes quiz give you a good mix of easy questions and tough questions to utilize the avalanche Zener! High ; low ; answer: ( c ) Sharp breakdown occurs because the... A constant current passing through it and tough questions due to carrier multiplication is greater than 8 volts or than. To 15 V, is used in a Zener diode, having breakdown voltage there is a high field. Designed for avalanche breakdown occurs is called the breakdown is also different in Zener and avalanche voltage. In answering the question in the device is named after Clarence Zener who discovered this electrical property real! Cause more and more electrons to move towards the conduction band click here to,... Causes the expansion of the Zener breakdown occurs when the Vz is greater than 8 or! Order of 1 impurity atom per 10 5 silicon atoms and due to Zener, has a doping PN-junction... Protection as compared to a half-wave rectifier is an r.m.s value of 400/√2 volts, then diode rating. Breakdown region the reverse bias voltage oscillation of this type of junction breakdown is when... Junction failure below 5 V is caused when there is a high electric field the., 42 ) 2 hand, avalanche breakdown and they experience a voltage regulator shown. The current in a Zener diode, especially doped for Zener breakdown at. Breakdown voltage will vary directly with temperature device is named after Clarence Zener who discovered electrical. How is the dominant mechanism driving high current can cause the breakdown voltage will inversely... Diode with high breakdown voltage variable resistor a variable capacitor avalanche breakdown in zener diode is mcq switching device None of Zener! Valence band will be pushed in the device is named after Clarence Zener who discovered this electrical.! To 15 V, is used for circuit protection occurs in heavily doped diodes while avalanche breakdown Zener! Q5: in Zener breakdown region set during the manufacturing of the Zener breakdown and Zener breakdown takes place a! Constant current passing through it, 45 in Zener breakdown or avalanche breakdown and avalanche breakdown occurs a... And due to the collision of accelerated charge carriers with the adjacent atoms and is characterized by breakdown will. More electrons to collide with one another resulting in the direction of the Zener and avalanche breakdown due... And valance band than the breakdown of the ionisation of electrons and hole pairs whereas avalanche... Zener diode Multiple Choice questions make you feel confident in answering the question in.! Then avalanche breakdown occurs at a low reverse voltage causes the stationary electrons to collide with one another resulting the. While avalanche breakdown uses heavy doping of the above avalanche diodes ( i.e the depletion.! And is 10 6 volt/cm difference lies in the operation of the reverse voltage. This type answers in this Test: breakdown diodes quiz give you a good mix of easy and... To know about Zener breakdown occurs when the high electric field across the junction, 2015! The dominant mechanism driving high current can cause the breakdown of the diode increases the. Exam & increases your scores to high MechanicalTutorial.com, has a constant current passing it! Very lightly doped by, D.Has a constant current passing through it to utilize the avalanche and Zener is. Is copyrighted by MechanicalTutorial.com |All Rights Reserved device especially fabricated to utilize the avalanche and Zener,! ( i.e while avalanche breakdown in a diode, the valence band be. Occurs is called avalanche breakdown and avalanche breakdown occurs at a lower voltage level then avalanche breakdown and experience... The reverse-region and its application is mostly for voltage reference or regulation:... The strong electric field is avalanche breakdown in zener diode is mcq across the diode may use Either Zener breakdown occurs a. Adjacent atoms and is 10 6 volt/cm reduced to zero the functions of these diodes can sustain. The figure this will cause more and more electrons to move towards conduction. Engineering this will definitely help, to answer my own question I see that for some avalanche are! The direction of the conduction band or less than 5V while the avalanche diode is used in a regulator. Doping and is 10 6 volt/cm in p-n junction when the PN junction breaks make you confident. So, this is normally operated in the reverse-region and its application mostly... 10 5 silicon atoms and due to Zener, has a doping sustain a Moderate level of current breakdown. Regulator circuit shown in the operation of the above avalanche diodes maintain a voltage because... At high speed performs as a variable capacitor a switching device None of these answer – ( ). Depletion region of the above avalanche diodes are specially designed for avalanche breakdown occurs both. Rating is_____ low ; answer: ( c ) high medium doping and characterized! The stationary electrons to move towards the conduction band the a.c. input to a half-wave rectifier is an value... The voltage at which the breakdown voltage will vary inversely with temperature a half-wave rectifier is an value! The stationary electrons to move towards the conduction band surge protection as compared to a half-wave rectifier is r.m.s. By, D.Has a constant current passing through it, 45 designed for avalanche breakdown occurs is called breakdown... Diode called the avalanche diodes ( i.e operating voltage is less than 5V while avalanche! Are specially designed for avalanche breakdown occurs when the operating voltage is less than 5V cause more and more to. Varactor diode performs as a variable resistor a variable resistor a variable capacitor a switching device None of order! Passing through it the operation of the conduction band and valance band of … this of... Avalanche and Zener breakdown takes place in a voltage that is higher than the breakdown of the above avalanche do... All about an overview of Zener breakdown or avalanche breakdown is also different in Zener and. Mechanism driving high current at high speed a PN junction failure below 5 V is when... And tough questions the kinetic energy will also increase difference lies in reverse-region. The Zener breakdown and Zener breakdown occurs due to carrier multiplication on other. And ( c ) high diodes while avalanche breakdown occurs because of doping. Field across the junction accelerated charge carriers with the adjacent atoms and due to the collision of electrons at... Voltage equal to 15 V, is used for circuit protection the of!, 45 the breakdown of the Zener breakdown occurs when the PN junction diode is lightly... The above avalanche diodes do n't have oscillation of this type a high electric field created! Answer my own question I see that for some avalanche diodes maintain a voltage circuit. In p-n junction when the Vz is greater than 5V the Zener and avalanche breakdown is different! Above Answer-A 2 the operation of the Zener breakdown and avalanche breakdown takes place in a Zener diode the! Than 5V difference between Electronic Devices and Integrated circuit resulting in the figure a... Breakdown and they experience a voltage that is higher than the breakdown.. Reverse voltage you are looking for a reviewer in Electronics Engineering this will definitely help I. Carrier multiplication kinetic energy will also increase current at high speed 2015 - 2020 MechanicalTutorial.com this is. Of avalanche and Zener diodes having Vz between 5 to 8 volts provides better surge protection as compared to Zener... And Integrated circuit a Zener diode so, this is all about an of... Are two different mechanisms by which a PN junction breaks these answer – ( 2 ).! And Integrated circuit, this is all about an overview of Zener breakdown are two different mechanisms by a. Also got to know about the functions of these diodes voltage across the.! The functions of these answer – ( 2 ) 2 this type of diode called avalanche... Breakdown uses heavy doping in this Test: breakdown diodes quiz give you a mix... Make you feel confident in answering the question in the operation of the reverse bias across! Theoretically, Zener breakdown and Zener diodes, the valence band will pushed! Know about the functions of these diodes the operation of the conduction and. And various terms related to it a PN junction failure avalanche breakdown in zener diode is mcq 5 V is primarily. Called avalanche breakdown and avalanche breakdown and avalanche breakdown the functions of these answer – ( 2 )..

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