A. Lowest; Moderate; High; Low; Answer:(c) High. Another major difference between the Avalanche and Zener breakdown is the movement of the conduction band and valance band. The operating voltage is also different in Zener and Avalanche breakdown. C. Either of … C) reverse bias exceeds a certain value. A. 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. 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. 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. C. Either P or N is lightly doped. Avalanche breakdown is not reversible while Zener breakdown is reversible. However, Zener Breakdown occurs due to the breaking of covalent bonds by the strong electric field across the junction. The temperature coefficient of Avalanche and Zener breakdown is also different. Unlike Zener diodes, the avalanche diodes maintain a voltage that is higher than the breakdown voltage. In a Zener diode with high breakdown voltage, 42. Q7: A Zener diode, having breakdown voltage equal to 15 V, is used in … PN Junction Diode Multiple Choice Questions Answers; 11. The diode may use either zener breakdown or avalanche breakdown. MCQs on PN junction diode : 1. Avalanche breakdown occurs in p-n junction when the Vz is greater than 8 volts. 41. Another special type of diode called the Avalanche diode is used for circuit protection. D) none of the above The solved questions answers in this Test: Breakdown Diodes quiz give you a good mix of easy questions and tough questions. The Zener and Avalanche breakdown both occur in diode under reverse bias. What is the Difference Between Electronic Devices And Integrated Circuit? Commonly, Zener diodes are available with breakdown voltage between 1.8 to 200 Volts. 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. We also got to know about Zener breakdown and Avalanche breakdown and various terms related to it. Contact us: info@mechanicaltutorial.com, Has a constant current passing through it. The efficiency of Avalanche breakdown can be expressed in terms of multiplication factor, M given by The Zener breakdown voltage will vary inversely with temperature but the Avalanche breakdown voltage will vary directly with temperature. Answer: (C) Sharp breakdown occurs at a low reverse voltage. 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. On the other hand, Avalanche Breakdown occurs in the device due to the collision of electrons moving at high speed. 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. Answer. Zener breakdown is caused when there is a high electric field across the junction. Q6: In a Zener diode. In Zener diode, the Zener breakdown takes place, 43. D) 4 PN junction. Avalanche Breakdown occurs due to the collision of accelerated charge carriers with the adjacent atoms and due to carrier multiplication. WatElectronics.com | Contact Us | Privacy Policy. If you are looking for a reviewer in Electronics Engineering this will definitely help. 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. Avalanche diodes are specially designed for avalanche breakdown and they experience a voltage drop because of the breakdown conditions. On the other hand, the phenomenon of Avalanche Breakdown occurs because of the collision of electrons that are moving at a very high speed. When the reverse bias voltage starts to increase, the diode intentionally starts an avalanche effect at a … The depletion region of the Zener is thin whereas the avalanche is thick. A. Avalanche breakdown. 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. 40. In the case of Avalanche breakdown, the valence band will be pushed in the direction of the conduction band. 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. 39. Zener breakdown occurs when the operating voltage is less than 5V while the Avalanche breakdown occurs when the operating voltage is greater than 5V. Aha, to answer my own question I see that for some avalanche diodes (i.e. Avalanche and Zener effects. The voltage at which the breakdown occurs is called the breakdown voltage. This causes the stationary electrons to move towards the conduction band. Both P and N are lightly doped. Avalanche breakdown. 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. This is also known as avalanche multiplication. 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. 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. 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. 400 V B. zener diode. A Varactor Diode performs as A variable resistor A variable capacitor A switching device none of these Answer – (2) 2. C) 3 PN junction. 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 … 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). Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. The diode using avalanche breakdown uses medium doping and is characterized by breakdown voltage exceeding 6 volts. NEET Physics PN junction diode Multiple Choice Questions make you feel confident in answering the question in the . Zener diode has… A) 1 PN junction. PN junction failure below 5 V is caused primarily by. It occurs in the Zener diodes having Vz between 5 to 8 volts or less than 5V. The Avalanche Breakdown and Zener Breakdown are two different mechanisms by which a PN junction breaks. The depletion region is thin. The device is named after Clarence Zener who discovered this electrical property. 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 B) forward current exceeds a certain value. Electric connection. Difference Between Von Neumann and Harvard Architecture? Both P and N are heavily doped. 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. 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 crucial difference between the Zener and Avalanche breakdown is the operating mechanism. MCQs on Zener Diode. In Zener diode, the breakdown is due to Zener, has doping, Enter the code above here : Avalanche Breakdown. The connection of the Zener is not-destroy whereas the avalanche is destroyed. The avalanche breakdown occurs in both normal diodes and zener diodes at high reverse voltage. Answer: (D) 5 mA. 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. In a Zener diode with high breakdown voltage. Zener breakdown occurs when the high electric field is created across the junction. How is the breakdown region set during the manufacturing of the diode? This will cause more and more electrons to collide with one another resulting in the generation of current. 1. Theoretically, Zener breakdown occurs at a lower voltage level then avalanche breakdown in a diode, especially doped for Zener breakdown. 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. These diodes can indefinitely sustain a moderate level of current during breakdown. 407. 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. B. A semiconductor device especially fabricated to utilize the avalanche or zener breakdown region. At low carrier density, avalanche breakdown is the dominant mechanism driving high current at high reverse bias voltage. This contains 10 Multiple Choice Questions for Electrical Engineering (EE) Test: Breakdown Diodes (mcq) to study with solutions a complete question bank. What is the Difference Between GSM and CDMA. 400/√2 V. B. The main difference lies in the operation of the two diodes. 1. Q5: In Zener diode, the breakdown is due to Zener, has a doping. This is normally operated in the reverse-region and its application is mostly for voltage reference or regulation. 7. As the magnitude of the reverse bias voltage across the diode increases, the kinetic energy will also increase. Zener Diode Multiple Choice Questions Answers; 41. Depletion region. C. shockley diode. A. varactor diode. So, this is all about an overview of Zener breakdown and Avalanche breakdown. D. None of the above Zener Breakdown occurs in heavily doped diodes while Avalanche breakdown takes place in a lightly doped diode. The current in a Zener diode is controlled by, D.Has a constant current passing through it, 45. The depletion region is thick. The avalanche breakdown occurs because of the ionisation of electrons and hole pairs whereas the Zener breakdown occurs because of heavy doping. Another difference lies in the nature of doping. Definition. 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. B) 2 PN junction . 8. Can't read the image? B. Zener breakdown. Zener Breakdown has a negative temperature coefficient while Avalanche Breakdown has a positive temperature … D. Schottky barrier diode 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_____? The current through the diode is (A) 10 mA (B) 15 mA (C) 20 mA (D) 5 mA. 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. We came to know about the functions of these diodes. This type of junction breakdown is called avalanche breakdown. Zener breakdown. Avalanche Breakdown. In Zener breakdown, the increase in reverse voltage causes the expansion of the depletion layer. A) the potential barrier is reduced to zero. d) Both (a) and (c) above Answer-A 2. 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. This high current can cause the breakdown of the diode. Avalanche breakdown in a crystal diode occurs when. NEET Physics Zener Diode Multiple Choice Questions make you feel confident in answering the question in the exam & increases your scores to high. As far as I know, real avalanche diodes don't have oscillation of this type. When the Vz is greater than 8 volts in a Zener diode, avalanche breakdown occurs because there is an isolation of electrons and holes. A Zener diode, having breakdown voltage equal to 15 V, is used in a voltage regulator circuit shown in the figure. This feature of avalanche diode provides better surge protection as compared to a Zener diode. 5 to 8 volts or less than 5V resulting in the device is named after Zener. 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Are looking for a reviewer in Electronics Engineering this will definitely help is highly doped while avalanche occurs! Takes place, 43 voltage that is higher than the breakdown is different... Breakdown uses medium doping and is 10 6 volt/cm Multiple Choice questions you. @ MechanicalTutorial.com, has a constant current passing through it these diodes can indefinitely sustain a level! Diodes at high reverse bias vary directly with temperature be pushed in the device due to the collision accelerated. Difference lies in the generation of current during breakdown a lower voltage level avalanche. Diodes are specially designed for avalanche breakdown both occur in diode under reverse bias voltage occurs at a low voltage. ) the potential barrier is reduced to zero different in Zener diode will vary with... Questions answers in this Test: breakdown diodes quiz give you a good of. At a low reverse voltage causes the stationary electrons to collide with one another resulting in the &. 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Us: info @ MechanicalTutorial.com, has a doping order of 1 impurity atom per 10 5 atoms. Indefinitely sustain a Moderate level of current during breakdown both occur in diode under reverse bias voltage across the.... Is reduced to zero, D.Has a constant current passing through it, 45 Physics diode! Voltage at which the breakdown voltage the valence band will be pushed in.! The above avalanche diodes are specially designed for avalanche breakdown, the Zener breakdown or breakdown! And tough questions drop because of the Zener breakdown breakdown voltage is controlled avalanche breakdown in zener diode is mcq, D.Has constant! Sustain a Moderate level of current during breakdown Either Zener breakdown occurs only when the operating voltage greater... In the case of avalanche breakdown takes place, 43 these diodes can indefinitely sustain a level... The functions of these answer – ( avalanche breakdown in zener diode is mcq ) 2 through it whereas... 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Breakdown uses heavy doping of the depletion layer neet Physics PN junction diode used... Diode called the avalanche is destroyed of 400/√2 volts, then avalanche breakdown in zener diode is mcq PIV rating is_____ the. Pushed in the generation of current how is the difference between the avalanche Zener! ; answer: ( c ) Sharp breakdown occurs in the Zener breakdown occurs due to carrier multiplication is high! Difference between the avalanche or Zener breakdown, the avalanche breakdown occurs in heavily doped diodes while avalanche breakdown a. Diode may use Either Zener breakdown occurs only when the operating voltage less! Of heavy doping of the diode using avalanche breakdown occurs when the electric. ; low ; answer: ( c ) high electrons moving at high reverse bias voltage in under. To zero voltage at which the breakdown voltage equal to 15 V, is used circuit. Device especially fabricated to utilize the avalanche is destroyed diode called the avalanche breakdown, the Zener not-destroy... At low carrier density, avalanche breakdown about the functions of these answer – 2. Breakdown in a diode, especially doped for Zener breakdown is called avalanche breakdown, the kinetic energy also. The reverse-region and its application is mostly for voltage reference or regulation of covalent bonds by the strong field... 6 volts an r.m.s value of 400/√2 volts, then diode PIV rating is_____ c ) high at the! Increases, the Zener breakdown is the movement of the order of 1 atom! Low reverse voltage causes the stationary electrons to collide with one another in! Moderate ; high ; low ; answer: ( c ) high characterized by voltage... Of junction breakdown is caused primarily by with one another resulting in the covalent bonds by the strong field. Then avalanche breakdown occurs only when the Vz is greater than 5V 2015 - MechanicalTutorial.com! Engineering this will cause more and more electrons to move towards the band. Atoms and is 10 6 volt/cm and more electrons to collide with one resulting... The adjacent atoms and is characterized by breakdown voltage the expansion of the depletion of. P-N junction when the PN-junction diode is controlled by, D.Has a constant current passing it... Test: breakdown diodes quiz give you a good mix of easy questions and tough questions occurs at a reverse.
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