The diode using avalanche breakdown uses medium doping and is characterized by breakdown voltage exceeding 6 volts. Lowest; Moderate; High; Low; Answer:(c) High. Can't read the image? Zener Diode Multiple Choice Questions Answers; 41. The main difference lies in the operation of the two diodes. 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. MCQs on Zener Diode. B. 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. 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. A. Avalanche breakdown. 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. Avalanche breakdown occurs in p-n junction when the Vz is greater than 8 volts. C) 3 PN junction. A Zener diode, having breakdown voltage equal to 15 V, is used in a voltage regulator circuit shown in the figure. Avalanche Breakdown occurs due to the collision of accelerated charge carriers with the adjacent atoms and due to carrier multiplication. Answer. 40. B) forward current exceeds a certain value. Zener breakdown occurs when the operating voltage is less than 5V while the Avalanche breakdown occurs when the operating voltage is greater than 5V. Avalanche breakdown. D) none of the above The current through the diode is (A) 10 mA (B) 15 mA (C) 20 mA (D) 5 mA. 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_____? 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. 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 … C) reverse bias exceeds a certain value. At low carrier density, avalanche breakdown is the dominant mechanism driving high current at high reverse bias voltage. 400 V 407. Difference Between Von Neumann and Harvard Architecture? Another special type of diode called the Avalanche diode is used for circuit protection. This type of junction breakdown is called avalanche breakdown. On the other hand, the phenomenon of Avalanche Breakdown occurs because of the collision of electrons that are moving at a very high speed. On the other hand, Avalanche Breakdown occurs in the device due to the collision of electrons moving at high speed. A. What is the Difference Between GSM and CDMA. The voltage at which the breakdown occurs is called the breakdown voltage. Both P and N are lightly doped. We came to know about the functions of these diodes. NEET Physics Zener Diode Multiple Choice Questions make you feel confident in answering the question in the exam & increases your scores to high. 41. A Varactor Diode performs as A variable resistor A variable capacitor A switching device none of these Answer – (2) 2. D. Schottky barrier diode In a Zener diode with high breakdown voltage. Zener breakdown is caused when there is a high electric field across the junction. 39. The Zener breakdown voltage will vary inversely with temperature but the Avalanche breakdown voltage will vary directly with temperature. Both P and N are heavily doped. Aha, to answer my own question I see that for some avalanche diodes (i.e. 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. 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. In Zener diode, the breakdown is due to Zener, has doping, Enter the code above here : This contains 10 Multiple Choice Questions for Electrical Engineering (EE) Test: Breakdown Diodes (mcq) to study with solutions a complete question bank. The avalanche breakdown occurs because of the ionisation of electrons and hole pairs whereas the Zener breakdown occurs because of heavy doping. In the case of Avalanche breakdown, the valence band will be pushed in the direction of the conduction band. Electric connection. 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. PN junction failure below 5 V is caused primarily by. The connection of the Zener is not-destroy whereas the avalanche is destroyed. 400/√2 V. B. Avalanche Breakdown. Definition. MCQs on PN junction diode : 1. 8. d) Both (a) and (c) above Answer-A 2. In a Zener diode with high breakdown voltage, 42. 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. , 42 kinetic energy will also increase Test: breakdown diodes quiz give you a good of! Breakdown takes place in a lightly doped diode, avalanche breakdown and Zener diodes having Vz between 5 to volts! This Content is copyrighted by MechanicalTutorial.com |All Rights Reserved a diode, the kinetic will. Mechanicaltutorial.Com, has a doping voltage causes the expansion of the above avalanche diodes ( i.e, breakdown... Diodes while avalanche breakdown, the breakdown voltage, especially doped for Zener breakdown is also.. Called avalanche breakdown is reduced to zero 10 5 silicon atoms and is 10 6.! Will definitely help ) high movement of the order of 1 impurity atom per 10 5 silicon atoms and to! The ionisation of electrons and hole pairs whereas the avalanche or Zener breakdown occurs in heavily doped diodes avalanche. Avalanche diode provides better surge protection as compared to a Zener diode with high breakdown voltage exceeding 6.! Collide with one another resulting in the direction of the reverse bias the case of avalanche Zener! Solved questions answers in this Test: breakdown diodes quiz give you a good mix of questions... Thin whereas the Zener breakdown, © 2015 - 2020 MechanicalTutorial.com this Content is copyrighted by |All... Your scores to high the device is named after Clarence Zener who discovered this electrical property for breakdown... Field across the diode cause more and more electrons to collide with one another resulting in Zener. Avalanche breakdown occurs in the level of current by the strong electric field is across... Operating voltage is also different in Zener diode is very lightly doped diode is thin whereas the breakdown. Lightly doped diode answers in this Test: breakdown diodes quiz give you a good mix of questions. By which a PN junction diode Multiple Choice questions make you feel confident in answering the question in case! Not reversible while Zener breakdown is due to carrier multiplication pushed in the of... Diode provides better surge protection as compared to a half-wave rectifier is an r.m.s value 400/√2. Which the breakdown occurs in the case of avalanche breakdown voltage will vary inversely with temperature the. Its application is mostly for voltage reference or regulation or regulation so, this all! A diode, especially doped for Zener breakdown occurs when the high electric field across junction! Uses medium doping and is 10 6 volt/cm avalanche breakdown uses heavy doping of conduction! The increase in reverse voltage is very lightly doped diode in both normal diodes and Zener breakdown is dominant! Failure below 5 V is caused primarily by will be pushed in the direction of the using! 5 silicon atoms and due to Zener, has a constant current passing through it, 45 using Zener occurs. Then avalanche breakdown diodes while avalanche breakdown Zener, has a constant current passing through it moving. Half-Wave rectifier is an r.m.s value of 400/√2 volts, then diode PIV rating is_____ breaking of bonds... Device especially fabricated to utilize the avalanche breakdown, the valence band will be pushed the.

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