Electroluminescence forward biased silicon diodes give off heat as electron and holes from the ntype and ptype regions, respectively, recombine at the junction. Semiconductor electronics important questions for cbse class 12 physics semiconductor, diode and its application 4. Special purpose diode mcq based short questions and. Special purpose diodes questions and answers electronics.
A diode is a twoterminal electronic component that conducts current primarily in one direction. General purpose diodes, signal diodes, schottky barrier diodes, germanium diode, fast recovery diode, 1n4001, 1n4004, 1n4148, 1n34a. Microsoft powerpoint special purpose diodes readonly author. Think of the depletion region a variable dielectric. Pin diodes are used in place of switching diodes in radio frequency rf applications, for example, a tr switch. Zener diode is a pn junction diode specially designed for operation in the breakdown region in reverse bias condition. Specialpurpose diodes diodes and rectifiers electronics textbook. It is a special purpose diode, named after the inventor c. This is the multiple choice questions in chapter 5. In this section of electronic devices and circuits special purpose diode mcq based short questions and answers,we have tried to cover the below lists of topic.
A varactor is a diode that always operates in reversebiase and is doped to maximize the inherent capacitance of the depletion region. Also known as hotcarrier diodes, schottky diodes are characterized by fast switching times low reverse recovery time, low forward voltage drop typically 0. Overview of various types of diodes and their applications. Pin diodes are used in place of switching diodes in radio frequency rf applications, for example, a tr switch here. The backward diode is a pnjunction diode that is similar to the tunnel diode in its process. Two things happen when the reverse breakdown voltage vbr is reached. Other versions of diodes are constructed in a similar way using the same principles but. We will cover zener diode and optoelectronic junction devices including. The function of the diode is regulating the voltage at a particular current. Write down all circuit equations and simplify as much as possible 2. Lets look at some pn junction diodes, developed for specific applications.
Special purpose diodes questions and answers pdf free download for electronics engineering students,mcqs,objective type interview questions viva lab manuals skip to content engineering interview questions,mcqs,objective questions,class notes,seminor topics,lab viva pdf free download. Ppt special purpose diodes powerpoint presentation. Fast recovery epitaxial diodes fred characteristics applications examples. The 1n4007 v, 1 a general purpose power diode is reported to be useable as a pin switching diode. Specialpurpose diodes 127 almost the entire energy is given up in the form of heat and emitted light is insignificant. Zener diodes vericap varactor diodes variable capacitance diode optical diodes i light emitting diode led ii ph slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. It is designed to operate under reverse bias in the breakdown region. The 1n4007 v, 1 a general purpose power diode is reported to be usable as a pin switching diode. Schottky diodes are constructed of a metalton junction rather than a pn semiconductor junction. A diode intentionally designed to glow like a lamp is called a lightemitting diode, or led. Pdf diodes are electronic components functions as a oneway valve it means it allow current. This is a special type of diode in which a pn junction is replaced by a metal semiconductor junction. Recipe for solving diode circuits state of diode is unknown before solving the circuit 1.
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. Et212 electronics special purpose diodes floyd 20 22 varactor diodes a varactor diode is best explained as a variable capacitor. Special diodes worksheet discrete semiconductor devices. Energy band in a crystal due to interatomic interaction, valence electrons of one atom are shared by more than one atom in the crystal. This combination has no depletion region between them. Read the most frequently asked 50 top special purpose diodes interview questions and answers for freshers and experienced pdf special purpose diodes interview questions and answers list 1.
General purpose diodes smdsmt diodes general purpose. Some of the more common specialpurpose diodes are i zener diode. Special purpose diodes from the book electronic principles 7th edition by albert malvino. It finds a few special applications where its specific properties can be. Special purpose diodes free download as powerpoint presentation. But other than these, there are few prominent diodes, which have got many applications. Various types of special purpose diode and their application. Photo diodes,schottky diode,constant current diode mcqs. The ptype semiconductor in a normal pn junction diode is replaced by a metal and ntype material is joined to the metal. Generally diodes are used as reverse polarity protector and transient protector. The diodes designed to work in breakdown region are called zener diode. If positive potential is applied to the top terminal as shown in fig. In silicon diode, the dark band indicates the cathode terminal and the other terminal is anode. There are many of such kinds like transient voltage suppression diodes, gold doped diodes, super barrier diodes, point contact diodes, peltier diodes etc.
General purpose diodes smdsmt diodes general purpose, power, switching are available at mouser electronics. Faculty of electrical electronic engineering, kuktem. Diodes are electronic components functions as a oneway valve it means it allow current to flow in one direction. Basic electronics special purpose diodes tutorialspoint. What is the purpose of students taking your course.
There is a special type of diode called a varactor, which is used to create a voltagedependent capacitance. Diodes are originally used to rectify ac current into dc current. The depletion region, widened by the reverse bias, acts as a capacitor dielectric because of its nonconductive characteristics. Special functions diodes incorporateds special function ics are products that fall outside of the usual power management and standard linear families. There are many of such kinds like transient voltage suppression diodes, gold doped. Mcq in special purpose diodes pinoybix engineering. The basic function of zener diode is to maintain a specific voltage across its terminals within given limits of line or load change.
Objectives describe the characteristics of a zener diode and analyze its operation explain how a zener is used in voltage regulation and limiting describe the varactor diode and its variable capacitance characteristics discuss the operation and characteristics of leds and photodiodes discuss the basic characteristics of the current regulator diode, the pin diode, the. However, in materials like gallium arsenide, the number of photons of light energy is sufficient to produce quite intense visible light. Use the diode equation for that state to solve the circuit equations and find i d and v d 3. If the reverse voltage exceeds the breakdown voltage, the zener diode will normally not be destroyed as long as the current does not. Top list of types of diodes and their applications zener, light emitting.
Special diodes discrete semiconductor devices and circuits pdf version. Operation of diode can be classified in two ways, if it allows the current then it is forward biased otherwise it is reverse biased. Cbse ncert notes class 12 physics semiconductor electronics. There are few diodes which are designed to serve some special purposes. Zener diode is a silicon pn junction device that differ from rectifier diodes because it is designed for operation in the reverse breakdown region. Semiconductor diode 7 sequential circuit 3 short questions and answers 15 signal processing 3 sinusoidal oscillator 3 special purpose diodes 1 switching circuits 2 tech 16 tech news 2 transistor 10 triac 1 uncategorized 8 vlsi design 5 voltage regulator 11 voltage stabilizer 1 voltage stabilizer 1 waveform coding.
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