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led viva questions with answers

To determine Planck’s Constant, we equate two energy. Recruit a friend to practice answering questions 6. 5. 75. Labels: Characteristics, physics viva questions, physics viva questions and answers, Transistor, Transistor Characteristics, viva, viva questions 26 comments: Unknown February 3, … Sources/Information Required to Explain/Understand the Experiment : 2. Due to the barrier potential of the depletion region  hole transition in valence band; p-region In semiconductor diode (as per V-I Characteristics) the current doesn’t flow in the beginning. Watu.exam_id = exam_id; Although LEDs produce significantly less heat than the light bulbs we have been used to over the past century, the heat they produce must be managed. 4. 01: What id difference between power and energy? 15. Q.2. In the context of electric circuits, energy (w) is related to power by the following relationship p = vi =dw/dt 2.Give the expression for the ripple factor of the HWR and FWR. Can we achieve the population inversion process in LED too? Please note that all materials don’t show the photoelectric effect and emission of radiation like in LED. if yes what is the condition for that? 10. Who discovered that radiation is in a discrete form of energy? asked a question related to SMPS; Depletion potential Tie your answers back to your skills and accomplishments The LED works on the principle of semiconductor diode, to flow the current from n to p-type semiconductor a minimum potential is required. When you will plot it for every LED you will observe that every LED starts with a specific value of the potential. var js, fjs = d.getElementsByTagName(s)[0]; Naturally, these answers can only be used as basic guidelines. CFL’s and fluorescent do contain a very small amount of mercury that needs to be disposed of correctly. What is the Red Color wavelength range? Need to test a developer's PHP skills, or have a PHP intreview coming up? 8051 Microcontroller Interview Questions & Answers. 5.  forward bias The below list covers 130+ important interview questions for Networking for freshers candidates as well as Networking interview questions for experienced. The name of these two are.  6.462607004 × 10-24 m2 kg / s exam_id = 22; A pure semiconductor completely free from impurities is called intrinsic semiconductor. Shri USB College of Engineering & Management Aburoad Experiment No:- 01 Objective:- Assemble house wiring including earthing for 1-phase energy meter, MCB, ceiling fan, tube light, three pin socket. 8. jQuery(function($){ Just see you have taken readings for each LED, either that one when LED starts to glow or also after it with some intervals of potential. A typical output of a solar cell is . ... ANSWER: (c) Integral lens LED. But to understand it you have to understand the energy band concept, this explanation is given in the semiconductor laser topic. It is a language by … Semiconductor Material name that shows the optical property 4. The solar system. However, you can certainly use them to get an idea as to how to respond when faced with similar questions during the interview. Describe … How is PN Junction diode used? if no then why? A. Semiconductor Material name that shows the optical property? Thanks October 14, 2014 at 7:03 AM Post a Comment. 6 μA c. 9 μA d. 12 μA. 2. Incandescent to LED, fluorescent to LED, Metal Halide to LED.  Thermal energy and electrical energy When an electron jumps in the conduction band, when electron-hole recombination takes place in depletion region a photon emits, When electron travel from valence band to the conduction band, Due to the barrier potential of the depletion region, Due to the barrier height of the p- region, Due to the barrier height of the n- region, Blue color photon energy is more than the red color photon, so more energy required, Red color photon energy is more than the Blue color photon, Neither forward bias nor the reverse bias, it operates with ac current of small magnitude. Refer Answer-1 . fjs.parentNode.insertBefore(js, fjs); The name of these two are With that in mind, here are the top five teamwork interview questions and answers for your consideration: 1. 3. 2. It all depends what you are converting. 14. Question2: Why is silicon preferred over germanium in the manufacture of semiconductor devices? 3. Conduct the experiment for obtaining the forward bias VI characteristics of the given diode.if the cut in voltage is .3V,it is Germanium diode.If it is .6,diode is made of silicon. 2. Watu.post_id = 382; xfbml : true, The Viva –What to Expect •They will start with an easy ‘warm-up’ question, usually ‘tell us in brief what your thesis is about’. Questions & Answers - LED Lighting • What are LED bulbs? 300+ TOP WEB TECHNOLOGY Lab VIVA Questions and Answers Pdf.  Coulomb potential var question_ids=''; They will reduce your energy consumption by at least 50%, and as much as 80%, depending on the light you choose and the light we are replacing. Microprocessor is a CPU fabricated on a single chip, program-controlled device, which fetches the instructions from memory, decodes and executes the instructions. Answer: It was a war started by Germany during the Second World War, which resulted in the mass murder of selected groups of innocent civilians of Europe. What is the green color wavelength range? If you want to see how you can grab teamwork interview questions by the horn, nothing helps quite like some examples. What is a zener diode? 1. It is a substance with conduction properties between metals and insulators. planck constant experiment When an electron jumps in the conduction band version : 'v3.1' Which material do we use an LED? 3. A pure semiconductor completely free from impurities is called intrinsic semiconductor. For now, you can expect at least a savings of 50% when you convert fluorescent lights to LED and 70% or more when you convert Metal Halide or High Pressure Sodium to LED. BJT current controlled current device, Fet voltage controlled current device, in BJT current produced by holes and electrons, but in FET current produced due to any one only, 2.What is meant by a unipolar device?  Its made by Zirconium Home/Labs/Viva Questions/FET FET 1.What are the comparisons and differences between a BJT and a JFET? Light Emitting Diode or LED objective questions and answers. Online Teaching: A Master Class Course for Teachers, Solid State Physics for Graduate Students, [determination of Planck’s constant by using light-emitting diodes (LEDs)], READ ALSO: Semiconductor Diode Laser Viva. Watu.hAppID = "0.10829200 1609528654"; The maximum energy that an electron in a metal has at the absolute zero temperature is called the Fermi level of energy. 6.62607004 × 10-34 m2 kg / s 2015First Grade College Challaker -577522 6-16 3. Now, splitting of energy level takes place.  When electron travel from valence band to the conduction band 1. From your observation, you can also analyze the stoping potential of all the LEDs. }); All rights reserved.  Due to the barrier height of the n- region  E. Schrodinger 13. Which device converts electrical energy to light energy? So when your LED bulb eventually stops to work, you don’t have to worry about costly or special disposal procedures. planck’s constant experiment procedure 5. Multiple Choice Questions and Answers on Optical Fiber Communication(Part-1).Objective Questions and Answers on Optical Fiber Communication . Possible Answer #1: “I rate my leadership skills an 8 out of 10. That has two types of semiconductors (n- and p-type) and a p-n junction. planck’s constant experiment pdf Questions PART 1. List of Most Popular CSS Interview Questions with Answers: The CSS questions covering almost all the basic and advanced CSS categories are explained with examples.. CSS is one of the most essential features of Web development. So here are some very very important questions on electromagnetic induction and its applications with answers … Practice your answers to common interview questions 3. ... Answer: The clergy and the nobles led a life of luxury and enjoyed numerous privileges. In this list of Networking interview questions, we have covered all commonly asked basic and advanced interview questions on networking with detailed answers to help you clear the job interview. And this answer will change over time as LED Lights become more efficient and their lumens/watt get better. LEDs are comprised of 3 main components: the LED’s (the chip set that produces light), the driver (converts AC to DC) and the heat sink (to keep everything cool). But at a certain value of the potential, it appears. Here, in LED, If an electron of sufficient electrical energy (eV) is passed across a material then a photon emits. Home/Labs/Viva Questions/FET FET 1.What are the comparisons and differences between a BJT and a JFET? What device converts light energy to electrical energy? 5.  electron-hole recombination; in depletion region But this sort of question also applies for each chapter in your thesis. Join the Courses https://apniphysics.com/courses/. Chapter-wise Short Questions & Answers in Basic Electronics You will find lots of questions and answers in each chapter.  GaAs  Optical pumping and radiation Questions (28) Publications (3,970) Questions related to SMPS. The slope of the curve will give a measured value of Planck’s constant. Mailbox. Question4: Explain what are the two mechanisms of breakdown in a p-n junction? Prepare smart questions for your interviews 9. All our LED lights and bulbs are energy saving that are designed to replace incandescent, fluorescent, CFL, metal halide, high pressure sodium and halogen lights in your office, facility or business. Take the current measurement of each LED by varying the voltage as given in the table. These topics are chosen from a collection of most authoritative and best reference books on Computer Networks.  Due to the barrier height of the p- region What is the difference between EMF and Voltage ? What are Cascading Style Sheets? Draw the internal circuit diagram of an LED. Series and parallel LCR Circuits (Determination of resonant frequency and quality factor) 3. The frequency of applied AC at which resonance takes place or current is maximum. Mainly energy band diagram of p-n junction diode and how electron transit from n to p side in depletion region in case of forward biasing. In LED how photon emits?  458–580 nm Ans. Semiconductor Electronics Important Questions for CBSE Class 12 Physics Semiconductor, Diode and its Application.  Red color photon energy is more than the Blue color photon There is much to learn, but I have always been a strong leader. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, … Ans. Depletion region Concept/Idea along with potential barrier for Si/Ge. Near to the p-n junction, there is a specific region known as the depletion region. Q.3. Discuss how fievenfl and fioddfl memory banks are accessed using control signals. VIVA VOCE QUESTIONS - SEMICONDUCTORS Q.1.What is a semiconductor ? What symbol do we use for the Light Emitting Diode? Electrical Circuits Lab Viva Questions and Answers Electrical Lab Edit Question No. Why should I now install LED bulbs?  Max Planck What are the parts of Galvanometer? Answer questions using the STAR method 5. }); 2. I–V Characteristics of Zener Diode. How Planck’s constant is determined?”Planck’s constant is determined by using the light-emitting diode. Called (CSS) is a list of statements (or rules) that can assign various rendering properties to HTML elements. What is the value of Z in LCR series circuit at resonance? What is the resonance frequency? Because of this reason you use; eV  =   h ν                                        h  = eV / ν This equation we will use to determine Planck’s constant. These questions are very useful as college viva questions also. Question 1. LED converts electrical signal to light form and photo diode does the reverse. • I have just replaced my existing bulbs with energy saving bulbs.

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