Code No: 220253 II B.Tech II Semester Supplementary Examinations on April-2005
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ELECTRONIC DEVICES (Electrical and Electronics Engineering) Time: 3 hours
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Answer any FIVE Questions All questions carry equal marks --What is Hall effect and explain its applications? Explain what do you understand by drift and diffusion currents in semi conductors? Derive an expression for electron current due to drift and diffusion? A PN junction diode has a reverse saturation current of 5/A at 25oC. Determine its static and dynamic resistance for a forward bias of 0.2V at 75oC. Distinguish between zener and avalanche breakdown Mechanisms in reverse biased PN junctions. Explain how the zener diode acts as a voltage regulator? Explain the VI characteristics of a photo diode?
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Max. Marks: 70
Different Transition and Diffusion capacitance in a diode. Explain the concept of Tunnel diode in detail. Draw and explain its VI characteristics in detail?
4.a) b)
Explain the output characteristics of a Transistor in CE configuration? Compare CB, CE, CC amplifier configurations with respect to voltage gain, current gain, input resistance and output resistance. Which configuration is most widely used for Audio frequency amplification and why? What is early effect? Explain it briefly.
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Explain the operation of a MOSFET in enhancement mode and depletion mode with the help of their gate and drain characteristics? What is pinch off voltage and what is its significance? Find the pinch off voltage for a P channel JFET with a=210-4 cm and channel resistively =10ohm-cm. 2 Prove that the ‘gm’ of FET is given by g m I DSS .I DS . VP Explain motion of charged particles in both electric and magnetic fields? Define Deflection sensitivity in CRO? Derive the expression for it? Compare the electric and magnetic deflection systems.
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Explain the need for Biasing a Transistor? What is the position of Q point for minimum distortion? Explain how the position of Q point changes with temperature and . Define the stability factors S,S,S and explain why S is more important. What is the condition to avoid thermal runway?
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7.a)
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Code No: 220253
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Write short notes on any 3 of the following? a) Schottky diode b) Biasing of FETS c) Fitters d) Liquid crystal display.
Code No: 220253 II B.Tech II Semester Supplementary Examinations ...
b) Explain the concept of Tunnel diode in detail. Draw and explain its ... voltage for a P channel JFET with a=2Ã10-4 cm and channel resistively · Ï=10ohm-cm.
starter, (iii) Auto transformer starter limiting the supply line starting current to · twice the full-load value. Find the auto-transformer tapping in this case. - - -.
a) Follower moves outwards through 40mm during 60° of cam rotation. ... Draw the profile of the cam when the axis of the follower is offset 20mm towards.
SIMULA. b) What is concurrency ? Briefly explain the concurrency features in ADA. 8. Briefly explain the following : · (a) · Basics of LISP · (b) · Type equivalence.
c) A simple Delavel steam turbine nozzle ring is supplied with 200 kg/hr of dry · steam at 10 ... iii) The dryness of steam just as it leaves the turbine rotor blading.
b) Explain the principle of working of Photo-diode. Draw its volt-ampere · characteristics. Give its important applications. 4.a) Compare the performance of transistor in CB,CE and CC configurations. b) Draw the input and output characteristics of p-
Code No: 220155. II-B.Tech. II-Semester Supplementary Examinations, April/May-2004 · PROBABILITY AND STATISTICS · (Common to Civil Engineering, Mechanical Engineering, Production ... b) If X is normally distributed with mean 8 and S.D 4, find ... 3.a
State the second law of thermodynamics and explain how it is applied for · development of heat engine. 6. A reversible heat engine absorbs 252 kcal at 260°C, ...
b) Describe MOTT & WHEELER method of test Coke. 2.a) Describe a method for the manufacture of producer gas. b) Mention important properties and uses of ...
1.a) Explain the star-delta transformation. b) Using mesh analysis, find the currents in all the branches of the network given · below. 2.a) Explain Lenz's law and ...
Derive the equation for steady-state heat transfer through a spherical shell of inner · radius r1 and ... C and the outer wall of the annulus is insulated. Neglecting ...
1.a) Explain with a neat sectional view the operation and advantages of hot blast · cupola. b) Discuss the various types of refractories used for cupola lining.
5.a) What is sine bar. Sketch an arrangement for any one of the applications. b) Describe the constructional features and working of optical collimator.
Polynomials in single variable are stored in the form of linked lists. Each · structure has space for one coefficient and one exponent and a link. Assume.
armature and field resistances are 0.03 ohm. And 60 ohm ... 6.a) Explain with the help of diagrams how a rotating magnetic field is produced in · the air gap of a ...
b) With the help of a neat sketch of psychometric chart show the various psychrometric · processes naming them clearly. c) Explain what effective temperature is ...
b) State the method of manufacturing and special qualities of the following bricks. (i) sand â lime bricks (ii) Fly ash bricks (iii) Stabilised bricks. c) Explain briefly ...
(a) Job order production and batch production system. (b) Mass production and flow production. [4+4+4+4] · 7. DefineâCritical pathâ, âslack timeâand âDummy ...
Write a short note on 'compressor surge and its prevention'. 6.a) In rocket propulsion, explain the following: · (i) Thrust coefficient (ii) Characteristic velocity (iii) Specific impulse. b) Derive the 'Generalised Thrust Equation, of a rocket from
with 64 addressing modes. The computer has 500 instructions. In one of the · instruction format the First Field represents operator field, Second Field is Mode,.
1. a) With a schematic diagram explain the operation of a hot blast cupola. What is its · application? b) How are the refractories classified? Explain the factors in ...
