Explain the working of PN junction diode under (i) Forward bias and (ii) reverse bias conditions. Draw the volt-ampere characteristics of the diode in the above two cases and account for the shape of the curve.
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Code No:220253 II.B.Tech II-Semester. Supplementary Examinations. January,2003 ELECTRONIC DEVICES (Electrical and Electronics Engineering) Time: 3 hours. Max.Marks:70 Answer any FIVE questions All questions carry equal marks. --1.a) Explain the terms (i) Carrier mobility and (ii) Conductivity. b) Distinguish between drift and diffusion currents. c) Discuss the phenomenon of “Hall Effect”. Give one important application of Hall Effect.
Draw the structure of schottkey diode and explain the working of it. Draw the circuit symbol of schottkey diode. Explain the principle of working of Photo-diode. Draw its volt-ampere characteristics. Give its important applications. Compare the performance of transistor in CB,CE and CC configurations. Draw the input and output characteristics of p-n-p transistor in CE configuration and explain the working of it.
5.a)
Draw the structure of FET. Explain, how the depletion layer in an FET is formed and how does it have an effective control over the channel current. What are the advantages of FET over a bipolar transistor?
b) 6.a)
Discuss the motion of an electron in a uniform magnetic field with an initial velocity (i) Zero into the field (ii) o parallel to the field (iii) o perpendicular to the field (iv) o at an angle to the field. An electron enters a magnetic field of 10 m Wb/sq.m with a velocity of 5x107 m/sec at 300 to the direction of the field. Determine (i) The time required to execute one spiral of the helical path. and (ii) The radius of the helix.
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Define (i) ripple factor and (ii) regulation with reference to rectifier circuits. Draw the circuit of Bridge rectifier and explain the working of it. Compare the advantages and disadvantages of bridge rectifier and full-wave rectifier. Write short notes on any THREE of the following: (a) Intrinsic and Extrinsic type semiconductors (b) Tunnel diode (c) Varactor diode (d) UJT (e) Cathode ray tube. *********
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-n-p transistor in CE configuration · and explain the working of it. 5.a) Draw the ...
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. - - -.
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.
W/mk] followed by a 25mm layer of fiber-glass insulation [k=0.048 W/mk]. ... boundary layer thickness in the heat transfer over a flat plate tested over its entire ...
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 ...
Explain in detail gas liquid contact in mechanically agitated vessels. ... b) Derive the expression for height of a water cooling tower by using HTU and NTU.
Explain determinants and use of determinancy diagram. 2.a) ... Draw the E/R model representation of many-to-many relationship and · superfluous entity tables.
5.a) Describe roll pressure distribution along arc of contact and derive an ... b) Explain the effect of friction and strip tensions on rolling load and process.
b) Give the steps of a registry-based algorithm for finding and using idle · workstations. 4.a) With reference to distributed file system implementation explain i) ...
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 ...
The maximum tensile or compressive stress is not to exceed 56 MPa. 2. (a) Discuss the effect of keyways on shafts . (b) A 15kW , 960 rpm motor has a mild steel ...
Code No: NR320802. NR ... 1. (a) Define reaction rate constant. Develop an expression that facilitates calcula- · tion of units of rate constant for any order.
c) Determine the symmetrical components of currents in the following circuit · (contdâ¦3) · AjntuWorld. ... a) Synchronous phase modifiery · b) Insulating materials.
b) Compare between computer system and PLC. 2. a) Define ... 7. a) Explain the concept of a computer network and discuss the requirement of · networks used ...
2.a) How do design and material selection help to control metallic corrosion. b) Write briefly on chemical conversion coatings. 3.a) What are thermosetting resins? How they are fabricated? b) What are silicone resins? How they are made? Mention their
the following (with comments and indentation) · a) To read the ... OR. Develop a complete COBOL program with indentation and comments to do the · following:.
... shown below. Take node 4 as reference · node. 7.a) Obtain the relation between Y and Z parameters. b) Find A B C D parameters of the network shown below.
