II-B.Tech. I-Semester Examination Nov/Dec 2002 ELECTRONIC DEVICES (Electronics and Communication Engineering and Electronics and Telematics Engineering) Time:3 hours Max.Marks:70 Answer any FIVE questions All questions carry equal Marks --1.a) Draw the energy band structure in conductors, semiconductors and insulators at a constant temperature. b) Describe Hall effect in semiconductors. Derive an expression for the Hall voltage. What are the parameters that can be measured by this effect.
Derive an expression for electrostatic deflection sensitivity in a cathode ray tube. The distance between the plates of a plane parallel capacitor is 1 cm. An electron starts at rest at the negative plate. If a direct voltage of 1,000V is applied, how long will it take the electron to reach the positive plate?
3.a) b)
Explain the principle and operation of photodiodes. What is the minimum energy, expressed in joules and in electron volts, required to remove an electron from the surface of metallic potassium, the photoelectric threshold wavelength of which is 5,500Ao?
4.a) b)
Derive an expression for transition capacitance of a diode. What are the different breakdown mechanisms. Explain?
5.a)
Derive the expression hFE hfe = -------------------1-( ICBO+ IB) hFE
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2.a) b)
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Explain the current components of p-n-p transistor.
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Explain MOSFET construction. How it can be biased. Explain the operation of PIN diode and how it can be used as switch. Determine the density of donor atoms which has to be added to an instrinsic Ge semiconductor to produce n-type semiconductor of conductivity 5mho/cm. Given that μn = 3850 cm2/v-s. Write short note on: a) Schottky diode (b) Diffusion mechanism (c) UJT and its characteristics. *** *** ***
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7.a) b)
What is FET small-signal model. Derive the expression gm = gmo 1- VGS .
b) What is the minimum energy, expressed in joules and in electron volts, required · to remove an electron from the surface of metallic potassium, the ...
1.a) With a neat diagram, explain the functionality of layers, protocols and interfaces. b) What is the ... Explain the following with reference to Transport layer:.
How do you manufacture calcium Ammonium nitrate? Explain. 6. Discuss once through process and partial recycle process of urea manufacture. 7. Describe the ...
4.a) What is a routing table? b) List the four major routing classifications and state the characteristics of each? 5.a) Describe UDP with its header format.
b) What is an harmonicity? How it explains the thermal expansion of solids? ... Discuss briefly the Debbyes's theory of lattice specific heat · 4.a) Derive an ...
a) Two phase Locking protocol · b) Check ... 6.a) Explain Two phase locking with algorithms. b) What is ... b) What are the fields in update log record. Explain the ...
b) Calculate the available continuous power of a hydro-electric station from the ... b) With a neat diagram, explain the working of a nuclear power plant. 5 a) What ...
b) Explain hall effect and how it can be applied to measure the charge density 'e' · and mobility 'μ' of change carrier · c) Derive an expression for the electro-magnetic defection sensitivity of a C.R.T. · 3 a) Explain the working of a PNP transist
C/C distance between the gantry girders = 14m · Width of wheel base = 3m · Clear edge distance for the hook of the crane = 1m · Crane (EOT) capacity = 160KN.
Code No.411405. -3-. Set No.1. 6.a) State Robert's theorem and explain its application. b) Obtain the cograte mechanism for a drag link mechanism (A drag link mechanism · has two cranks) · 7. What is Function generation? Explain in detail with ... th
b) A governor of the Proell type has each arm 250mm long. The pivots of the ... One wheel is situated at the centre of the shaft and the other at a distance .... energy to be stored in represented on the diagram by an area of 50 Sq. Determine.
Set No:1. 4.a) Define the term 'Maintainability' and establish its importance in reliability ... 5.a) Outline the maintainability program elements with an example of ...
glass borelate the above scale with celsius temperature scale. How is the asolute · temperature expressed in · o · V? 2.a) State the first law of thermodynamics ...
6.a) A cylindrical air receiver for a compressor is 1.5m in internal diameter and made · of plates 15mm thick. If the hoop stress is not to exceed 100 N/mm.
The state variable model of the plant is given by · X = AX + bU · Y = CX · With A = · 0 1 ; b = · 0 · c = · [1 · 0] · 0 â1 · 1 · obtain the discrete time state description for ...
a) Laser welding ... What are the main applications of Laser welding. b) Explain various ... welding: · i) Tungsten (ii) Copper (iii) Aluminium and (iv) Mild steel.
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