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Tuesday, 25 September 2012

Applied Optics-For MSc/B.E/B.Tech/M.Tech


1(a) What is luminescence? Differentiate between fluorescence and phosphorescence. (10 Marks)
(b) Explain three processes that take place during interaction of radiation with matter. (10 Marks)
2(a) What is population inversion? (4 Marks)
(b) Derive the relations between various Einstein co-efficients. (6 Marks)
(c) What are the basic requirements for an active medium in a laser system? (6 Marks)
(d) Determine the ratio of spontaneous to stimulated emission and A21/B21 if wavelength is 1390 nm and temperature 300K.     (4 Marks)
3(a) Explain in detail any 4 pumping mechanisms. (8Marks)
(b) What are the configurations possible for cavity resonators in a laser system? (6 Marks)
(c) Determine the  number of modes of standing waves in the resonant cavity of length 1m of  He-Ne laser operating  at wavelength 6328 Å.(6 Marks)
4(a) Explain with examples three-level and four-level laser systems. Mention advantages and disadvantages. (6 Marks)
(b) What is coherence? (6 marks)
(c) What is mode coupling? (4 Marks)
(d) What is a metastable state? (4 Marks)
5(a) With neat figures, explain the working of Ruby laser. (10 Marks)
(b) Explain the working of Nd:YAG laser. (10 Marks)
6(a) With the help of energy level diagram, explain the working of He-Ne gas laser. (10 Marks)
(b) Explain the working of C02 laser. (6 Marks)
(c) Calculate on the basis of Einstein’s theory the number of photons emitted per second by He-Ne laser source emitting light of wavelength 6328Å with an optical power 10 mW. (04 Marks)
7(a) Explain how lasers are used in cutting, drilling and welding operations in industry. (6 Marks)
(b) Write a short not on sensors developed by using lasers. (6 Marks)
(c) What is LIDAR? Explain. (4 Marks)
(d) What is the role of laser in ophthalmology? (4 Marks)
8 (a) Explain the construction of hologram using laser. Mention some applications of holography. (8 Marks)
(b) With a neat block diagram, explain fiber optic communication. (8 Marks)
(c) A fiber 500m long has an input power of 8.6 mw and output power 7.5 mw. What is the loss specification in cable? (4 Marks)

Friday, 21 September 2012

Automotive electronics-model question paper for Diploma/B.E/B.Tech


1(a) Write a note on high-voltage circuit and distribution in an engine. (6 Marks)
(b) Explain the working of proportional integral controller. (6 Marks)
(c) Briefly explain any 4 major categories of automotive electronic systems. (8 Marks)
2(a) Explain in detail the working and applications of operational amplifiers. (8 Marks)
(b) Differentiate between R-S flip-flop and J-K flip-flop. (8 Marks)
(c) Find the binary sum of 0110 and 0010. Subtract 0101 from 1110. (4 Marks)
3(a) Write a note on condition code register of microcomputer. (4 Marks)
(b) Explain in detail the role of digital to analog converter in a microcomputer. (6 Marks)
(c) What is brake-specific fuel consumption?(4 Marks)
(d) Explain the concept of engine mapping. (6 marks)
4(a) Write a note on engine crankshaft angular position sensor. (6 Marks)
(b) What is a thermistor? Explain its role in automotive electronics system. (6 Marks)
(c) Explain the working of exhaust gas recirculation actuator. (4 Marks)
(d) What is variable valve timing? (4 Marks)
5 (a) Write a note on control modes for fuel control. (6 Marks)
(b) What is acceleration enrichment? (4 Marks)
(c) Explain the term closed-loop ignition timing. (6 Marks)
(d) What do you mean by hybrid vehicle powertrain control? (4 Marks)
6(a) Using a neat figure, explain the working of vacuum operated throttle actuator. (8 Marks)
(b) Write a note on antilock braking system. (6 Marks)
(c)Explain the working of VFD display used in automotive instrumentation. (6 Marks)
7(a) Write a detailed note on on-board diagnostics of automotive systems. (8 Marks)
(b)Write a note on computerized automotive maintenance system. (8 Marks)
(c) What is occupant protection? Explain. (4 Marks)
8(a)Write notes on the following:
(i) Electric and hybrid vehicles   (ii) Fuel cell powered cars   (iii) Speech synthesis
(iv) Telematics   (v) Stability augmentation   (20 Marks)