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JNTU KAKINADA 2-1 ECE 2009 (ECA) EXTERNAL PAPERQUESTIONS

1ST CHAPTER

1)With the help of necessary equations, discuss the variations of Av, AI, Ri,Ro, Ap with RS and RL in common Emitter configuration.

2) Perform the Small Signal Analysis of CG Amplifier and explain thecharacteristics with the help of relevant graphs.

3) Perform the Small Signal Analysis of CD Amplifier and explain thecharacteristics with the help of relevant graphs.

2ND CHAPTER

1)Draw the circuit for Darlington Pair Amplifier and derive theexpressionsfor AI ,Av, Ri and Ro.

Draw the circuit diagram of Cascode-Transistor Amplifier Circuit andanalyse its performance.

3RD CHAPTER

1)Explain about Hybrid-? How do Hybrid-? varywith temperature?

4TH CHAPTER

1)Derive the expression for Maximum value of Conversion Efficiency ofClass A Power amplifier

2)Draw the circuit diagram of class-B Push pull amplifier and explain theoperation.

5TH CHAPTER

1) Draw the circuit diagram of a Double-tuned amplifier and explaindifferentstages of simplification of its equivalent circuit.

2) Draw the circuit for single tuned capacitive coupled amplifier and explainitsworking. Derive the expression for (A/Areso)

6TH CHAPTER

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1) Explain the principle and working of class-C tuned power amplifier.Derive the expression for itsefficiency.

(2) Write notes on wide band tuned amplifiers.

3)Draw the circuit for JFET tuned R.F. amplifier and explain its working.

4)What is stagger tuning? How it is different from synchronous tuning?Derivean expression for the selectivity of a stagger tuned amplifier.

7TH CHAPTER

1)Draw the circuit and explain how short circuit over load protection isprovided in Voltage Regulators circuits.

2) Define different performance parameters of a voltage regulator andexplain their importance.

3) Define the terms(i) Load Regulation(ii) Line Regulation(iii) RippleRejection

4) Draw the circuit for series type Voltage Regulator and explain itsworking.

8TH CHAPTER

1)With neat circuit diagram explain the working principle of IC 723 VoltageRegulator.

2) Draw the circuit for 7805 Voltage Regulator IC and explain its working.

NOTE: THESE QUESTION MAY COME /NOT COME,BUT READ & READANY 4 CHAPTERS FULL.

ALL THE BEST FOR YOUR EXAMS. (4 SETS). DO THE PROBLEMSRELATED TO THE ABOVE QUESTIONS.

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JNTU KAKINADA 2-1 ECE 2009 (ES) EXTERNAL PAPER QUESTIONS

1ST CHAPTER

1. (a) Write three reasons for studying the state of environment.(b) Write definition of “environmental studies”.(c) Discuss the recreational value of nature?

2. (a) What i s the need of mul t idi scipl inary knowledge for Tackl ing environmental problems?(b) What are the var ious reasons for defores tat ion? Also di scus s theremedial act ions?

3. (a) What i s need of awarenes s to every per son about envi ronmentalproblems?(b) What are the var ious reasons for overexploi tat ion of fores t?

4. What are the different activities that can be taken up to increase publicawareness ofenvironmental issues? Explain how they help in better environmentalmanagement.

5. Discuss the aesthetic value of nature with respect to the followingstatements.(a) A true wilderness experience is an incredible learning experience.(b) The beauty of nature encompasses every aspect of the living and non-livingpart of our earth.

2ND CHAPTER

1. (a) Describe ways of conserving metals and other mineral resources.(b) What are the environmental hazards associated with mineral extraction.

2. (a) What are the advantages of recycling minerals?(b) How can you as an individual conserve different natural resources?

3. (a) What is soil erosion? How can it be checked?(b) Give some examples of strategic minerals. Where are the largestsupplies ofthese mineralslocated?

4. (a) What are the changes caused due to agr i cul ture and overgrazing?(b) Explain the global inequal i t ies in the use of resources .(c) Supply of subs idized cooking gas to rural and t r ibal areas reducesdefores tat ion. Comment

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5. (a) What are the envi ronmental ef fect s of mineral ext ract ion?(b) What do you mean by equi table use of resources in a Global contest?

3RD CHAPTER

1. (a) Define ecosystem and list components of an ecosystem.(b) Briefly explain the manner in which ecosystems are destroyed byhuman ac-tivites.

2. (a) Explain the significance of presening balance in various kinds ofecosystems.Illustrate with examples.(b) Describe the structure and functions of an ecosystem.

3. (a) What are food chains? How they are impor tant?(b) Explain the s t ructure of St ream ecosys tem.

4. (a) What i s the var ious values of biodiver s i ty?(b) What i s the main s t ructure and funct ion of gras s land ecosystems?

4TH CHAPTER

1. What do you understand by the term biodiversity? Write briefly about thedifferentkinds of diversity in organisms.

2. (a) Why is it necessary to maintain biodiversity?(b) What are the different services that are contributed in various ways bybiodi-versity?

3. (a) Write a brief note on biodiversity and ecosystem diversity.(b) Explain the evolution of diverse species in an ecosystem.

4. (a) What i s the cont r ibut ion of India for global biodiver s i ty?(b) What are the var ious In- s i tu conservat ion methods of biodiversity?

5TH CHAPTER

1. (a) Oceans are ultimate sink for most of the waste we produce .Explain.(b) List off shore sources of Marine Pollution.(c) Explain the effects of oil pollution on the ocean .

2. (a) Explain the major water pollutants and their effects.

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(b) Explain the significance of dissolved oxygen in rivers.

3. (a)What are the var ious causes and ef fect s of mar ine pol lut ion?(b) What i s Indoor ai r pol lut ion? What are the var ious causes of indoorai r pol lut ion?

4. What are the primary treatment techniques for sewage ? Explain.

6TH CHAPTER

1. Discuss the concept:(a) Global Warming(b) Sustainable Development(c) Environmental self Audit.

2. (a) Define watershed management and explain the objectives ofwatershed man-agement ?(b) Suggest various methods for the improvement of irrigation efficiency byreduc-ing loss due to evaporation(c) Discuss various water conservation techniques that can be practiced byindi-viduals.

3. (a) Explain the concept of sustainable development.(b) What are the major obstacles in the path of sustainable development inIndia?(c) Explain the paradoxes in the definition of sustainable development.

7TH CHAPTER

1. (a) Describe the problems created by the growing population of theearth.(b) Explain briefly the pattern of global population growth in recent yearswhichis causing alarm to environmental experts.

2. Write about some of the value systems that are endangered due toexploitation andpoor management of environmental resources .

8TH CHAPTER

1. (a) Describe how you would methodically record the elements andresources in an

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ecosystem and assess its functioning.(b) Based on your filed visits, summarize your observations and findings ofthewater resource ecosystem in your region.

2. (a) Prepare and analyze the type and amount of pollution offered by anindustryat a place near Hyderabad. Give suggestions for improvement to make thearea more environment friendly.(b) Write note on the need of a green belt/zone to be maintained by anyindustry.

3. Wr i te shor t notes on the fol lowing 4 x 4(a) HIV/AIDS (b) Rain water harves t ing (c) Envi ronmental ethics (d) Inter st ate water di sputes

4. Wr i te shor t notes on the fol lowing(a) Chi ld Wel fare (b) Urban sol id was tes (c) Di sas ter management (d)Pes t icides problem



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JNTU KAKINADA 2-1 ECE 2009 (ET) EXTERNAL PAPER QUESTIONS

1ST CHAPTER

1)Explain the construction features of a DC machine with the help of a neat sketch.

2)How DC generators are classified?

3)What are the different types of generators? Explain.

4) Sketch and explain the magnetization and load characteristics of a d.c.generator.

2ND CHAPTER

1. What is the significance of the back e.m.f of a DC Motor

2.Derive an expression for the torque of a DC motor.

3. Explain the various methods of speed control of a DC shunt motor

4. Deduce the condition for maximum efficiency of a DC motor.

5. Explain the internal and external characteristics of dc shunt motor.

3RD CHAPTER

1. Explain the transformer on no-load & load with phasor diagram

2. Explain and draw the equivalent circuit of a transformer.

3. Explain the principle of operation of a transformer.

4. What is an ideal transformer? Draw the no load phasor diagram of trans-former.

5)Discuss the constructional details of 1-phase transformer?

4TH CHAPTER

1. Explain how to determine efficiency, regulation and equivalent circuitparametersof single- phase transformer by conducting O.C. and S.C. tests.

2. Deduce the expression for regulation of a single-phase transformer


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3. With neat circuit diagrams, explain the procedure for conducting OC &SCtests on a given 1- f transformer to predetermine its regulation &efficiency.

4. Deduce the condition for maximum efficiency of a single phasetransformer.

5TH CHAPTER

1. Describe the phenomenon of production of torque in Induction Motor?

2. What are the different losses in a three-phase induction motor? Explain.

3. Explain the construction and working principle of a three-phaseinduction motor.

4. For predetermining the efficiency of a single phase transformer, explain withneatcircuit diagrams the tests to be conducted on it.

6TH CHAPTER

1.Explain the constructional features of alternator.

2. Define e.m.f equation of alternator.

3. Describe predetermination of regulation of an alternator from the O.Cand S.C tests.

8TH CHAPTER

1. (a).Explain the extension range of Ammeters and Voltmeters(b).Discuss the classifications of electrical instruments.

2. (a) Explain construction and working principle of moving ironinstruments.(b) Explain the significance of controlling torque and damping torquerelevant to the operation of indicating instruments.

7TH CHAPTER

1.Explain the working of a single –phase induction motor on the basis ofdouble revolving field theory.

2. Discuss the differences between capacitor start,capacitor run andpermanent split capacitor motors.


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3. a) Explain the working principle of a split phase induction motor anddraw the speedtorquecharacteristics.b) Discuss the function of an ac tachometer. Explain its construction andapplications.

4. Explain the operation of a single-phase induction motor on the basis ofdouble revolvingfield theory and draw the speed-torque characteristics



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JNTU KAKINADA 2-1 ECE 2009 (ptsp) EXTERNAL PAPER QUESTIONS.

1ST CHAPTER

1)(a) What is Bayes’theorem? Explain with proof.

2. (a) Discuss Joint and conditional probability.(b) When are two events said to be mutually exclusive? Explain with anexample.(c) Determine the probability of the card being either red or a king whenone cardis drawn from a regular deck of 52 cards.

3) . (a) Define and explain the following with an example:i. Equally likely eventsii. Exhaustive eventsiii. Mutually exclusive events(b) Give the classical definition of probability.(c) Find the probability of three half-rupee coins falling all heads up whentossedsimultaneously.

2ND CHAPTER

1. (a) Define density function. Derive an equation for binomial distributionfunction.(b) What is the distribution function of mixed random variable? Discusswhat doyou mean by density function.

2. Define Binomial distribution. Write the expressions for distributionfunctionand density function of Binomial distribution.

3) 2. (a) Sketch the probability density function and probability distributionfunctionsof:i. Exponential distributionii. Rayleigh distributioniii. Uniform distribution.(b) List the properties of Gaussian curve.(c) Mention a few applications of Binomial distribution.

4. Define cumulative probability distribution function. Discuss distributionfunc-tion specific properties.

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3RD CHAPTER

1. (a). State and prove properties moment generating function of a randomvariable X ?(b). A Gaussian random variable X having a mean value of zero andvariance one istransformed to an another random variable Y by a square lawtransformation.Find the density function of Y.

2.State and prove properties of variance of a random variable.

3. In an experiment when two dice are thrown simultaneously, findexpectedvalue of the sum of number of points on them.

4.State the Chebyshev’ inequality and prove the same for k > 0.

4TH CHAPTER

1.Define and explain conditional probability mass function. Give itsproperties?

2.Define and explain joint distribution function and joint density function oftwo random variables X and Y.

3.State and prove central limit theorem.

5TH CHAPTER

1.Write the expression for expected value of a function of random variablesandprove that the mean value of a weighted sum of random variables equalstheweighted sum of mean values.

2.(a). Describe about joint characteristics functions?(b). Show that the variance of a weighted sum of uncorrelated randomvariablesequals the weighted sum of the variances of the random variables?

3.X is a random variable with mean ¯X = 3, variance s 2X = 2.i. Determine the second moment of X about originii. Determine the mean of random variable y = where y = -6X +22.

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6TH CHAPTER

1.Define cross correlation function of two random processes X(t) and Y(t)andstate the properties of cross correlation function.

2.State the properties of auto correlation function?

3. Distinguish between stationary and non stationary random process.(b). state the condition for wide sense stationary random process.

4.(a) Aircraft arrive at an airport according to a poisson process at a rate of12 perhour. All aircrafts are handled by one air traffic controller. If the controllertakes a 2 minute coffee break, what is the probability that he will miss oneormore arriving aircrafts .(b) Telephone calls are initiated through an exchange at the average rate of75per minute and are described by a poisson process. Find the probabilitythatmore than 3 calls are initiated in any 5 second period.(c) A random process is described by X(t) = A. where A is a continuousrandomvariable uniformly distributed on (0,1) classify the process.

7TH CHAPTER

1. State and prove wiener-khinchin relation.

2.(a). Write a short note on the cross power density spectrum?(b). State and prove any three properties of cross power density spectrum?

8TH CHAPTER

1.(a) Write the quadrature representation of narrow band noise and mentionfewproperties of narrow band noise.(b) Write the characteristics of white noise.

2.(a). Derive the relation between PSDs of input and output random processof an LTI System?(b). Discuss the spectral distribution of thermal noise?(c). Define (i) Bandpass (ii) Band Limit iii. Narrow band.?

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3. (a) What are the precautions to be taken in cascading stages of anetwork fromthe point of view of noise reduction?(b) What is the need for band limiting the signal towards the direction ofincreas-ing SVR?



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JNTU KAKINADA 2-1 ECE 2009 (SS) EXTERNAL PAPER QUESTIONS

1ST CHAPTER

1.Prove that sin c(0)=1 and plot sinc functions?

2.(a) Define orthogonal signal space and bring out clearly its application inrepresenting a signal.(b) Obtain the condition under which two signals f1(t) & f2 (t) are said to beorthogonal to each other. Hence, prove that Sin n? 0t and Cos m? 0t areorthogonal to each other for all integer values of m,n.

3.(a) Define and sketch the following elementary signalsi. Unit impulse signal ii. Unit Step signal iii. Signum function(b) Explain the Analogy of vectors and signals in terms of orthogonalityandevaluation of constant.

2ND CHAPTER

1.Show that the magnitude spectrum of every periodic function issymmetrical about the vertical axis passing through the origin.

2. (a) Derive polar Fourier series from the exponential Fourier seriesrepresentationand hence prove that Dn = 2 |Cn|(b) Show that the magnitude spectrum of every periodic function isSymmetricalabout the vertical axis passing through the origin.

3.State the limitations on functions to represent by a Fourier series.

3RD CHAPTER

1.(a).State and prove time differentiation and frequency differentiationproperties of Fourier Transform(b). State and prove time integration and frequency integration propertiesof Fourier Transform

2.(a).State and prove frequency and time shifting properties of FourierTransform.(b). State and prove time convolution and time differentiation properties ofFourierTransform.

3. (a) Obtain the Fourier transform of the following functions:


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i. Impulse function d(t) ii. DC Signal iii. Unit step function.

4TH CHAPTER

1.(a).Explain how input and output signals are related to impulse responseof a LTI system.(b).Find the impulse response for the RL filter shown figure 4b.

2. What is a LTI System? Explain its properties. Derive an expression forthetransfer function of a LTI system.

3.Explain the difference between the following systems.i. Linear and Non-linear systems.ii. Causal and Non-Causal systems.iii. Time invariant and time invariant systems.

5TH CHAPTER

1.State & prove properties of auto correlation?

2.State Parseval’ theorem for energy and power signals.

3.Explain briefly detection of periodic signals in the presence of noise bycorrelation.

4.Explain briefly extraction of a signal from noise by filtering.

6TH CHAPTER

1.(a) With the help of graphical example explain sampling theorem for Bandlimitedsignals.(b) Explain briefly Band pass sampling.

2.Explain what is meant by Aliasing.

7TH CHAPTER

1. (a) State the properties of the ROC of L.T.

2. State & prove properties of laplace transform.

3. State and prove initial value theorem of L.T.

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4. Derive the relation between Laplace transform and Fourier transform ofsignal.

5. (a) When a function f(t) is said to be laplace transformable.(b) What do you mean by region of convergence?(c) List the advantages of Laplace transform.(d) If d(t) is a unit impulse function find the laplace transform of d2/dt2 [d(t)].

8TH CHAPTER

1.Derive relationship between z and Laplace Transform.

2. State & Prove the properties of the z-transform.

3. Explain the initial value theorem and final value theorem of Z transform.



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