Time: 3 hours Max. Marks: 70 Answer any FIVE questions All questions carry equal marks

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1 Code: 9A02401 PRINCIPLES OF ELECTRICAL ENGINEERING (Common to EIE, E.Con.E, ECE & ECC) Time: 3 hours Max. Marks: 70 1 In a series RLC circuit, R = 5 Ω, L = 1 H and C = 1 F. A dc v ltage f 20 V is applied at t = 0. Obtain i (t). 2 (a) Define and obtain transmission parameters by taking any ne example. (b) Obtain short circuit parameters for the given network shown below. 1 Ω 2 Ω 3 Ω Ω 6 Ω 3 (a) Write short notes on constant K- low pass filters. (b) Design a constant K-low pass filter to match with a line having characteristic impedance of 500 Ω and to pass frequency up to 5 khz. 4 What is an attenuator? Explain π-type attenuator and bridged T-type attenuator by deriving necessary equations. 5 Explain the magnetization and load characteristics of DC generators. 6 Discuss with suitable circuit diagram Swinburne s test to find out the efficiency of a dc machine. 7 A single phase transformer working at 0.8 power factor leading has an efficiency of 80% at both half load, at full load of 600 W. Determine the efficiency at 75% of full oad. 8 Discuss briefly: (a) Shaded pole motor. (b) Capacitor motor.

2 Code: 9A04401 SWITCHING THEORY & LOGIC DESIGN (Common to EEE, EIE, E.Con.E, ECE & ECC) Time: 3 hours Max. Marks: 70 1 (a) Explain the 7 bit Hamming code. (b) A receiver with even parity hamming code is received the data as Determine the correct code. 2 (a) Obtain the truth table of the following Boolean functi n and express the function as sum of minterms and product of maxterms F = (A+B) (B+C). (b) Simplify the following Boolean functions to minimum number of literals. (i) xyz + x y + xyz. (ii) xz + x yz. (c) Mention properties of XOR gate. 3 (a) Simplify the following Boolean function for minimal SOP form using K-map F(A,B,C,D) = (0,1,2,4,5,6,8,9,12,13,14) (b) Simplify the following Boolean function for minimal POS form using K-map F(X,Y,Z) = X YZ + XY Z + XYZ + XYZ 4 (a) What is multiplexer? Construct 4*1 multiplexer with logic gates and truth table. (b) Design 4*16 decoder using two 3*8 decoders with block diagram. 5 Using PLA logic, implement a BCD to excess 3 code converter. Draw its truth table and logic diagram. 6 Design a sequential circuit with two D-Flip-Flops A and B and one input x. When x=0, the state of the circuit remains the same. When x=1, the circuit goes through the state transitions from 00 to 01 to 11 to 10 back to 00 and repeats. 7 (a) Exp ain Mealy model with logic diagram. (b) Explain Moore model with logic diagram. 8 (a) Explain the salient features of the ASM chart. (b) Draw an ASM chart and state diagram for the synchronous circuit having the following description: The circuit has a control input x, clock and outputs A and B. If x=1, on every clock edge (rising or falling) the code on BA changes from and repeats. If x=0, the circuit holds the present state.

3 Code: 9A04402 ELECTRONIC CIRCUIT ANALYSIS (Common to EIE, E.Con.E & ECE) Time: 3 hours Max. Marks: (a) Compare CB and CC amplifiers. (b) A common emitter amplifier is driven by a voltage source f s u ce esistance R S = 800 and the load impedance is R L = 1 k The h parameter values are h fe = 50, h ie = 1.1 k h oe = 1/40 k mhos, h re = 2.5x10-4. Compute the A I, R i, A v, R using exact and approximate analysis. 2. (a) Explain about the effect of biasing resistors on Darlington pair and how this problem is solved. (b) Derive the current gain and input impedance of a Darlington pair. 3. (a) Obtain an expression for CE short circuit current gain. (b) A BJT has h ie = 6 k and h fe = 224 at I c = 1 ma with f T = 80 MHz and = 12pF. Determine (a) g m (b) (c) and (d) at room temperature and a collector current of 1 ma. Determine the parameters g m,, and of the small signal high frequency model of the BJT. 4. (a) What is the concept of MOSFET amplifier? Explain. (b) Draw the circuit diagram of common source amplifier with resistive load? Explain its operation. 5. (a) What are characteristics of open loop amplifiers? Explain. (b) An amplifier requires an input signal of 60 mv to produce a certain output. With a negative feedback to get the same output, the required input signal is 0.5V. The voltage gain with feedback is 90. Find the loop gain and feedback factor. 6. (a) What is the function of oscillator? Explain. (b) Draw the circuit diagram of RC phase shift BJT oscillator? Explain its operation? Show that the frequency of oscillator is f = 7. (a) What are the different types of class power amplifiers and calculate the efficiency of direct coupled class A power amplifier. (b) A class A power amplifier has a transformer as the load. If the transformer has a turn ratio of 5 and the secondary load is 100 ohms, determine the maximum ac power output. Given that zero signal collector current is 100 ma. 8. Obtain the bandwidth of a signal tuned transistor amplifier.

4 Downloaded From Code: 9A04404 PULSE AND DIGITAL CIRCUITS (Common to EIE, E.Con.E, ECE, ECC & MCT) Time: 3 hours Max. Ma ks: 70 1 Write short note on the following: (a) Attenuators. (b) RC Double differentiator. (c) RLC ringing circuit. 2 (a) Explain transfer characteristics of the emitter coupled clipper and derive the necessary equations. (b) Discuss the applications of voltage comparator. 3 (a) Explain the switching characteristics of transistor. (b) Explain the phenomenon of latching in a transistor. 4 (a) Draw the circuit diagram of self bias with symmetrical triggering using diodes explains the working. (b) Discuss the various methods of triggering a multivibrator. 5 (a) Explain about transistor television sweep circuit. (b) List applications of voltage and current sweep generators. 6 (a) Why sampling gates are called selection circuits? (b) What are the advantages of unidirectional sampling gates? 7 What are symmetrical and asymmetrical binary circuits? Explain. 8 (a) What are the basic operating principles of both synchronization and frequency division? (b) Clearly explain the difference between phase delay and phase jitter with proper analysis.

5 Downloaded From Code: 9A04406 ELECTROMAGNETIC THEORY & TRANSMISSION LINES (Electronics & Communication Engineering) Time: 3 hours Max. Marks: 70 1 (a) Find the electric due to uniformly charged sphere of charge density. (b) Find the flux density at a point (5, /6, 0) in cylindrical co- rdinates if p tential is. 2 Derive Poisson s and Laplace s equations. Explain their applications 3 (a) Obtain the expression for inductance of a torroid of circular section with n closely spaced turns. (b) A steady current of 1,000 A is established in a long hollow aluminum conductor of inner radius 1 cm and outer radius 2 cm. Calculate B as a function of radius. 4 (a) Express the Maxwell s equations in differential and integral forms for sinusoidal time-varying fields. (b) In free space find H. 5 Explain wave propagation in a conducting medium. 6 In free space (z 0), a plane wave with H i = 10 cos (10 8 t-βz) a x ma/v is incident normally on a loss less medium (μ = 8 μ 0 and ε = 2 ε 0 ) in region z 0. Determine the reflected wave H r, E r and the transmitted wave H t, E t. 7 Obtain the solutions of transmission line equations. Derive the expressions for propagation constant, attenuation constant, phase constant, the characteristic impedance and phase velocity. 8 A series RC combination, having an impedance Z L = (450-j600) Ω at 10 MHz, is connected to a 300 Ω line. Calculate the position and length of a short circuited stub designed to match this load to the line.

6 Downloaded From Code: 9AHS401 MANAGERIAL ECONOMICS & FINANCIAL ANALYSIS (Common to EIE, E.Con.E & ECE) Time: 3 hours Max. Ma ks: 70 1 Discuss the nature and scope of managerial economics? 2 What elasticity of demand is important? Explain the fact rs g verning elasticity of demand. 3 How BEP can be used for taking add or drop decisions? Illustrate. 4 (a) Define market and explain how markets are classified? (b) What are the important features in any market structure? 5 Discuss the company features of form of business organization. 6 (a) Explain the factors affecting the requirements of working capital. (b) Determine the capital, and its features. 7 Briefly explain the following: (a) Tangible assets. (b) Fixed assets. (c) Intangible assets. (d) Inventory. 8 How are ratios s classified for the purpose of financial analysis? With assumed data, illustrate any two types of ratios under each category?

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Downloaded From All JNTU World Code: 9A02401 PRINCIPLES OF ELECTRICAL ENGINEERING (Common to ECE, EIE, E.Con.E & ECC) 1 Find initial conditions for voltage across capacitor, the currents i 1, i 2 and the derivatives for the circuit