22-Electrical & Comm.Engg

Question 1

1. Circuits-Theory :

Answer 1

1. Circuits-Theory :Circuit components; network graphs; KCL, KVL; Circuitanalysis methods : nodal analysis, mesh analysis; basicnetwork theorems and applications; transient analysis : RL,RC and RLC circuits; sinusoidal steady state analysis; resonantcircuits; coupled circuits; balanced 3-phase circuits. Two-portnetworks.ECE 1

Question 2

2. Signals and Systems :

Answer 2

2. Signals and Systems :Representation of continuous-time and discrete-timesignals and systems; LTI systems; convolution; impulseresponse; time-domain analysis of LTI systems based onconvolution and differential/difference equations. Fouriertransform , Laplace transform, Z-transform, Transfer function.Sampling and recovery of signals DFT, FFT Processing ofanalog signals through discrete-time systems.ECE 2

Question 3

3. E.M. Theory:

Answer 3

3. E.M. Theory:Maxwe1l’s equations, wave propagation in boundedmedia. Boundary conditions, ret1ection and refraction of planewaves. Transmission lines : travelling and standing waves,impedance matching, Smith chart.ECE3

Question 4

4.AnalogElectronics:

Answer 4

4.AnalogElectronics:Characteristics and equivalent circuit~ (large and smallsignal) of Diode, BJT, JFET and MOSFET. Diode circuits:Clipping, clamping, recti tier. Biasing and bias stability. FETamplitiers. Current mirror; Amplitiers: single and multi-stage,differential, operational feedback and power. Analysis ofamplitiers; frequency-responseof amplitiers. OPAMP circuits.Filters; sinusoidal oscillators: criterion for oscillation; singletransistorand OPAMP contigurations. Function generatorsand wave-shaping circuits. Linear and switching powersupplies.ECE4

Question 5

5. Digital Electronics :

Answer 5

5. Digital Electronics :Boolean algebra; minimisation of Boolean functions;logic gates; digitallC families (DTL, TTL, ECL, MOS, CMOS).Combinational circuits: arithmetic circuit

Question 6

6. Energy Conversion :

Answer 6

6. Energy Conversion :Principles of electromechanical energy conversion :Torque and emf in rotating machines. DC machines :characteristics and performance analysis; starting and speedcontrol of motors. Transformers : principles of operation andanalysis; regulation, efficiency; 3-phase transformers.3-phase induction machines and synchronous machinescharacteristics and performance analysis; speed control.ECE6

Question 7

7. Power Electronics and Electric Drives :

Answer 7

7. Power Electronics and Electric Drives :Semi-conductor power devices : diode, transistor,thyristor, triac, GTO and MOSFET-static characteristics andprinciples of operation; triggering circuits; phase controlrectitlers; bridge converters : fully-controlled and halfcontrolled;principles of thyristor choppers and inverters; DCDCconverters; Switch mode inverter; basic concept

Question 8

8. Analog Conmmnication :

Answer 8

8. Analog Conmmnication :Random variables : continuous, discrete; probability,probability functions. Statistical averages; probability models;Random signals and noise : white noise, noise equivalentbandwidth; signal transmission with noise; signal to noiseratio. Linear CW modulation : Amplitude modulation : DSB,DSB-SC and SSB . Modulators and Demodulators; Phase andFrequency modulation : PM & FM signals; narrows bandFM; generation & detection of FM and PM, Deemphasis,Preemphasis. CW modulation system : Superhetrodynereceivers, AM receivers, communication receivers, FMreceivers, phase locked loop, SSB receiver Signal to noiseratio calculation or AM and FM receivers.ECE8

Question 9

1. Control Systems :

Answer 9

Elements of control systems; block-diagramrepresentations; open-loop & closed-loop systems; principlesand applications of feed-back. Control system component

Question 10

2.lVIicroprocessors and lVIicrocomputers :

Answer 10

PC organisation; CPU, instruction set, register settimingdiagram, programming, interrupts, memory interfacing, J/0interfacing, programmable peripheral devices.ECE10

Question 11

3. Measurement and Instrumentation:

Answer 11

Error analysis; measurement of current voltage, power,energy, power-factor, resistance, inductance, capacitance andfrequency; bridge measurements. Signal conditioning circuit;Electronic measuring instruments : multimeter, CRO, digitalvoltmeter, frequency counter, Q-meter, spectrum-analyser,distoration-meter. Transducers : thermocouple, thermistor,LVDT, strain-guage, piezo-electric crystal.ECE 11

Question 12

4. Power Sysrems: Analysis and Control:

Answer 12

Steady-state performance of overhead transmissionlines and cables; principles of active and reactive powertransfer and distribution; per-unit quantities; bus admittanceand impedance matrices; load t1ow; voltage control and powerfactor correction; economic operation; symmetricalcomponents, analysis of symmetrical and unsymmetricalfaults. Concepts of system stability: swing curves and equalarea criterion. Static VAR system. Basic concepts of HVDCtransmission.ECE12

Question 13

5. Power System Protection :

Answer 13

Principles of overcurrent, differential and di stanceprotection. Concept of solid state relays. Circuit brakers.Computer aided protection : introduction; line, bus, generator,transformer protection; numeric relays and application of DSPto protection.ECE13

Question 14

6. Digital Communication:

Answer 14

Pulse code modulation (PCM), defferential pulse codemodulation (DPCM), delta modulation (DM), Digitalmodulation and demodulation schemes : amplitude, phase andfrequency keying schemes (ASK, PSK, FSK). Error controlcoding : error detection and correction, linear block codes,convolation codes. lnforrnation measure and source coding.Data networks, ?-layer architecture.ECE14