Hindi - Himachal Pradesh

of transformer neutral in three phase transformations, Scott connections, three-phase to sixphasetransformation. Principles of energy conversion-d.c. generators and motors: Performancecharacteristics, starting arid speed control armature reaction and commutation; three-phaseinduction motor; performance characteristics, starting and speed control. Single-phase capacitorstart & run induction motor. Synchronous generators: performance characteristics, regulation,parallel operation. Synchronous motors: starting characteristics, applications; synchronouscondenser. FHP motors, permanent magnet and stepper motors, brushless d.c. motors, singlephasereluctance motors, Universal motor and hysteresis motor.Power Electronics And Electric Drives: Semiconductor power devices: diode, Power transistor,thyristor, triac, Diac, GTO, IGBT, RCT, MCT, SITh, SIT and MOSFET, static & dynamiccharacteristics, and principles of operation; triggering circuits; phase control rectifiers; bridgeconverters; fully controlled and half controlled; principles of thyristor choppers and inverters;basic concepts of speed control of DC and AC motor drives. Application of variable speeddrives.Analog Communication: Random variables: continuous, discrete; Probability; probabilityfunctions. Statistical averages; probability models; random signals and noise; white noise, noiseequivalent; bandwidth; signal transmission with noise; signal to noise ratio. Linear CWmodulation: Amplitude modulation: DSB, DSB-SC and SSB. Modulators and Demodulators;phase and frequency modulation: PM and FM signals; narrowband FM; generation anddetection of FM and PM. CW modulation system: Superhetrodyne receivers, AM receivers,communication receivers, FM receivers, phase locked loop, SSB receiver. Signal to noise ratiocalculation for AM and FM receivers.PAPER-IIControl Systems:Elements of control systems; block-diagram representation; open-loop & closed-loop systems;principles and applications of feedback. LTI systems: time-domain and transform-domainanalysis. Stability: Routh Hurwitz criterion, root-loci, Nyquist’s criterion, Bode-plots, Design oflead- lad compensators. Proportional, PI, PID controllers. State-variable representation andanalysis of control systems. Principles of discrete-control systems.Electrical Engineering Materials:Electrical and electronic behaviour of materials; conductivity; free-electrons and band theory;intrinsic and extrinsic semiconductor, p-n junction; solar cells, super-conductivity. Dielectricbehaviour of materials; polarization phenomena; piezo-electric phenomena. Magnetic materials;behaviour and application. Photonic materials: refractive index, absorption and emission oflight, optical fibres, lasersMicroprocessors and Microcomputers:16-bit microprocessor: architecture, CPU, module design, memory interfacing, I/O, Peripheralcontrollers, Multiprocessing. PC architecture: overview, Advanced microprocessors.Measurement and Instrumentation:Error analysis; measurement of current; voltage, power, energy, power-factor, resistance,inductance, capacitance and frequency; bridge measurements Electronic measuring instruments;multimeter, CRO, digital voltmeter, frequency counter, Q-meter, spectrum- analyser, distortionmeter.Transducers: thermocouple, thermistor, LVDT, strain-gauge, piezo-electric crystal. Useof transducers in measurements of non-electrical quantities. Data-acquisition systems.