T.E. (E & TC Engineering) Power device and circuit previous year question paper

T.E. (E & TC Engineering) T.E. (E & TC Engineering) POWER device AND CIRCUIT (Semester-II) Q1) a) with wavefrom techniques in inverter? Explain Multiple PWM technique waveforms. b) Give the classification of inverters?Draw Three Phase voltage source inverter for balanced star R load? [5] c) Explain working of single phase full bridge inverter for R load with inputs & output waveforms. Derive an expression for rms o/p voltage. OR Q2) a) Draw a three phase inverter for balanced star R load? Explain its operation of 120° mode with gate signals & output waveforms.[12] Q3) a) Explain with neat diagram the operation of 4 quadrant with de motor as a load. in [8] b) Explain operation of step up chopper with circuit diagram and derive an expression for its o/p voltage: Vo=- Vs (1-D) where D is duty cycle.[6] c) A step down DC chopper has a resistive load of R = 15 2 and input voltage Ede=200V. The chopper frequency is IKHz. If the duty c...