STUPIDSID
Solve any one question from Q.1(a,b) & Q.2(a,b)
1(a)
Describe working of single bridge coneverter with R load Draw waveforms of load voltage, load current.
5 M
1(b)
How ac voltage regulators are classified? Explain single phase ac regulator feeding indactive load. Draw output voltage waveform.
5 M
2(a)
Draw & Explain Gate Characteristics of SCR.
5 M
2(b)
Explain the followig ratings of the thyristor.
i) Latching current
ii) Holding current
i) Latching current
ii) Holding current
5 M
Solve any one question from Q.3(a,b) & Q.4(a,b)
3(a)
Explain working of three phase full converter with a firing angle of 30° & obtain expression for phase voltage & Line voltage.
5 M
3(b)
State and explain the effect source inductance on operation of converter.
5 M
4(a)
Draw and explain single phase semi converter with output waveforms with RL load.
5 M
4(b)
Explain R-C triggering circuit of Thyristor.
5 M
Solve any one question from Q.5(a,b) & Q.6(a,b)
5(a)
Explain Class E chopper feeding RLE load in detail.
8 M
5(b)
Describe the basic structure of MCT. Give its equivalent circuit and explain the turn on and turn of pocesses.
8 M
6(a)
What is time ration control in dc choppers? Explain the use of TRC for controlling the output voltage in choppers.
8 M
6(b)
For Type A chopper the supply voltage is 230V, load resistance being 10Ω for the duty cycle oof 40%. Find the average and rms values of the output voltage and chopper efficiency by taking voltage drop of 2 V across the chopper during ON condition.
8 M
Solve any one question from Q.7(a,b) & Q.8(a,b)
7(a)
Explain with circuit diagram and waveforms operation of single phase current source inverter.
8 M
7(b)
Explain Sinusoidal Pulse width modulation with necessary waveforms.
8 M
8(a)
Explain with circuti diagram and waveforms operation of single phase current source inverter.
8 M
8(b)
Derive expression for output voltage in single pulse Modulation by Fourier analysis.
8 M
Solve any one question from Q.9(a,b) & Q.10(a,b)
9(a)
Explain working of three phase six step voltage source inverter in 120° mode of operation. For star connected load draw output voltage waveforms. Show devices conducting in each step.
10 M
9(b)
Compare Multilevel inverter and Multi Pulse Inverter.
8 M
10(a)
Draw a neat diagram and explain cascaded mutiplier inverter.
8 M
10(b)
Explain working of three phase six step voltage source inverter in 180° mode of operation. For star connected load draw output voltage waveforms. Show devices conducting in each step.
10 M
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