STUPIDSID
Solve any four:
1 (a)
Compare SCR, IGBT with various parameters.
5 M
1 (b)
Explain UJT with basic construction.
5 M
1 (c)
Write a short note on brushless DC motor.
5 M
1 (d)
Write a protection scheme for over voltage for SCR.
5 M
1 (e)
Compare series and parallel inverter.
5 M
2 (a)
List out various triggering methods of SCR. Explain RC triggering of SCR with diagram.
10 M
2 (b)
What is communication SCR? Explain class C type of commutation with neat waveforms.
10 M
3 (a)
Explain asymmetric semi-converter along with waveforms for α=45°.
10 M
3 (b)
Explain fan regulator with disc-TRIAC scheme.
10 M
4 (a)
Draw and explain H-Bridge inverter, with neat waveform, using IGBT.
10 M
4 (b)
Explain series inverter. Write down its merits and demerits.
10 M
5 (a)
Explain Buck converter. Derive the expression for selection of inductor.
10 M
5 (b)
Explain working principle of induction heating. Give example and write down its merits and demerits.
10 M
6
Design an AC power control for firing angle of 90° to supply ac voltage to a resistive load of 10Ω from 230v, 50Hz mains supply. Use SCR-UJT circuit. No temp. Compensation resistor is required. (Use UJT 2N 2646).
20 M
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