STUPIDSID
Solve any one question from Q.1(a,b,c) &Q.2(a,b,c)
1(a)
Draw steady state characteritics of SCR. Explain IL, IH, VBO, VBR, & show them on the characteristics.
7 M
1(b)
Explain two transistor analogy of an SCR. Drive anode current equation of SCR.
7 M
1(c)
Draw the circuit diagram of Gate Drive circuit for IGBT. Explain its operation.
6 M
2(a)
Draw the construction of Power MOSFET and explain steady state characteristics of Power MOSFET. Compare it with SCR and IGBT.
7 M
2(b)
Explain 180 degree conduction method of three phase Voltage Source Inverter for balanced star connected resistive load.
6 M
2(c)
Draw the circuit diagram of single phase Full Controlled Bridge rectifier with R-L load. Explain its operation. Draw the waverform of output voltage and Current.
7 M
Solve any one question from Q.3(a,b) &Q.4(a,b)
3(a)
What is DC to DC converter? Explain different methods for controlling the output voltage of Chopper.
9 M
3(b)
Draw the circuit diagram of single phase AC Voltage controller with R load. Explain its operation. Draw the waveform of output voltage.
9 M
4(a)
In a dc chopper, the average load current is 30 Amps, chopping frequency is 250Hz, supply volatge is 110 volts. Calculate ON and OFF periods of the chopper if the load resistance is 2 ohms.
9 M
4(b)
Draw the block schematic of SMPS and explain its advantages over Linear Power Supply.
9 M
Solve any one question from Q.5(a,b) &Q.6(a,b)
5(a)
Explain On-line UPS with neat block diagram. State its specifications and applications.
6 M
5(b)
Explain with circuit diagram working of single phase seperately excited DC motor derive. Draw neat waveforms across load.
10 M
6(a)
Compare ON-Line & OFF-Line UPS. Justify why ON-Line UPS is better.
8 M
6(b)
Explain electronic ballast. What are the advantages of fluorescent lamp over conventional lamp?
8 M
Solve any one question from Q.7(a,b) & Q.8(a,b)
7(a)
Explain SLR half bridge DC/DC converter with neat circuit diagram and Waveforms.
8 M
7(b)
Explain dv/dt, di/dt and snubber circuit in detail.
8 M
8(a)
Explain with circuti diagram and neat waveforms ZCS resonant converters.
10 M
8(b)
Explain overvoltage and over current protection circuits.
6 M
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