Q.1 Define the following:-
(1) Reverse recovery Charge (2) Latching Current (3) Holding Current (4) Softness Factor 08
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Q.2 Draw the symbols, V-I characteristics and give one application of following devices: 06
(1) IGBT (2) GTO (3) TRIAC
Q.3 Explain operation of series connected thyristors in detail. 07
Q.3 Explain parallel operation of thyristor in detail. 07
OR
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Explain the operation of DC Chopper’s principal of operation 07
Q.4 Briefly discuss switching behavior of a GTO 07
Q.4 Discuss Pulse Width Modulated Inverter 07
OR
Compare single phase half wave controlled bridge rectifier with Resistive load 07
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(symmetrical configuration) from single phase half controlled bridge rectifier with
Resistive Inductive load (symmetrical configuration) using the following asked
performance parameter:- [Sketch must be meatly drawn].
- Average load voltage along with waveform
- Average load current along with waveform
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Q.5 A highly inductive d.c. load requires 12A at 150V from 230V single phase a.c. supply. Give 07
the design details for this requirement using B-2 connection for 0=30°. Assume each SCR
to have a voltage drop of 1.5 V. Draw the respective waveforms of load voltage and load
current.
OR
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Derive an expression for :-
a) Average load voltage
b) Average load current
¢) RMS load voltage
For bi-phase half wave circuit with resistive load. Compare the waveforms of the same
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circuit with resistive and inductive load for the given firing angles of 60°, 90°, 150°.
Q.5 Compare dielectric heating and induction heating 07
OR
With an appropriate power diagram, discuss the principle of working of three phase 07
bridge inverter. Draw phase and line voltage waveforms on the assumption that each
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thyristor conducts for 180°and resistive load is star connected.
With the help of a neat circuit diagram and associated waveforms, discuss the operation of 07
Buck-Boost converter. List the advantages and disadvantages of this type of converter.
With the help of basic structural diagram explain the operation of DIAC and TRIAC 07
Enlist and explain the performance parameters of Inverters 07
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OR
Describe switched mode power supply with necessary details using diagram 07
Explain battery charger with necessary diagrams 07
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