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C7056

PART C

Answer any two full questions, each carries10 marks.
Draw the circuit of 3 phase fully controlled rectifier with RLE load and explain
the working for a=60° with necessary waveforms. Derive the expression for
output voltage.
Explain the operation of 3 phase voltage source inverter with 180° mode of
operation.
Explain how two 3 phase full converters can be connected back to back to form
a circulating current type of dual converter with the help of waveforms.

PART D
Answer any two full questions, each carries 10 marks.

For a single phase voltage controller feeding a resistive load, describe the
working with reference to source voltage, source current, output voltage and
output current.

Describe the working of four quadrant chopper with relevant circuit diagrams
and its operation in all the four quadrants.

Explain with circuit diagram and waveforms, the working of Buck regulator for

continuous current mode. Obtain expressions for inductance and capacitance.
‏اد اد‎ ೫ ‏اد‎

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