GTU Power Electronics And Industrial Drives - June 2014 Exam Question Paper

GTU Electrical and Electronic Engineering (Semester 7)
Power Electronics And Industrial Drives
June 2014

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) Briefly state and discuss the various schematics of single phase AC to AC voltage controller.

7 M

1 (b) Explain full wave controller with R-L load. Draw the necessary wave-form.

7 M

2 (a) Draw the schematic arrangement of full wave rectifier with R-L load and back EMF E. Draw its waveform for load voltage V_L and Load Current I_L. Write down the formulae for RMS diode current I_r, and average diode current I_d. for discontinuous load current.

7 M

Answer any two question from Q2 (b) or Q2 (c)

2 (b) Briefly explain the voltage protection by selenium diode and metal oxide varistors.

7 M

2 (c) Briefly explain the gate driver circuits for thyristors.

7 M

Answer any two question from Q3 (a), (b) or Q3 (c), (d)

3 (a) What is VSI ? Describe the operation of single phase half bridge VSI. Also state the switching state table for the same.

7 M

3 (b) Briefly discuss the operation of on off controller with neat sketch of its waveform.

7 M

3 (c) Explain the operation of 4 switch Single Phase Inverter with usual notations.

7 M

3 (d) What is cyclo converter ? state the area of its application. Briefly discuss the operation of single phase cyclo converter along with its voltage and current waveform for resistive load.

7 M

Answer any two question from Q4 (a), (b) or Q4 (c), (d)

4 (a) Explain the selective harmonic elimination technique for VSI.

7 M

4 (b) Briefly discuss the 120 degree operation of inverter circuit with appropriate waveforms.

7 M

4 (c) Discuss the class B operation of Chopper Circuit.

7 M

4 (d) Give comparison between current source inverter and voltage source inverter.

7 M

Answer any two question from Q5 (a), (b) or Q5 (c), (d)

5 (a) Explain slip-power recovery by Static Scherbius method for speed control of induction motor.

7 M

5 (b) Explain V/f control of induction motor drives Give its merits and demerits.

7 M

5 (c) Discuss the rotor voltage control for slip ring induction motor.

7 M

5 (d) Discuss about choice of AC and DC drive in detail.

7 M

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