GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI (Old) EXAMINATION - WINTER 2019
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Subject Code: 160902 Date: 16/12/2019Subject Name: Power Electronics - 11
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Explain the working of single phase half bridge inverter for RL load with necessary waveforms and diagram. 07
(b) Describe the working of series inverter with diagram and waveforms. 07
Q.2 (a) Explain with diagram working of single phase auto sequential commutated current source inverter with diagram and waveforms. 07
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(b) Compare in detail the voltage source inverter and current source inverter. 07OR
(b) Compare various PWM techniques used for inverter. 07
Q.3 (a) Explain working of Matrix converter with diagram. 07
(b) Explain working of single phase electronic tap changer used for transformer. 07
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OR
Q.3 (a) Compare in detail cyclo converter with DC link converter. 07
(b) Discuss operation of three phase full wave controller with Y and A connected loads. 07
Q.4 (a) Explain constant flux and constant current operation of induction motor. 07
(b) Draw and explain close-loop circuits for stator voltage control of induction motor. 07
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OR
Q.4 (a) Discuss about self-controlled synchronous motor drive. 07
(b) Explain in detail selection of drive. 07
Q.5 (a) Write short note on HVDC. 07
(b) Explain static excitation system of an alternator. 07
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OR
Q.5 (a) Explain v/f control of induction motor. 07
(b) Write short note on Battery charger. 07
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