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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER VII- EXAMINATION SUMMER 2017
Subject Code: X70905 Date: 05/05/2017
Subject Name: Advanced Power Electronics I
Time: 02.30PM to 05.00PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Draw the figures and waveforms wherever necessary.
Q.1

Explain construction and working of parallel resonant inverter along with the required waveforms.
07

Compare ZCS and ZVS.
07
Q.2

Explain 3-level Diode Clamped multilevel inverter in terms of its construction and working.
07

List out the benefits of multilevel converter over multipulse converter. Explain Flying capacitor multilevel inverter.
07
OR

Explain Class E resonant inverter with neat circuit diagram along with its wave forms.
07
Q.3

Explain the working of 12-pulse converter with its circuit diagram and also explain its benefits over 6-pulse converter.
07

Write a short note on permanent magnet machine drive having Trapezoidal flux distribution.
07
OR
Q.3

Explain construction and working of 5-level Cascaded multilevel inverter.
07

Analyze the operation 6-pulse rectifier in the presence of source inductance with needed waveforms.
07
Q.4

Explain the working of Fly back converter with an appropriate circuit diagram.
07

Write a short note on Brushless DC Drives.
07
OR
Q.4

Explain the working of Forward converter with an appropriate circuit diagram.
07

Write a short note on Switched reluctance motor drive.
07
Q.5

Explain the construction and working of Bidirectional AC Power supplies with an appropriate circuit diagram.
07

Write a short note on Stepper motor.
07
OR
Q.5

Compare on-line UPS with off-line UPS, drawing neat figure.
07

Give comparison of multiple pulse converters with multilevel converter.
07