1
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER EXAMINATION SUMMER 2017
Subject Code: X50903 Date: 04/05/2017
Subject Name: Power Electronics-II
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.
Q.1

Explain 1200 conduction of three phase inverter connected with Δ connected resistive load.
07

Discuss 1-phase parallel inverter.
07
Q.2

Explain SVPWM technique. Discuss their advantages over other PWM techniques.
07

How the 5th and 7th harmonics can be eliminated using selected harmonic elimination technique?
07
OR

Explain hysteresis band PWM technique. Compare it with sine PWM technique.
07
Q.3

Discuss 3-phase full wave controller with connected R-L load.
07

Discuss 3-phase current source inverter (CSI). Compare it with VSI.
07
OR
Q.3

Explain operation of AC voltage controller with PWM control.
07

Explain basic principle of matrix converter.
07
Q.4

Explain load commutated cycloconverter.
07

Discuss V/f induction motor drive in closed loop configuration.
OR
Q.4

Explain output harmonics in cycloconverter.
07

Explain slip power recovery control in 3-phase wound rotor IM drive.
07
Q.5

Explain self controlled synchronous motor drive using load commutated thyristor inverter.
07

Explain application of power electronics in FACTs devices.
07
OR
Q.5

Explain self controlled synchronous motor drive using cycloconverter.
07

Explain static excitation system of alternators.
07