Question Paper: Power Electronics 2 Question Paper - May 17 - Electronics Engineering (Semester 7) - Mumbai University (MU)
Power Electronics 2 - May 17
Electronics Engineering (Semester 7)
Total marks: 80
Total time: 3 Hours
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.
Q1) Attempt any four questions
What are the advantages of SVM over the conventional Sine wave PWM? Explain.
Compare various schemes of DC motor speed control.
With the help of neat sketch, explain the working of single-phase half-wave semi converter.
Explain the concept of battery charging systems.
What is V’F Control? Explain in detail.
Draw and Explain the State Space model for DC-DC Buck converter in detail.
Explain in detail the principle and working o simple boost converter with the help of neat circuit
diagram and waveform.
Describe the effect of source inductance in 1-phase and 3-phase rectifiers. Draw relevant circuit
diagrams and waveforms.
Explain in detail the Multiple PWM as used for inverters.
A 220V, 1500 rpm, 10A separately excited DC motor has armature resistance of 1 ohm. It is fed
from a single phase fully controlled bride rectifier with an ac source voltage of 230, 50Hz. Assuming
continuous load, compute:
i) Motor speed of firing angle of 45 degrees and at a speed of 1000 rpm.
ii) Torque at firing angle of 55 degrees and at a speed of 1000 rpm.
Explain dynamic and regenerative braking of DC motors.
With the help of neat waveform explain the torque speed characteristic of induction motor and give
detail description of forward regeneration, forward motoring and reverse plugging.
Explain the working principle of stepper motor. What are the different types of stepper motors?
Discuss in detail permanent magnet stepper motor.