Power Electronics 2 Question Paper - May 17 - Electronics Engineering (Semester 7)

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yashbeer ★ 11k

Power Electronics 2 - May 17

Electronics Engineering (Semester 7)

Total marks: 80
Total time: 3 Hours INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.

Q1) Attempt any four questions

1(a) What are the advantages of SVM over the conventional Sine wave PWM? Explain.

(5 marks) 00

1(b) Compare various schemes of DC motor speed control.

(5 marks) 1192 1193 1194

1(c) With the help of neat sketch, explain the working of single-phase half-wave semi converter.

(5 marks) 1184

1(d) Explain the concept of battery charging systems.

(5 marks) 1179

1(e) What is V’F Control? Explain in detail.

(5 marks) 1193

2(a) Draw and Explain the State Space model for DC-DC Buck converter in detail.

(10 marks) 1169

2(b) Explain in detail the principle and working o simple boost converter with the help of neat circuit diagram and waveform.

(10 marks) 1170

3(a) Describe the effect of source inductance in 1-phase and 3-phase rectifiers. Draw relevant circuit diagrams and waveforms.

(10 marks) 1164 1165

3(b) Explain in detail the Multiple PWM as used for inverters.

(10 marks) 1166

4(a) 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.

(10 marks) 1187

4(b) Explain dynamic and regenerative braking of DC motors.

(10 marks) 1190 1191

5(a) 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.

(10 marks) 1192

5(b) Explain the working principle of stepper motor. What are the different types of stepper motors? Discuss in detail permanent magnet stepper motor.

(10 marks) 00

Q6. Write short notes on

6(a) SMPS & UPS.

(5 marks) 1172 1177

6(b) Kramer’s Drive.

(5 marks) 1197

6(c) Induction heating.

(5 marks) 1180

6(d) Harmonics reduction in inverters.

(5 marks) 1166

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