GTU Power Electronics And Industrial Drives - June 2015 Exam Question Paper

GTU Electrical and Electronic Engineering (Semester 7)
Power Electronics And Industrial Drives
June 2015

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) Draw and explain the structure of IGBT. Also, explain principle of operation and I-V Characteristics of IGBT.

7 M

1 (b) Explain about the construction, characteristics and gate drive requirements of SCR.

7 M

2 (a) Classify the power factor improvement methods for phase controlled rectifiers. Explain any one.

7 M

Answer any two question from Q2 (b) or Q2 (c)

2 (b) Draw and explain full wave controlled rectifier with the inductive load using required waveforms and equations.

7 M

2 (c) Explain the operation of single phase, half wave and controlled rectifier with R load using waveforms. Also, derive the average and RMS value of the output voltage.

7 M

Answer any two question from Q3 (a), (b) or Q3 (c), (d)

3 (a) Briefly describe the operation of single phase cyclo-converter with necessary waveform.

7 M

3 (b) Derive the equation of output voltage for on/off AC voltage controller. Draw neat sketch of circuit diagram and waveform.

7 M

3 (c) Discuss operation of three phase AC-AC converter with star connected resistive load.

7 M

3 (d) Discuss operation of three-phase inverter in 180o mode of conduction.

7 M

Answer any two question from Q4 (a), (b) or Q4 (c), (d)

4 (a) Discuss about choice of A.C. and D.C. drives in detail.

7 M

4 (b) Explain the selective harmonic elimination technique for VSI.

7 M

4 (c) Discuss about controlled rectifier and DC-DC converter fed drive.

7 M

4 (d) Discuss the class B operation of Chopper Circuit.

7 M

Answer any two question from Q5 (a), (b) or Q5 (c), (d)

5 (a) Classify synchronous motor drives. Explain brushless DC and AC motor.

7 M

5 (b) Discuss the rotor voltage control for slip ring induction motor.

7 M

5 (c) Explain V/f control of induction motor drives Give its merits and demerits.

7 M

5 (d) Explain slip-power recovery by Static Scherbius method for speed control of induction motor.

7 M

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