Download GTU BE/B.Tech 2019 Summer 5th Sem Old 150903 Power Electronics I Question Paper

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Subject Code: 150903

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- V(OLD) EXAMINATION - SUMMER 2019

Subject Name: Power Electronics - I

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Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. (a) Describe the switching on characteristics of SCR with a neat diagram. [07]
   (b) Discuss the problems and remedies for parallel connection of SCR. [07]
2. (a) Describe the working of UJT Relaxation Oscillator circuit. [07]
   

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   (b) Explain Class - B commutation method with necessary diagrams. [07]
   OR
   (a) Discuss the effect of source inductance on the average output voltage of a single phase full converter. [07]
   (b) Explain working of single phase full wave converter using SCRs connected to RL load with free wheeling diode. Draw necessary waveforms. [07]
3. (a) Discuss the single phase dual converter with regard to principle of operation and application. [07]
   

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   OR
   (b) Discuss the construction and operation of IGBT. [07]
4. (a) Describe triggering of TRIAC using DIAC. [07]
   (b) Draw the circuit configuration of step down chopper and explain its working. Derive its output voltage equation. [07]
   OR
   

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   (a) Draw the circuit diagram and explain the working of Morgan’s chopper. [07]
   (b) Explain the classification of chopper circuits based on principle of operation, construction etc. [07]
5. (a) Write a short note on CUK converter. [07]
   (b) Explain constant HP constant Torque method of speed control of motor. [07]
   OR
   

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   (a) List different methods of braking dc motor. Describe regenerative braking scheme. [07]
   (b) Explain single phase dual converter drive for dc motor. [07]

List the advantages of phase lock loop control of d.c drives. [07]

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