Download GTU BE/B.Tech 2019 Summer 5th Sem New 2152407 Power Electronic Circuits I Question Paper

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Subject Code: 2152407

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE - SEMESTER-V (NEW) EXAMINATION - SUMMER 2019

Subject Name: Power Electronic Circuits-I

Time: 02:30 PM TO 05:00 PM

Instructions:

1. Attempt all questions.

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

Q.1

1. (a) Explain various operating modes of Power BJT. (MARKS 03)
2. (b) Define and explain latching current of SCR. (MARKS 04)

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3. (c) Explain construction and working of IGBT with neat diagram. (MARKS 07)

Q.2

1. (a) Explain the concept of pulse width modulation. (MARKS 03)
2. (b) What is di/dt protection for SCR? Explain. (MARKS 04)
3. (c) Write a short note on dual converter. (MARKS 07)

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OR

1. (c) Write a short note on Multiphase Chopper circuit. (MARKS 07)

Q.3

1. (a) Draw and explain working of UJT relaxation oscillator circuit. (MARKS 03)
2. (b) Compare half wave uncontrolled rectifier with full wave uncontrolled rectifier in all respect. (MARKS 04)

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3. (c) Write a short note on three phase half wave uncontrolled rectifier circuit. (MARKS 07)

OR

1. (a) What is phase angle control? Explain. (MARKS 03)
2. (b) What is function of type B chopper circuit? Explain. (MARKS 04)
3. (c) Explain working of single phase full bridge uncontrolled rectifier circuit with neat diagram. (MARKS 07)

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Q.4

1. (a) What is Continuous conduction mode operation of DC-DC converter? Explain. (MARKS 03)
2. (b) What is difference between Flyback and Forward DC-DC converter? (MARKS 04)
3. (c) Explain working of full wave semi-controlled converter circuit with neat diagram. (MARKS 07)

OR

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1. (a) What is Time ratio control? (MARKS 03)
2. (b) Explain difference in isolated and non-isolated type DC-DC converters. (MARKS 04)
3. (c) Discuss working principle of Buck type DC-DC converter circuit with diagram and waveforms. (MARKS 07)

Q.5

1. (a) Draw only circuit diagram & waveforms for Jones chopper. (MARKS 03)

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2. (b) Explain Hard switching of the Power BJT device. (MARKS 04)
3. (c) Discuss operation of Push-Pull type isolated DC-DC converter with necessary diagrams. (MARKS 07)

OR

1. (a) Explain basic concept of ZVS. (MARKS 03)
2. (b) Draw and explain characteristics of four quadrant chopper. (MARKS 04)

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3. (c) Write a brief note on L type Buck resonant converter with appropriate waveforms. (MARKS 07)

Date: 20/06/2019

Total Marks: 70

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