Gujarat Technological UniversitySummer 2024 examination

GTU 3151106 Power Electronics Summer 2024 Question Paper & PDF

B.E. · EC Engineering · Semester 5 · Subject code 3151106
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Total
70 marks
To pass
23 marks (33%)
Duration
2.5 Hours 2:30 PM – 5:00 PM
Questions
5 with internal choice
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Q.1

14 Marks
(a)
3 marks
Explain the basic requirements for the successful firing of SCR.
(b)
4 marks

Explain the structure and various triggering modes of operation of TRIAC.

(c)
7 marks

The half wave controlled rectifier has purely resistive load of R and delay angle α = 600 determine.

i)Rectification efficiency
ii)Form factor and
iii)Ripple factor.

Q.2

14 Marks
(a)
3 marks
Compare natural and forced commutations of SCR.
(b)
4 marks
Explain the various Turn-On methods of SCR in brief.
(c)
7 marks

Derive the average load voltage and load current equations of single phase half wave controlled rectifier with resistive and inductive load.

(c)
7 marks

A dc chopper operates on 300V dc and frequency of 200 Hz, feeds an R-L load. Determine the ON times of the chopper for output voltage of 150V.

Q.3

14 Marks
(a)
3 marks

Draw the schematic of step-up chopper and derive an expression for output voltage of chopper.

(b)
4 marks

Compare the Time Ratio control and current limit control strategies of chopper.

(c)
7 marks

With help of neat circuit diagram and waveforms, explain the operation of single phase half bridge voltage source inverter with resistive load.

(a)
3 marks

What are the applications of chopper? Explain the working of class A chopper.

(b)
4 marks
Explain the multiphase chopper.
(c)
7 marks

With help of neat circuit diagram and waveforms, explain the operation of single phase full bridge square wave inverter with resistive load.

Q.4

14 Marks
(a)
3 marks
Explain the dv/dt and di/dt ratings of SCR.
(b)
4 marks
What is commutation? Explain class D forced commutation.
(c)
7 marks

Design the basic structure of MCT and explain its turn on and turn off operations.

(a)
3 marks

Explain the internal control pulse width modulation control method of inverter.

(b)
4 marks
Compare IGBT and Power MOSFET.
(c)
7 marks

Design the structure of MOSFET and explain its operation and V-I characteristics.

Q.5

14 Marks
(a)
3 marks
Compare General Power supply and SMPS.
(b)
4 marks
Explain the working of fly back converter SMPS.
(c)
7 marks

With help of block diagram, explain the operation of on line UPS. List the important specifications of on line UPS.

(a)
3 marks
What do you mean by EMI and EMC?
(b)
4 marks
Explain the working of induction motor.
(c)
7 marks
Write short note on permanent magnet stepper motor drive.

More Power Electronics papers

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Other Semester 5 subjects

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Analog and Digital Communication
3151105
VLSI Design

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About this paper

Official Gujarat Technological University (GTU) examination paper for Power Electronics (Summer 2024, B.E. · EC Engineering, Sem 5). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.

Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.

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