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

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 5th Sem Old 150903 Power Electronics I Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? V(OLD) EXAMINATION ? SUMMER 2019
Subject Code: 150903 Date:31/05/2019

Subject Name: Power Electronics - I

Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

Q.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

Q.2 (a) Describe the working of UJT Relaxation Oscillator circuit. 07
(b) Explain Class - B commutation method with necessary diagrams. 07
OR
(b) Discuss the effect of source inductance on the average output voltage of a single
phase full converter.
07

Q.3 (a) Explain working of single phase full wave converter using SCRs connected to
RL load with free wheeling diode. Draw necessary waveforms.
07
(b) Discuss the single phase dual converter with regard to principle of operation and
application.
07
OR
Q.3 (a) Discuss the construction and operation of IGBT. 07
(b) Describe triggering of TRIAC using DIAC. 07

Q.4 (a) Draw the circuit configuration of step down chopper and explain its working.
Derive its output voltage equation.
07
(b) Draw the circuit diagram and explain the working of Morgan?s chopper. 07
OR
Q.4 (a) Explain the classification of chopper circuits based on principle of operation,
construction etc.
07
(b) Write a short note on CUK converter. 07

Q.5 (a) Explain constant HP constant Torque method of speed control of motor. 07
(b) List different methods of braking dc motor. Describe regenerative braking
scheme.
07
OR

Q.5 (a) Explain single phase dual converter drive for dc motor. 07
(b) Discuss the principle of phase lock loop control of d.c drives. List the
advantages of phase lock loop control of d.c drives.
07
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