Download GTU BE/B.Tech 2018 Winter 7th Sem Old 172401 Power Electronics Systems Modelling Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 7th Sem Old 172401 Power Electronics Systems Modelling Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VII (OLD) EXAMINATION ? WINTER 2018
Subject Code: 172401 Date: 29/11/2018

Subject Name: Power Electronics Systems Modelling

Time: 10:30 AM TO 01:00 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) What is the requirement of normalization? Explain normalization w.r.t.
frequency.
07
(b) Explain the working of the buck converter with neat circuit diagram and
necessary waveforms. Draw the graph for DC conversion ratio M(D) versus duty
cycle.
07

Q.2 (a) What is mathematical modeling? Draw and explain the block diagram of Power
Electronics System with reference to modeling.
07
(b) State and explain inductor voltage-second balance principle. 07
OR
(b) State and explain capacitor charge balance principle. 07

Q.3 (a) Derive the state-space model of a Boost converter. 07
(b) Explain the difference between ideal and physical models of AC transformer. 07
OR
Q.3 (a) Derive the state-space model of a Buck-Boost converter. 07
(b) Explain DC transformer model with necessary equations and figures. 07

Q.4 (a) Develop the model of a DC motor. 07
(b) Explain: Controllability, Observability and normalized model. 07
OR
Q.4 (a) List and explain the major steps of engineering design process. 07
(b) What do you mean by small signal approximation? Explain with appropriate
example.
07

Q.5 (a) Explain the modelling of PWM inverter. 07
(b) Discuss the objectives of AC modeling and the concept of non-linearity
introduced due to switching.
07
OR

Q.5 (a) Explain the state space model of a full bridge inverter. 07
(b) What is feed forward control? Explain the basic working concept and its requirement
in a control loop.
07

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