GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (OLD) EXAMINATION — WINTER 2018
Subject Name: Power Electronics Systems Modelling
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
3. Figures to the right indicate full marks.
Q.1 (a) What is the requirement of normalization? Explain normalization w.r.t. frequency.
(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.
Q.2 (a) What is mathematical modeling? Draw and explain the block diagram of Power Electronics System with reference to modeling.
OR
(b) State and explain capacitor charge balance principle.
Q.3 (a) Derive the state-space model of a Boost converter.
(b) Explain the difference between ideal and physical models of AC transformer.
Q.3 (a) Derive the state-space model of a Buck-Boost converter.
(b) Explain DC transformer model with necessary equations and figures.
Q.4 (a) Develop the model of a DC motor.
(b) Explain: Controllability, Observability and normalized model.
Q.4 (a) List and explain the major steps of engineering design process.
(b) What do you mean by small signal approximation? Explain with appropriate example.
Q.5 (a) Explain the modelling of PWM inverter.
(b) Discuss the objectives of AC modeling and the concept of non-linearity introduced due to switching.
Q.5 (a) Explain the state space model of a full bridge inverter.
(b) What is feed forward control? Explain the basic working concept and its requirement in a control loop.
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (OLD) EXAMINATION — WINTER 2018
--- Content provided by FirstRanker.com ---
Subject Code: 172401 Date: 29/11/2018Subject Name: Power Electronics Systems Modelling
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
--- Content provided by FirstRanker.com ---
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.
(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.
Q.2 (a) What is mathematical modeling? Draw and explain the block diagram of Power Electronics System with reference to modeling.
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(b) State and explain inductor voltage-second balance principle.OR
(b) State and explain capacitor charge balance principle.
Q.3 (a) Derive the state-space model of a Boost converter.
(b) Explain the difference between ideal and physical models of AC transformer.
--- Content provided by FirstRanker.com ---
ORQ.3 (a) Derive the state-space model of a Buck-Boost converter.
(b) Explain DC transformer model with necessary equations and figures.
Q.4 (a) Develop the model of a DC motor.
(b) Explain: Controllability, Observability and normalized model.
--- Content provided by FirstRanker.com ---
ORQ.4 (a) List and explain the major steps of engineering design process.
(b) What do you mean by small signal approximation? Explain with appropriate example.
Q.5 (a) Explain the modelling of PWM inverter.
(b) Discuss the objectives of AC modeling and the concept of non-linearity introduced due to switching.
--- Content provided by FirstRanker.com ---
ORQ.5 (a) Explain the state space model of a full bridge inverter.
(b) What is feed forward control? Explain the basic working concept and its requirement in a control loop.
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