EE8552 - Power Electronics - Unit-4 Two marks

Subject Name: Power Electronics

Subject Code: EE8552

B.E. EEE/Mechatronics Dept - semester 05

Anna University Regulation 2017 B.E. EEE/Mechatronics Dept 5th semester EE8552(Power Electronics) 2 marks for 4th unit is provided below. EE8552 all units 2 marks, Power Electronics all units notes & syllabus are listed down for students to utilize it for scoring maximum marks with our study materials.

1.List the four applications of CSI.

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2.What is PWM ? List its various techniques.

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3.Define modulation index of PWM. What is its use ? (or) Define modulation index in pulse width modulation employed in inverter.

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4.List a few industrial applications of inverters. (or) Discuss a few applications for inverters.

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5.What is the purpose of connecting diode in antiparallel with thyristors in inverters ? (or) State the necessity of return current diodes in inverter.

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6.What is the need for voltage control in an inverter ?

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7.What are the modulation techniques used in an inverters ? (or) List different methods of controlling the output voltage of inverters.

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8.Mention any two advantages of current source inverter.

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9.Define the term inverter gain.

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10.What is a current source inverter ?

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11.What are the advantages of PWM inverter ? (or) Why is PWM inverter superior than the square wave inverter ? (or) What are the advantages of PWM control in inverters ?

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12.Mention the difference between sinusoidal PWM and modified sinusoidal PWM techniques.

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13.List the advantages of multiple PWM over single PWM technique.

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14.What are the merits and demerits of current source inverter ?

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15.Why is the series inverter called so ?

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16.What is the maximum value of voltage transfer ratio could be obtained with sinusoidal PWM ?

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17.What are the adverse effects of harmonics ? (or) What are the disadvantages of the harmonics present in the inverter system ?

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18.Write down the advantages of space vector modulation over sinusoidal PWM.

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19.What is space vector ?

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20.What is the advantage of 120° mode of inverter operation over 180° mode ?

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21.What is meant by voltage source inverter ?

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22.Why thyristors are not preferred for inverter ?

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23.What is the function of feedback diodes in bridge inverter ?

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24.What is meant by 'space vector modulation' ?

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25.Distinguish between VSI and CSI. (or) What are the main differences between current driven and voltage driven Inverters ?

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