EE8552 - Power Electronics - Unit-1 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 1st 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.Define softness factor of a power diode.

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2.What are the advantages of GTO over BJT ?

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3.Define : Holding current of an SCR.

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4.What is reverse recovery time ?

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5.Mention any two advantages of GTO over SCR.

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6.What are the factors that influence the reverse recovery current of a power diode ?

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7.Why MOSFETs are not preferred for low frequency applications?

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8.Why are IGBT becoming popular in their application to controlled converters ? (or) Specify the basic features of IGBT.

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9.What are the factors that influence the turn-off time of a thyristor ?

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10.In Triacs which of the modes the sensitivity of gate is high ?

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11.What are the basic requirements for successful firing of the thyristor?

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12.Define the term pinch-off voltage of MOSFET.

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13.What are the advantages of MOSFET over BJT ? (or) What are the main advantages of MOSFET in swtiching applications.

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14.What is latching current of SCR ?

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15.State the advantages of IGBT over MOSFET.

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16.How SCR differs from TRIAC ?

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17.What are the parameters involved in switching loss of a power device ?

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18.What are the methods to turn-on the SCR?

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19.State the condition to be satisfied for the load commutation in SCR.

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20.Define ‘Turn off time’ of SCR.

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21.What do you mean by load commutation ?

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22.What do you mean by controlled switch ?

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23.What is the need of driver circuit ?

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24.What are the drawbacks of GTO ?

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25.What is the limitation of high frequency operation of a power electronic device ?

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26.List the various forced commutation techniques used to turn off SCR.

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27.What is meant by current commutation in SCR ?

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28.What is meant by commutation of SCR and list its types?

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29.What Triac is not popular as compared to SCR ? Justify.

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30.Mention the advantages of 'RC' triggering over 'R' triggering.

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31.What is fast recovery diode ? Mention its uses.

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32.Distinguish between holding current and latching current of SCR.

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33.Why is pulse triggering preferred over RC triggering ?

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