EE2301 POWER ELECTRONICS QUESTION BANK PDF

What are the different methods to turn on the thyristor? Define latching current. What is a snubber circuit? Why IGBT is very popular nowadays?

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What are the different methods to turn on the thyristor? Define latching current. What is a snubber circuit? Why IGBT is very popular nowadays? What is the difference between power diode and signal diode? What is Thyristor? Mention some of them. What losses occur in a thyristor during working conditions? IGBT is a voltage controlled device. Power BJT is a current controlled device. How can a thyristor turned off?

Define circuit turn off time. Why circuit turn off time should be greater than the thyristor turn-off time? What are the classifications of Power semiconductor devices? Define Hard-firing or over driving. Define forward Break over Voltage. Define Reverse Break over voltage. What is forced commutation?

What is meant by Secondary breakdown? Distinguish between holding current and latching current of SCR. What is commutation? What are the two main types of commutation? Draw the V-I characteristics of SCR and mark the holding current and latching current in the characteristics. What are the classification of power Diodes?

What is reverse recovery time of Diodes? Define Spread Time. What is the turn-off time for converter and inverter grade SCRs? PART-B 1. Draw the two transistor model of SCR and derive an expression for anode current. Explain the Construction, principle of operation and static characteristics of SCR 3. Describe the various methods of thyristor turn on.

Explin detail in Construction of BJT and that characteristics. Explin detail in GTO. What are the types of special semiconductor devices? And Explain in detail. Explain the switching performance of BJT with relevant waveforms indicating clearly the turn-on, turn off times and their components. Describe turn on characteristics of IGBT with neat waveforms. What are the two types of commutation? Sketch the transfer and switching characteristics of IGBT. What is meant by phase controlled rectifier?

What is the function of freewheeling diodes in controlled rectifier? What are the advantages of freewheeling diodes in a controlled in a controlled rectifier? What is meant by delay angle? What are the advantages of single phase bridge converter over single phase mid-point converter? What is commutation angle or overlap angle? What are the different methods of firing circuits for line commutated converter? Give an expression for average voltage of single phase semiconverters. What is meant by input power factor in controlled rectifier?

What are the advantages of six pulse converter? What are the general classification of rectifier circuits? What is meant by uncontrolled rectifier? What are the different types of controlled rectifier? What is meant by half controlled rectifier? List various applications of controlled converters? What are the two configuration of single phase two pulse controlled rectifier? Give an expression for average output voltage of single phase full converter. What is the inversion mode of rectifiers?

What are the performance factors of line-commutated converters? Define voltage ripple factor? When does the line commutated converter act as a line commutated inverter? How is power factor of semi converter better then that of full converter? Draw the half controlled single phase converter circuit. Assume resistance load. Define harmonic factor or THD of the input current.

Define displacement factor. What is three phase controlled rectifier? What are the advantages of three phase controlled rectifier? What are the classifications of three phase controlled rectifier? Write down the expression for average output voltage of three phase half controlled rectifier?

Write down the expression for average output voltage of three phase full converter? What are the effects of source impedance in the controlled rectifiers? What is meant by continuous current operation of thyristor converter?

Discuss operation of a single phase full wave controlled rectifier feeding RL load. What is the effect of adding a freewheeling diode on the performance of the converter. Describe the working of 1 ф fully controlled bridge converter in the Rectifying mode and inversion mode. And derive the expressions for average output voltage and rms output voltage.

Describe the principle of operation of two pulse midpoint converter with resistive load and also derive the average load voltage. Explain the operation of full wave mid point converter with RL load. With neat sketch, describe the function of single phase half controlled bridge rectifier with resistive load.

With neat sketch, describe the function of single phase half controlled bridge rectifier with resistive load and inductive load. Derive the expressions for average output voltage and rms output voltage of 1 ф semi converter.

With neat sketch, describe the function of single phase half controlled bridge rectifier with RLE load free-wheeling load. Describe the operation three phase half wave controlled rectifier with resistive load with continuous and discontinuous mode of operation. Describe the operation and waveform of three phase half wave controlled rectifier with RL load.

Describe the operation and waveform of three phase half controlled Bridge rectifier. Describe the working of 3 ф fully controlled bridge converter in the Rectifying mode and inversion mode.

Describe the working of Dual converter. Explain the effect of source inductance on the performance of single phase fully controlled converter. A single phase semi converter is operated from V 50Hz ac supply.

Describe the effect of source inductance on the performance of a single phase full converter indicating clearly the conduction of various thyristors during one cycle.

Derive the expression for its output voltage. What is meant by dc chopper? What are the applications of dc chopper? What is meant by step-up and step-down chopper? Write down the expression for average output voltage for step down chopper. Write down the expression for average output voltage for step up chopper. What is meant by duty-cycle? What are the two types of control strategies?

What is meant by TRC?

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Mulrajas About EEEcube provides you access to several study resources that help you to excel in your Electrical and Electronics Engineering course. Newer Posts Older Posts Home. Mention its advantages and disadvantages. It is managed by Balaji MC Admin. Remote controlled fan regulator. Describe the following systems in wlectronics with ee Diesel Power Plant. Motor bike theft alarm.

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Unit 1 1. Draw the switching characteristics of SCR and explain it. With the help of neat diagram explain the operation of BJT. Find the new value of average load current assuming the output current as continuous.

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