50 Top Power Electronics Interview Questions And Answers Pdf Power Electronics Interview Questions.pdf 1g3bg
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50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
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POWER ELECTRONICS Interview Questions and Answers :1. What is holding current in SCR? It is the minimum current required to hold the SCR in forward conduction state. http://engineeringinterviewquestions.com/power-electronics-interview-questions-answers-pdf/
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50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
When the forward current becomes less than holding current, SCR turns from forward conduction state to forward blocking state. 2. What is latching current in SCR? It is the minimum current required to latch(turn on) the SCR from forward blocking state to forward conduction state. 3. What are the different turn on methods of SCR? Forward voltage triggering Gate Triggering dv/dt triggering Temperature triggering Light triggering 4. What is snubber circuit? The snubber circuit is used for the dv/dt protection of the SCR. It is a series combination of a resistor and a capacitor in parallel with the SCR. 5. What is hard switching of the thyristor? When gate current is several times higher than the required gate current, the SCR is said to be hard fired. It reduces the turn ON time and enhances the di/dt capability. 6. What is firing angle? The angle between the zero crossing of the input voltage and the instant the SCR is fired is called as delay angle or firing angle.
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7. What is meant by SOA? SOA – Safe Operating Area determines the voltage and current boundary within which the Power Device can be operated without destructive failure. http://engineeringinterviewquestions.com/power-electronics-interview-questions-answers-pdf/
2/10
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50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
8. What are the main components used for isolating the Power Circuits, Power Semiconductor from the low-power circuit? Opto-Couplers, Transformers 9. Name some of the current controlled (current driven) devices… SCR, GTO, GTR 10. Name some of the voltage driven ( Voltage controlled) devices IGBT, MCT, IGCT, SIT 11. What is duty cycle? It is the ratio of the ON time of the chopper to total time period of the chopper. D = Ton / [Ton + Toff] 12. Can fuses with an AC voltage rating be used in a DC applications? Fuses must be rated for the voltage AC or DC in which they will be used. Generally, fuses have a DC voltage rating that is half of the maximum AC voltage rating. 13. What are the characteristics of ideal Opamp? Infinite open loop voltage gain Infinite input impedance Zero output impedance Infinite Bandwidth Zero offset voltage 14. For High voltage applications will you prefer MOSFET or IGBT? For High voltage applications we have to use IGBT. Because MOSFETs are low voltage devices. ie, Their http://engineeringinterviewquestions.com/power-electronics-interview-questions-answers-pdf/
3/10
1/2/2017
50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
voltage rating is lesser than IGBT. General rule is MOSFETs are suitable for applications which has breakdown voltage less than 250V. The IGBTs are suitable for applications which has breakdown voltage upto 1000V. 15. For High frequency applications will you prefer MOSFET or IGBT? Why? For High frequency applications, MOSFET is the right choice of the device. Because MOSFET has low switching losses compare to that of IGBT. General rule of thumb is for low-frequency applications having frequency range upto 20kHz, we have to use IGBT. For high frequency applications having frequency range of more than 200kHz, we have to use MOSFET.
POWER ELECTRONICS Interview Questions and Answers pdf :: 16. What are the advantages of free wheeling diode in rectifier circuit? The input power factor is improved. It prevents the output voltage from becoming negative. The Load current waveform is improved. [Q] What is meant by commutation? The process of changing the direction of current flow in a particular path of the circuit. It is used to turn off the SCR. 17. What are the types of commutation? Natural commutation Forced commutation 18. What is natural commutation? The process of the current flowing through the thyristor http://engineeringinterviewquestions.com/power-electronics-interview-questions-answers-pdf/
4/10
1/2/2017
50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
goes through a natural zero and enable the thyristor to turn off is called as natural commutation. 19. What is forced commutation? The process of the current flowing through the thyristor is forced to become zero by external circuitry is called as forced commutation. 20. What are the types of commutation with respect to commutation process? Voltage commutated chopper Current commutated chopper Load commutated chopper 21. What is meant by cyclo-converter? It is also known as frequency changer. It converts input power at one frequency to output power at another frequency with one stage conversion. 22. What are the types of cyclo-converters? Step up cyclo-converter Step down cyclo-converter. 23. What is step down cyclo-converter? It is the converter whose output frequency is less than the input frequency. 24. What is step up cyclo-converter ? It is the converter whose output frequency is more than the input frequency. 25. What does the Voltmeter in AC mode show? Is it RMS value or peak value? Multimeter in AC mode shows RMS value of the voltage or current. Also when it is DC mode it will show the RMS http://engineeringinterviewquestions.com/power-electronics-interview-questions-answers-pdf/
5/10
1/2/2017
50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
value only. 26. What is the necessity to use the special machines? General purpose motors (Induction motors, synchronous motors) are neither precision speed nor precision position motors. For many automated systems require high precise speed and high precise positioning motors. In such cases special purpose motors like stepper motors, PMDC motors etc. are used. 27. What are the control strategies of chopper? The control strategies of chopper are 1. Pulse width modulation PWM (Variable TON, Constant frequency) 2. Frequency modulation (Constant TON or TOFF, Variable frequency) 3. Current Limit Control (CLC) 28. What is delay angle or what is firing angle of phase controlled rectifier? The delay angle is the angle at which thyristors are triggered after zero crossing. After zero crossing of supply voltage, one pair of thyristors is forward biased. ie, After delay angle(α) these SCRs are triggered. 29. What is Universal Motor? It is defined as a motor which can be operated either on DC or single-phase AC supply at approximately the same speed and output. The universal motor is built exactly like a series DC motor. But a series DC motor cannot be run as a universal motor, even though both motors look the same internally and externally. We cannot use these motors in the industrial applications http://engineeringinterviewquestions.com/power-electronics-interview-questions-answers-pdf/
6/10
1/2/2017
50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
due to the low efficiency (25% -35%). It has high starting torque and a variable speed characteristic. It runs at dangerously high-speed on no load. 31. Give some examples of power electronics applications in the day-to-day life? We can list a huge number of power electronics applications. Few of the applications which we can see in our daily life are UPS – Uninterruptible Power Supply SMPS – Switch Mode Power Supply Speed Control of Motors ICU 32. What is meant by PMDC? PMDC stands for Permanent Magnet DC Motor A Permanent Magnet DC Motor is similar to an ordinary dc shunt motor except that its field is provided by permanent magnets instead of salient-pole wound field structure. There are three types of permanent magnets used for such motors namely; (i) Alnico Magnets (ii) Ceramic magnets (iii) Rare-earth magnets The major advantages are low noise, small size, highefficiency, low manufacturing cost.
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50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
Interview Questions and Answers
← Draw the hierarchical classification of the computer
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6 THOUGHTS ON “50 TOP POWER ELECTRONICS INTERVIEW QUESTIONS AND ANSWERS PDF” jeet DECEMBER 2 5, 2 01 6 AT 2 :57 AM
sir pls mail basic electronic interview question answers pdf REPLY
SVSR NOVEMBER 1 8, 2 01 6 AT 5:2 6 PM
Sir will you please send the objective type questions and answers PDF to me Thanking you REPLY
p.s.v.sairam(SVSR) NOVEMBER 1 9, 2 01 6 AT 4:08 PM
Sir Will you please mail the objective Type questions and answers PDF to me Requesting you Thanks…….
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50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
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yamini SEPTEMBER 1 7 , 2 01 6 AT 4:3 9 PM
Sir can uu please mail question and answers pdfpdf to me REPLY
pradip kumar AUGUST 2 , 2 01 6 AT 6:01 PM
sir can u mail please basic electronic question and answers REPLY
Adeel MAY 2 0, 2 01 6 AT 1 0:49 AM
Hi Sir, Can u please mail question & answers pdf file to me . Thank you ! REPLY
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50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
Engineering Interview Questions.com Engineering interview questions,multiple choice questions,objective type questions,seminor topics,lab viva questions and answers ,online quiz test pdf free for freshers. HOME interview Questions MCQs *LAB VIVA CLASS NOTES SEMINAR TOPICS ONLINE TEST GATE IIT JEE CAT
Home » POWER ELECTRONICS Interview Questions » 50 TOP POWER ELECTRONICS Interview Questions and Answers pdf
50 TOP POWER ELECTRONICS Interview Questions and Answers pdf Start Get PDF-Convert.co and convert documents to PDF. It's Free! Go to pdf-convert.co/free
Posted on April 3, 2016 by engineer Comments
Search
-90%
-56%
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-56%
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₹49 B UY N O W -95%
-56%
-90%
-90%
-50%
-50%
-56%
-95%
6
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Interview Questions PDF Book PDF
POWER ELECTRONICS Interview Questions and Answers :1. What is holding current in SCR? It is the minimum current required to hold the SCR in forward conduction state. http://engineeringinterviewquestions.com/power-electronics-interview-questions-answers-pdf/
1/10
1/2/2017
50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
When the forward current becomes less than holding current, SCR turns from forward conduction state to forward blocking state. 2. What is latching current in SCR? It is the minimum current required to latch(turn on) the SCR from forward blocking state to forward conduction state. 3. What are the different turn on methods of SCR? Forward voltage triggering Gate Triggering dv/dt triggering Temperature triggering Light triggering 4. What is snubber circuit? The snubber circuit is used for the dv/dt protection of the SCR. It is a series combination of a resistor and a capacitor in parallel with the SCR. 5. What is hard switching of the thyristor? When gate current is several times higher than the required gate current, the SCR is said to be hard fired. It reduces the turn ON time and enhances the di/dt capability. 6. What is firing angle? The angle between the zero crossing of the input voltage and the instant the SCR is fired is called as delay angle or firing angle.
Engineering Questions
Find us on Google Plus
Engineering inter Follow 414 followers
7. What is meant by SOA? SOA – Safe Operating Area determines the voltage and current boundary within which the Power Device can be operated without destructive failure. http://engineeringinterviewquestions.com/power-electronics-interview-questions-answers-pdf/
2/10
1/2/2017
50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
8. What are the main components used for isolating the Power Circuits, Power Semiconductor from the low-power circuit? Opto-Couplers, Transformers 9. Name some of the current controlled (current driven) devices… SCR, GTO, GTR 10. Name some of the voltage driven ( Voltage controlled) devices IGBT, MCT, IGCT, SIT 11. What is duty cycle? It is the ratio of the ON time of the chopper to total time period of the chopper. D = Ton / [Ton + Toff] 12. Can fuses with an AC voltage rating be used in a DC applications? Fuses must be rated for the voltage AC or DC in which they will be used. Generally, fuses have a DC voltage rating that is half of the maximum AC voltage rating. 13. What are the characteristics of ideal Opamp? Infinite open loop voltage gain Infinite input impedance Zero output impedance Infinite Bandwidth Zero offset voltage 14. For High voltage applications will you prefer MOSFET or IGBT? For High voltage applications we have to use IGBT. Because MOSFETs are low voltage devices. ie, Their http://engineeringinterviewquestions.com/power-electronics-interview-questions-answers-pdf/
3/10
1/2/2017
50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
voltage rating is lesser than IGBT. General rule is MOSFETs are suitable for applications which has breakdown voltage less than 250V. The IGBTs are suitable for applications which has breakdown voltage upto 1000V. 15. For High frequency applications will you prefer MOSFET or IGBT? Why? For High frequency applications, MOSFET is the right choice of the device. Because MOSFET has low switching losses compare to that of IGBT. General rule of thumb is for low-frequency applications having frequency range upto 20kHz, we have to use IGBT. For high frequency applications having frequency range of more than 200kHz, we have to use MOSFET.
POWER ELECTRONICS Interview Questions and Answers pdf :: 16. What are the advantages of free wheeling diode in rectifier circuit? The input power factor is improved. It prevents the output voltage from becoming negative. The Load current waveform is improved. [Q] What is meant by commutation? The process of changing the direction of current flow in a particular path of the circuit. It is used to turn off the SCR. 17. What are the types of commutation? Natural commutation Forced commutation 18. What is natural commutation? The process of the current flowing through the thyristor http://engineeringinterviewquestions.com/power-electronics-interview-questions-answers-pdf/
4/10
1/2/2017
50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
goes through a natural zero and enable the thyristor to turn off is called as natural commutation. 19. What is forced commutation? The process of the current flowing through the thyristor is forced to become zero by external circuitry is called as forced commutation. 20. What are the types of commutation with respect to commutation process? Voltage commutated chopper Current commutated chopper Load commutated chopper 21. What is meant by cyclo-converter? It is also known as frequency changer. It converts input power at one frequency to output power at another frequency with one stage conversion. 22. What are the types of cyclo-converters? Step up cyclo-converter Step down cyclo-converter. 23. What is step down cyclo-converter? It is the converter whose output frequency is less than the input frequency. 24. What is step up cyclo-converter ? It is the converter whose output frequency is more than the input frequency. 25. What does the Voltmeter in AC mode show? Is it RMS value or peak value? Multimeter in AC mode shows RMS value of the voltage or current. Also when it is DC mode it will show the RMS http://engineeringinterviewquestions.com/power-electronics-interview-questions-answers-pdf/
5/10
1/2/2017
50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
value only. 26. What is the necessity to use the special machines? General purpose motors (Induction motors, synchronous motors) are neither precision speed nor precision position motors. For many automated systems require high precise speed and high precise positioning motors. In such cases special purpose motors like stepper motors, PMDC motors etc. are used. 27. What are the control strategies of chopper? The control strategies of chopper are 1. Pulse width modulation PWM (Variable TON, Constant frequency) 2. Frequency modulation (Constant TON or TOFF, Variable frequency) 3. Current Limit Control (CLC) 28. What is delay angle or what is firing angle of phase controlled rectifier? The delay angle is the angle at which thyristors are triggered after zero crossing. After zero crossing of supply voltage, one pair of thyristors is forward biased. ie, After delay angle(α) these SCRs are triggered. 29. What is Universal Motor? It is defined as a motor which can be operated either on DC or single-phase AC supply at approximately the same speed and output. The universal motor is built exactly like a series DC motor. But a series DC motor cannot be run as a universal motor, even though both motors look the same internally and externally. We cannot use these motors in the industrial applications http://engineeringinterviewquestions.com/power-electronics-interview-questions-answers-pdf/
6/10
1/2/2017
50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
due to the low efficiency (25% -35%). It has high starting torque and a variable speed characteristic. It runs at dangerously high-speed on no load. 31. Give some examples of power electronics applications in the day-to-day life? We can list a huge number of power electronics applications. Few of the applications which we can see in our daily life are UPS – Uninterruptible Power Supply SMPS – Switch Mode Power Supply Speed Control of Motors ICU 32. What is meant by PMDC? PMDC stands for Permanent Magnet DC Motor A Permanent Magnet DC Motor is similar to an ordinary dc shunt motor except that its field is provided by permanent magnets instead of salient-pole wound field structure. There are three types of permanent magnets used for such motors namely; (i) Alnico Magnets (ii) Ceramic magnets (iii) Rare-earth magnets The major advantages are low noise, small size, highefficiency, low manufacturing cost.
POWER ELECTRONICS Interview Questions and Answers pdf free ::
Free
unzipper.com
Posted in POWER ELECTRONICS Interview Questions Tagged 100 TOP POWER ELECTRONICS http://engineeringinterviewquestions.com/power-electronics-interview-questions-answers-pdf/
7/10
1/2/2017
50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
Interview Questions and Answers
← Draw the hierarchical classification of the computer
100 TOP MATERIALS and COMPONENTS Questions and Answers pdf →
6 THOUGHTS ON “50 TOP POWER ELECTRONICS INTERVIEW QUESTIONS AND ANSWERS PDF” jeet DECEMBER 2 5, 2 01 6 AT 2 :57 AM
sir pls mail basic electronic interview question answers pdf REPLY
SVSR NOVEMBER 1 8, 2 01 6 AT 5:2 6 PM
Sir will you please send the objective type questions and answers PDF to me Thanking you REPLY
p.s.v.sairam(SVSR) NOVEMBER 1 9, 2 01 6 AT 4:08 PM
Sir Will you please mail the objective Type questions and answers PDF to me Requesting you Thanks…….
http://engineeringinterviewquestions.com/power-electronics-interview-questions-answers-pdf/
8/10
1/2/2017
50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
REPLY
yamini SEPTEMBER 1 7 , 2 01 6 AT 4:3 9 PM
Sir can uu please mail question and answers pdfpdf to me REPLY
pradip kumar AUGUST 2 , 2 01 6 AT 6:01 PM
sir can u mail please basic electronic question and answers REPLY
Adeel MAY 2 0, 2 01 6 AT 1 0:49 AM
Hi Sir, Can u please mail question & answers pdf file to me . Thank you ! REPLY
LEAVE A REPLY Your email address will not be published. Required fields are marked *
Comment
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1/2/2017
50 TOP POWER ELECTRONICS Interview Questions and Answers pdf POWER ELECTRONICS Interview Questions
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Engineering interview questions,multiple choice questions,objective type questions,seminor topics,lab viva questions and answers ,online quiz test pdf free for freshers. & Conditions | | us |
http://engineeringinterviewquestions.com/power-electronics-interview-questions-answers-pdf/
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