Power Electronics MCQ Multiple Choice Questions Answers

Q: 1. A crowbar is a circuit which is used to protect a

Correct Answer is: current sensitive load from excessive ac power supply output voltages

Q: 2. A diac has........................terminals

Correct Answer is: None of the above

Q: 3. A diac has....................pn junctions

Correct Answer is: None of the above

Q: 4. A diac has ................... semiconductor layers

Correct Answer is: None of the above

Q: 5. A diac is simply.....................

Correct Answer is: None of the above

Q: 6. A diac is turned on by ...................

Correct Answer is: None of the above

Q: 7. A full wave rectifier with resistive load produces

Correct Answer is: Second harmonic

Q: 8. A triac can pass a portion of ..................... half-cycle through the load

Correct Answer is: None of the above

Q: 10. A Triac has three terminals viz.....................

Correct Answer is: None of the above

Q: 11. A triac is a ................ switch

Correct Answer is: None of the above

Welcome to our Power Electronics MCQs section, designed to help students and exam aspirants master key concepts through practice and revision.

About Power Electronics MCQ Questions

Power Electronics deals with the conversion and control of electric power using semiconductor devices. Our MCQs cover essential topics such as converters, inverters, rectifiers, and motor drives, ensuring a comprehensive understanding of the subject.

Why Practice Power Electronics Objective Questions?

Practicing Power Electronics MCQs helps you prepare for school and college exams, competitive tests, and job interviews. It reinforces your knowledge, improves problem-solving skills, and boosts your confidence in handling complex concepts and real-world applications.

Who Should Use These MCQs?

Power Electronics MCQ Questions for Practice

1. A crowbar is a circuit which is used to protect a

current sensitive load from excessive dc power supply output voltages
voltage sensitive load from excessive ac power supply output voltages
voltage sensitive load from excessive dc power supply output voltages
current sensitive load from excessive ac power supply output voltages

2. A diac has........................terminals

Three
Four
Two
None of the above

3. A diac has....................pn junctions

Two
Three
Four
None of the above

4. A diac has ................... semiconductor layers

Two
Four
Three
None of the above

5. A diac is simply.....................

A three junction device
A triac without gate terminal
A single junction device
None of the above

6. A diac is turned on by ...................

Gate voltage
Gate current
A breakover voltage
None of the above

7. A full wave rectifier with resistive load produces

Third harmonic
Fifth harmonic
Second harmonic
Do not produce harmonics

8. A triac can pass a portion of ..................... half-cycle through the load

Only negative
Both positive and negative
Only positive
None of the above

9. A triac has .................... semiconductor layers

Three
Four
Two
Five

10. A Triac has three terminals viz.....................

Two main terminal and a gate terminal
Cathode, anode, gate
Drain, source, gate
None of the above

11. A triac is a ................ switch

Unidirectional
Mechanical
Bidirectional
None of the above

12. A triac is equivalent to two SCRs .......................

In series
In inverse-parallel
In parallel
None of the above

13. A UJT has ....................

One pn junction
Three pn junctions
Two pn junctions
None of the above

14. A UJT is sometimes called................ diode

High resistance
Single-base
Low resistance
Double-base

15. AC power in a load can be controlled by using

two SCRs in series
three SCRs in series
two SCRs in parallel opposition
four SCRs in series

16. After peak point, the UJT operates in the ................... region

Saturation
Negative resistance
Cut-off
None of the above

17. An SCR can be used

for power control
for speed control of dc shunt motor
as static conductor
all of these

18. An SCR is made up of silicon because

silicon has small leakage current than germanium
silicon has small leakage voltage than germanium
silicon has large leakage current than germanium
silicon has large leakage voltage than germanium

19. Between the incoming and outgoing devices in voltage commutation

Small overlapping operation
No overlapping operation
Large overlapping takes place
None of these

20. Between the peak point and the valley point of UJT emitter characteristics we have ....................... region

Negative resistance
Cut-off
Saturation
None of the above

21. Double fourier series analysis of PWM is

Three dimensional functions
One dimensional functions
Two dimensional functions
All of these

22. During the commutation period in 3 phase converter, overlap time is

Dependent on the voltage
Dependent on both the load current and load voltage behind the short circuit current
Dependent on the load current
Independent on both the load current and load voltage

23. For a buck converter to reduce the conduction losses in diode

A low on - resistance switch can be added in parallel
A high on - resistance switch can be added in series
A high on - resistance switch can be added in parallel
A low on - resistance switch can be added in series

24. For bidirectional operation of converters

A parallel combination of controllable switch and capacitor is used
A series combination of controllable switch and a diode is used
A parallel combination of controllable switch and a diode is used
A series combination of controllable switch and a capacitor is used

25. For similar carrier and modulating signals, the line current used in CSI is

Identical to line current in VSI
Identical to phase voltage in VSI
Identical to line voltage in a VSI
Identical to phase voltage in CSI

26. For sweptfrequency measurements, the input impedance of the mismatched transmission line would vary with frequency as the electrical length ofthe transmission line would

Remains same with change in frequency
Increase with frequency
Decrease with frequency
Either (a or b)

27. Harmonics in 3 phase inverters can be reduced by using

Active filter
Both passive and active filters
Passive filter
None of these

28. In a 3 phaseCSI, if the required line output voltages are balanced and 120 degreeout of phase, then the chopping angles are used to eliminate only theharmonics at frequencies

7
11
5
All of these

29. In a load commutated DC - DC chopper, the capacitor has a

Symmetric rectangular voltage across itself
Symmetric trapezoidal voltage across itself
Symmetric triangular voltage across itself
Symmetric sinusoidal voltage across itself

30. In a three phase converter, the number of notches per cycle is

Three
Six
One
Nine

Power Electronics MCQ Multiple Choice Questions Answers | Quiz for Practice

About Power Electronics MCQ Questions

Why Practice Power Electronics Objective Questions?

Who Should Use These MCQs?

Power Electronics MCQ Questions for Practice

1. A crowbar is a circuit which is used to protect a

2. A diac has........................terminals

3. A diac has....................pn junctions

4. A diac has ................... semiconductor layers

5. A diac is simply.....................

6. A diac is turned on by ...................

7. A full wave rectifier with resistive load produces

8. A triac can pass a portion of ..................... half-cycle through the load

9. A triac has .................... semiconductor layers

10. A Triac has three terminals viz.....................

11. A triac is a ................ switch

12. A triac is equivalent to two SCRs .......................

13. A UJT has ....................

14. A UJT is sometimes called................ diode

15. AC power in a load can be controlled by using

16. After peak point, the UJT operates in the ................... region

17. An SCR can be used

18. An SCR is made up of silicon because

19. Between the incoming and outgoing devices in voltage commutation

20. Between the peak point and the valley point of UJT emitter characteristics we have ....................... region

21. Double fourier series analysis of PWM is

22. During the commutation period in 3 phase converter, overlap time is

23. For a buck converter to reduce the conduction losses in diode

24. For bidirectional operation of converters

25. For similar carrier and modulating signals, the line current used in CSI is

26. For sweptfrequency measurements, the input impedance of the mismatched transmission line would vary with frequency as the electrical length ofthe transmission line would

27. Harmonics in 3 phase inverters can be reduced by using

28. In a 3 phaseCSI, if the required line output voltages are balanced and 120 degreeout of phase, then the chopping angles are used to eliminate only theharmonics at frequencies

29. In a load commutated DC - DC chopper, the capacitor has a

30. In a three phase converter, the number of notches per cycle is

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Power Electronics MCQ Multiple Choice Questions Answers | Quiz for Practice

About Power Electronics MCQ Questions

Why Practice Power Electronics Objective Questions?

Who Should Use These MCQs?

Power Electronics MCQ Questions for Practice

1. A crowbar is a circuit which is used to protect a

2. A diac has........................terminals

3. A diac has....................pn junctions

4. A diac has ................... semiconductor layers

5. A diac is simply.....................

6. A diac is turned on by ...................

7. A full wave rectifier with resistive load produces

8. A triac can pass a portion of ..................... half-cycle through the load

9. A triac has .................... semiconductor layers

10. A Triac has three terminals viz.....................

11. A triac is a ................ switch

12. A triac is equivalent to two SCRs .......................

13. A UJT has ....................

14. A UJT is sometimes called................ diode

15. AC power in a load can be controlled by using

16. After peak point, the UJT operates in the ................... region

17. An SCR can be used

18. An SCR is made up of silicon because

19. Between the incoming and outgoing devices in voltage commutation

20. Between the peak point and the valley point of UJT emitter characteristics we have ....................... region

21. Double fourier series analysis of PWM is

22. During the commutation period in 3 phase converter, overlap time is

23. For a buck converter to reduce the conduction losses in diode

24. For bidirectional operation of converters

25. For similar carrier and modulating signals, the line current used in CSI is

26. For sweptfrequency measurements, the input impedance of the mismatched transmission line would vary with frequency as the electrical length ofthe transmission line would

27. Harmonics in 3 phase inverters can be reduced by using

28. In a 3 phaseCSI, if the required line output voltages are balanced and 120 degreeout of phase, then the chopping angles are used to eliminate only theharmonics at frequencies

29. In a load commutated DC - DC chopper, the capacitor has a

30. In a three phase converter, the number of notches per cycle is

Your Score

Related Quiz Topics

Recent Articles

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