Power Electronics MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Power Electronics, a fundamental topic in the field of Electronics and Communication Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Power Electronics MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Power Electronics mcq questions that explore various aspects of Power Electronics problems. Each MCQ is crafted to challenge your understanding of Power Electronics principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Electronics and Communication Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Power Electronics MCQs are your pathway to success in mastering this essential Electronics and Communication Engineering topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Power Electronics. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Power Electronics knowledge to the test? Let's get started with our carefully curated MCQs!

Power Electronics MCQs | Page 25 of 42

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Q241.
The number of thyristors in a single phase fully controlled bridge rectifier is

a.

16

b.

8

c.

4

d.

2

Discuss
Answer: (c).4
Q242.
In a bridge inverter

a.

an output transformer is essential

b.

an output transformer is not essential

c.

an output transformer cannot be connected

d.

an output transformer, if used, can improve the efficiency of the circuit

Discuss
Answer: (b).an output transformer is not essential
Q243.
An ideal rectifier should have

a.

100% efficiency, zero ripple factor, zero harmonic factor and unity displacement factor

b.

100% efficiency, zero tipple factor, zero harmonic factor and zero displacement factor

c.

100% efficiency, zero ripple factor, unity harmonic factor and unity displacement factor

d.

100% efficiency, unity ripple factor, zero harmonic factor and unity displacement factor

Discuss
Answer: (a).100% efficiency, zero ripple factor, zero harmonic factor and unity displacement factor
Q244.
When thyristors are connected in parallel, the current distribution may become non-uniform due to

a.

inductive effect of current carrying conductors

b.

capacitive effect of current carrying conductors

c.

both inductive and capacitive effects

d.

none of the above

Discuss
Answer: (a).inductive effect of current carrying conductors
Q245.
As compared to a p-n junction diode

a.

a schottky diode has lower cut in voltage and lower reverse saturation current

b.

a schottky diode has higher cut in voltage and higher reverse saturation current

c.

a Schottky diode has lower cut in voltage and higher reverse saturation current

d.

a schottky diode has higher cut in voltage and lower reverse saturation current

Discuss
Answer: (c).a Schottky diode has lower cut in voltage and higher reverse saturation current
Q246.
From which instant is the turn off time of a thyristor defined

a.

when anode voltage becomes zero

b.

when anode current becomes zero

c.

when both anode voltage and current become zero

d.

none of the above

Discuss
Answer: (b).when anode current becomes zero
Q247.
In a single phase cycloconverter with centre tapped transformer

a.

all thyristors carry currents for equal duration

b.

the durations of currents in all thyristors may or may not be equal

c.

the durations of currents in all thyristors cannot be equal

d.

the duration of currents in all thyristors must be equal for satisfactory operation

Discuss
Answer: (b).the durations of currents in all thyristors may or may not be equal
Q248.
Assertion (A): Power transistor has lower switching time than SCR

Reason (R): Power transistor has greater switching time than SCR

a.

Both A and R are correct and R is correct explanation of A

b.

Both A and R correct but R is not correct explanation of A

c.

A is correct but R is wrong

d.

A is wrong but R is correct

Discuss
Answer: (d).A is wrong but R is correct
Q249.
A 3 kV circuit uses SCR of 800 V rating. If derating is 25%, the number of SCRs in series is

a.

4

b.

5

c.

6

d.

8

Discuss
Answer: (b).5
Q250.
The number of doped regions in a SCR is

a.

2

b.

3

c.

4

d.

5

Discuss
Answer: (c).4
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