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 37 of 42

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Q361.
Assertion (A): A fully controlled bridge converter can operate in first and fourth quadrant.

Reason (R): A semi converter is cheaper than a full converter.

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: (b).Both A and R correct but R is not correct explanation of A
Q362.
A fully controlled bridge converter is feeding an RLE load. The load current is I0. The input voltage is Vm sin ฯ‰t. The KVL equation to find firing angle a is

a.

cos a = E + I0R

b.

cos a = E + I0R

c.

cos a = E - I0R

d.

cos a = E - I0R

Discuss
Answer: (b).cos a = E + I0R
Q363.
A single phase cycloconverter with centre tapped input transformer requires

a.

2 thyristors

b.

4 thyristors

c.

8 thyristors

d.

either 2 or 4 thyristors

Discuss
Answer: (b).4 thyristors
Q364.
In a 3 phase bridge inverter with 120° mode of operation the. number of thyristors conducting at one time are

a.

1

b.

2

c.

3

d.

4

Discuss
Answer: (b).2
Q365.
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
Q366.
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
Q367.
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
Q368.
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
Q369.
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
Q370.
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
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