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 23 of 42

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Q221.
The load circuit of a single phase full bridge inverter

a.

must be underdamped

b.

must be overdamped

c.

may be underdamped or overdamped

d.

may be any type of load

Discuss
Answer: (d).may be any type of load
Q222.
When an SCR is reverse biased

a.

two junctions are reverse biased and one junction is forward biased.

b.

all the three junctions are reverse biased.

c.

one junction is reverse biased and two junctions are forward biased.

d.

any of the above depending on the magnitude of reverse bias.

Discuss
Answer: (a).two junctions are reverse biased and one junction is forward biased.
Q223.
A dc series motor is coupled to a load whose torque is proportional to speed. It is fed by a single phase ac supply through a full converter. When speed is 500 rpm, firing angle is 45°. It is desired to raise the speed. It will be necessary to

a.

decrease the firing angle

b.

increase the firing angle

c.

either decrease or increase the firing angle depending on the required speed

d.

decrease the load torque

Discuss
Answer: (a).decrease the firing angle
Q224.
In Jone chopper, the commutating element

a.

is a capacitor

b.

is a capacitor and an inductor

c.

is a capacitor and an auto transformer

d.

none of the above

Discuss
Answer: (c).is a capacitor and an auto transformer
Q225.
A LASCR has

a.

4 semiconductor layers and 3 junctions

b.

3 semiconductor layers and 2 junctions

c.

2 semiconductor layers and 2 junctions

d.

any of these depending on the rating

Discuss
Answer: (a).4 semiconductor layers and 3 junctions
Q226.
In a modified series inverter

a.

the maximum output frequency is less than frequency of damped oscillations

b.

the output frequency can be even higher than the frequency of damped oscillations

c.

the output frequency cannot exceed the frequency of damped oscillations

d.

any of the above

Discuss
Answer: (b).the output frequency can be even higher than the frequency of damped oscillations
Q227.
Assertion (A): Light triggering is very suitable for HVDC transmission.

Reason (R): Light triggering has the advantage of complete electrical isolation of gate circuit.

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: (a).Both A and R are correct and R is correct explanation of A
Q228.
Which of the following is not between F2 layer and D layer?

a.

E layer

b.

F1 layer

c.

G region

d.

All of the above

Discuss
Answer: (c).G region
Q229.
A cycloconverter can be

a.

step down

b.

step up

c.

step down or step up

d.

none of the above

Discuss
Answer: (c).step down or step up
Q230.
In a 3 phase fully controlled converter the firing frequency is

a.

3 times the line frequency

b.

6 times the line frequency

c.

9 times the line frequency

d.

12 times the line frequency

Discuss
Answer: (b).6 times the line frequency
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