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 40 of 42

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Q391.
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.
Q392.
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
Q393.
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
Q394.
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
Q395.
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
Q396.
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
Q397.
Class A and class B chopper

a.

operate in first quadrant

b.

operate in second quadrant

c.

class A chopper operates in first quadrant while class B operates in second quadrant

d.

may operate in either first or second quadrant

Discuss
Answer: (c).class A chopper operates in first quadrant while class B operates in second quadrant
Q398.
To turn off an SCR, it is necessary to reduce its current to less than :

a.

trigger current

b.

holding current

c.

breakover current

d.

none of the above

Discuss
Answer: (b).holding current
Q399.
When a single phase dual converter is operating in circulating current mode

a.

both converters are working as rectifiers simultaneously

b.

one converter is always working as rectifier and the other as inverter

c.

only one converter is working at one time

d.

both converters are either working as rectifiers or as inverters simultaneously

Discuss
Answer: (b).one converter is always working as rectifier and the other as inverter
Q400.
In a 3 phase bridge inverter, the gating signals for the three phases have a phase difference of

a.

120°

b.

60°

c.

240°

d.

any of the above

Discuss
Answer: (a).120°
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