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 9 of 42

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Q81.
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
Q82.
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
Q83.
The number of doped regions in a SCR is

a.

2

b.

3

c.

4

d.

5

Discuss
Answer: (c).4
Q84.
All inverters use forced commutation.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q85.
In 180° mode of operation of a 3 phase bridge inverter, two thyristors conduct at one time.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q86.
In a single phase full wave ac regulator the rms value of load current is 20 A load is purely resistive. Then

a.

average thyristor current will be less than 20 A but rms thyristor current will be more than 20 A

b.

both the average and rms thyristor currents will be less than 20 A

c.

both the average and rms thyristor currents will be more than 20 A

d.

rms thyristor current will be 20 A and average thyristor current will be 10 A

Discuss
Answer: (b).both the average and rms thyristor currents will be less than 20 A
Q87.
A reactor is used in a dual converter operating in non-circulating current mode.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q88.
In a 3 phase full wave regulator feeding resistance load connected in star, the possible range of firing angle ฮฑ is

a.

0 โ‰ค ฮฑ โ‰ค 180°

b.

0 โ‰ค ฮฑ โ‰ค 150°

c.

0 โ‰ค ฮฑ โ‰ค 120°

d.

0 โ‰ค ฮฑ โ‰ค 90°

Discuss
Answer: (b).0 โ‰ค ฮฑ โ‰ค 150°
Q89.
Assertion (A): A dual converter may be circulating current type or non circulating current type.

Reason (R): In circulating current dual converter only one converter can be operated at one time.

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: (c).A is correct but R is wrong
Q90.
Current chopping leads to

a.

over voltage

b.

over current

c.

both over voltage and over current

d.

either over voltage or over current

Discuss
Answer: (a).over voltage
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