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 8 of 42

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Q71.
An SCR is triggered at 40° in the positive half cycle only. The average anode current is 50 A. If the firing angle is changed to 80°, the average anode current is likely to be

a.

50 A

b.

25 A

c.

less than 50 A but more than 25 A

d.

less than 25 A

Discuss
Answer: (c).less than 50 A but more than 25 A
Q72.
The characteristics of a non-linear resistance is i = kv⁴. If i becomes 100 times, v becomes

a.

about 100 times

b.

about 10 times

c.

about 3 times

d.

about twice

Discuss
Answer: (c).about 3 times
Q73.
In a step down chopper using pulse width modulation, Ton = 3 x 10¯³ and Toff = 1 x 10¯³ s. The chopping frequency is

a.

333.33

b.

250

c.

500

d.

1000

Discuss
Answer: (b).250
Q74.
Thyristors are suitable for dc circuit breakers but not for ac circuit breakers.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q75.
Assertion (A): Inverters and choppers use fast switching thyristors

Reason (R): Fast switching SCR has low turn off 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: (a).Both A and R are correct and R is correct explanation of A
Q76.
The number of leads in an SCR are :

a.

2

b.

3

c.

4

d.

5

Discuss
Answer: (b).3
Q77.
A thyristor has a turn on time of 6 μs. If the anode circuit is inductive, the turn on time will be

a.

6 μs

b.

less than 6μs

c.

more than 6 μs

d.

either 6 μs or less

Discuss
Answer: (c).more than 6 μs
Q78.
The total number of leads in reverse conducting thyristor is

a.

2

b.

3

c.

1

d.

4

Discuss
Answer: (b).3
Q79.
Assertion (A): A TRIAC is a bidirectional SCR.

Reason (R): A TRIAC is a four layers 3 terminal device and can conduct in both directions.

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
Q80.
The value of capacitor C for dynamic equalising circuit of series connected thyristors is determined by

a.

forward characteristics of thyristors

b.

reverse recovery characteristics of thyristors

c.

both forward and reverse recovery characteristics of thyristors

d.

none of the above

Discuss
Answer: (b).reverse recovery characteristics of thyristors
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