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.
The rated current of a thyristor is 40 A. The holding current will be about :

a.

20 A

b.

1 A

c.

100 mA

d.

10 mA

Discuss
Answer: (d).10 mA
Q82.
A cycloconverter is

a.

ac-dc converter

b.

dc-ac converter

c.

dc-dc converter

d.

ac-ac converter

Discuss
Answer: (d).ac-ac converter
Q83.
The number of leads in a power semiconductor diode are

a.

2

b.

3

c.

4

d.

2 or 3

Discuss
Answer: (a).2
Q84.
If ton and toff are the turn on and turn off times of a thyristor, then

a.

ton and toff are almost equal

b.

ton >> toff

c.

toff >> ton

d.

ton is about twice toff

Discuss
Answer: (c).toff >> ton
Q85.
Assertion (A): The gate current of an SCR is always in the form of pulses.

Reason (R): The gate losses, in pulse triggering, are low.

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
Q86.
The average load current supplied by a thyristor depends on

a.

firing angle

b.

firing frequency

c.

magnitude of gate current

d.

all of the above

Discuss
Answer: (a).firing angle
Q87.
In a 3 phase full wave regulator feeding a star connected resistance load the input voltage is 400 V line to line. The firing angle is 160°. The line to line output voltage would be

a.

400 V

b.

about 100 V

c.

about 20 V

d.

zero

Discuss
Answer: (d).zero
Q88.
A thyristor is reverse biased. A positive gate pulse is applied. The thyristor

a.

will be turned on

b.

may or may not turn on

c.

will not turn on

d.

will turn on after sometime

Discuss
Answer: (c).will not turn on
Q89.
A single phase series converter is used for

a.

high voltage output

b.

high current output

c.

high voltage and high current output

d.

improving the circuit efficiency

Discuss
Answer: (a).high voltage output
Q90.
Which of these commutation methods uses an auxiliary SCR?

a.

Class A

b.

Class B

c.

Class C

d.

Class D

Discuss
Answer: (c).Class C
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