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 29 of 42

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Q281.
In a 3 phase semiconverter, the output voltage becomes discontinuous for

a.

firing angle > 30°

b.

firing angle > 60°

c.

firing angle > 90°

d.

firing angle > 120°

Discuss
Answer: (b).firing angle > 60°
Q282.
In integral cycle control of ac regulator, the input power factor is equal to

a.

duty cycle ฮฑ

b.

ฮฑ²

c.

โˆšฮฑ

d.

(ฮฑ)^1/3

Discuss
Answer: (c).โˆšฮฑ
Q283.
McMurrary full bridge inverter uses

a.

auxiliary commutation

b.

complementary commutation

c.

natural commutation

d.

any of the above

Discuss
Answer: (a).auxiliary commutation
Q284.
A fully controlled bridge converter feeds a highly inductive load such that the load current can be assumed to be constant. The wave shape of input current is

a.

dc

b.

sinusoidal

c.

rectangular

d.

none of the above

Discuss
Answer: (c).rectangular
Q285.
A static excitation system uses

a.

transformer and thyristors

b.

transformer and ac exciter

c.

dc exciter and ac exciter

d.

transformer and dc exciter

Discuss
Answer: (a).transformer and thyristors
Q286.
The application of gate signal decreases the break over voltage of on SCR.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True
Q287.
The power factor at the input terminals of a cyclo- converter is generally

a.

low and leading

b.

low and lagging

c.

high and leading

d.

high and lagging

Discuss
Answer: (b).low and lagging
Q288.
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
Q289.
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
Q290.
The number of doped regions in a SCR is

a.

2

b.

3

c.

4

d.

5

Discuss
Answer: (c).4
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