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 6 of 42

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Q51.
A single phase fully controlled bridge converter is feeding an RLE load. Input voltage is Vm sin ωt and firing angle is α. If average current is I₀, then

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q52.
Which of the following is not between F2 layer and D layer?

a.

E layer

b.

F1 layer

c.

G region

d.

All of the above

Discuss
Answer: (c).G region
Q53.
A cycloconverter can be

a.

step down

b.

step up

c.

step down or step up

d.

none of the above

Discuss
Answer: (c).step down or step up
Q54.
In a 3 phase fully controlled converter the firing frequency is

a.

3 times the line frequency

b.

6 times the line frequency

c.

9 times the line frequency

d.

12 times the line frequency

Discuss
Answer: (b).6 times the line frequency
Q55.
Two thyristor of same rating and same specifications

a.

will have equal turn on and turn off periods

b.

will have equal turn on but unequal turn off periods

c.

may have equal or unequal turn on and turn off periods

d.

will have unequal turn on and turn off periods

Discuss
Answer: (c).may have equal or unequal turn on and turn off periods
Q56.
The amount of dielectric heating is inversely proportional to frequency.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q57.
A semiconverter feeding an RLE load operates in

a.

first quadrant only

b.

first and second quadrants

c.

first and fourth quadrants

d.

first and third quadrants

Discuss
Answer: (a).first quadrant only
Q58.
The phenomenon of overlap in converter operation due to

a.

source resistance

b.

source inductance

c.

both source resistance and source inductance

d.

high value of firing angle

Discuss
Answer: (b).source inductance
Q59.
A thyristor has a maximum allowable junction temperature of 120°C and the ambient temperature is 40°C. If thermal resistance is 1.6° C/W, the maximum allowable internal power dissipation is

a.

20 W

b.

50 W

c.

92 W

d.

128 W

Discuss
Answer: (b).50 W
Q60.
For a 12 pulse operation, the two 6 pulse units are fed by

a.

Y - Y and Y - Y transformers

b.

Δ - Δ and Δ - Δ transformers

c.

Y - Y and Y - Δ transformers

d.

Y - Δ and Y - Δ transformers

Discuss
Answer: (c).Y - Y and Y - Δ transformers
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