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 36 of 42

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Q351.
A class A chopper has an input voltage of 200 V. Ton = 1.5 ms and Toff = 4.5 ms. The duty cycle, average output voltage and ripple factor respectively are

a.

0.5, 100 V and 1

b.

0.25, 50 V and โˆš3

c.

0.25, 50 V and 1

d.

0.5, 100 V and โˆš3

Discuss
Answer: (b).0.25, 50 V and โˆš3
Q352.
A TRIAC can be turned on :

a.

by applying a positive signal to gate

b.

by applying a negative signal to gate

c.

by applying either positive or negative signal to gate

d.

none of the above

Discuss
Answer: (c).by applying either positive or negative signal to gate
Q353.
In a half bridge inverter the gate pulses of the two thyristors have a phase displacement of

a.

60°

b.

90°

c.

120°

d.

180°

Discuss
Answer: (d).180°
Q354.
A fully controlled bridge converter can operate in quadrants

a.

1

b.

1 and 2

c.

1 and 3

d.

1 and 4

Discuss
Answer: (d).1 and 4
Q355.
A class E chopper

a.

can operate in second quadrant only

b.

can operate in first or third quadrant

c.

can operate in all the four quadrants

d.

can operate in either second or third quadrant

Discuss
Answer: (c).can operate in all the four quadrants
Q356.
A cycloconverter uses

a.

natural commutation

b.

forced commutation

c.

either natural or forced commutation

d.

both natural and forced commutation together

Discuss
Answer: (c).either natural or forced commutation
Q357.
Assertion (A): A fully controlled bridge converter can operate in first and fourth quadrant.

Reason (R): A semi converter is cheaper than a full converter.

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: (b).Both A and R correct but R is not correct explanation of A
Q358.
A fully controlled bridge converter is feeding an RLE load. The load current is I0. The input voltage is Vm sin ฯ‰t. The KVL equation to find firing angle a is

a.

cos a = E + I0R

b.

cos a = E + I0R

c.

cos a = E - I0R

d.

cos a = E - I0R

Discuss
Answer: (b).cos a = E + I0R
Q359.
A single phase cycloconverter with centre tapped input transformer requires

a.

2 thyristors

b.

4 thyristors

c.

8 thyristors

d.

either 2 or 4 thyristors

Discuss
Answer: (b).4 thyristors
Q360.
In a 3 phase bridge inverter with 120° mode of operation the. number of thyristors conducting at one time are

a.

1

b.

2

c.

3

d.

4

Discuss
Answer: (b).2
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