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 21 of 42

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Q201.
Assertion (A): A high dv/dt may cause triggering of a thyristor.

Reason (R): A high dv/dt results in charging current in the thyristor.

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
Q202.
Assertion (A): When an SCR is conducting, the voltage drop across is about 1 V.

Reason (R): When an SCR is conducting, the junction temperature is about 200°C.

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: (c).A is correct but R is wrong
Q203.
When the core of a saturable reactor is saturated, the inductance is high.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q204.
In controlled heating circuits, thyristors act as

a.

rectifier

b.

inverter

c.

ac regulator

d.

chopper

Discuss
Answer: (c).ac regulator
Q205.
In a fully controlled bridge converter feeding a resistive load the waveshapes of output voltage and output current

a.

are always similar

b.

can never be similar

c.

may be similar or dissimilar

d.

are similar only if ฮฑ = 0

Discuss
Answer: (a).are always similar
Q206.
Assertion (A): A GTO circuit is more compact than SCR circuit

Reason (R): A GTO can be turned off by negative gate pulse.

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
Q207.
In a single phase full wave ac regulator, the firing angles in the two half cycles

a.

are always equal

b.

are sometimes equal

c.

are never equal

d.

may be equal or unequal

Discuss
Answer: (a).are always equal
Q208.
As regards single phase dual converter

a.

the change in operation from one quadrant to the other is faster in non-circulating current mode

b.

the change in operation from one quadrant to the other is faster in circulating current mode

c.

the time response to change in operation from one quadrant to other is the same in both the modes

d.

the time response to change in operation from one quadrant to the other may be faster in any of the two modes

Discuss
Answer: (b).the change in operation from one quadrant to the other is faster in circulating current mode
Q209.
In a semi converter feeding a resistive load, the firing angle is ฮฑ. Each thyristor conducts for

a.

ฯ€ radians

b.

(ฯ€ - ฮฑ) radians

c.

(ฯ€ + ฮฑ) radians

d.

(ฯ€ - 0.5 ฮฑ) radians

Discuss
Answer: (b).(ฯ€ - ฮฑ) radians
Q210.
Between which points does UJT exhibit negative resistance characteristics

a.

between peak and valley points

b.

before peak point

c.

after peak point

d.

after valley point

Discuss
Answer: (a).between peak and valley points
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