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 16 of 42

Discover more Topics under Electronics and Communication Engineering

Q151.
A thyristor has its gate current zero. To start conduction the forward voltage must exceed

a.

about 0.5 V

b.

forward breakover voltage

c.

on state voltage

d.

peak working off state forward voltage

Discuss
Answer: (b).forward breakover voltage
Q152.
Assertion (A): Snubber circuit has an RC series circuit in parallel with SCR

Reason (R): Voltage across a capacitor can not change instantaneously.

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
Q153.
If Ar and Ac are the amplitudes of reference and control signals, the modulation index M is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q154.
For a single phase half wave converter feeding a resistive load, the firing angle a. The waveshape in below figure is for

a.

output voltage

b.

input voltage

c.

voltage drop across thyristor

d.

none of the above

Discuss
Answer: (d).none of the above
Q155.
A single phase fully controlled bridge converter is feeding an RLE load. Input voltage is Vm sin ฯ‰t and firing angle is ฮฑ. If average current is Iโ‚€, then

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q156.
The gate lead, in a thyristor is welded to :

a.

p layer to which anode is connected

b.

n layer nearest to the anode terminal

c.

p layer nearest to the cathode terminal

d.

outside n layer

Discuss
Answer: (b).n layer nearest to the anode terminal
Q157.
In a 3 phase full converter, the firing angle is less than 60°. The instantaneous output voltage

a.

will have positive part only

b.

will have both positive and negative parts

c.

may have both positive and negative parts

d.

will have negative part if load is inductive

Discuss
Answer: (a).will have positive part only
Q158.
Which converter is used in HVDC transmission?

a.

3 pulse

b.

6 pulse

c.

12 pulse

d.

24 pulse

Discuss
Answer: (c).12 pulse
Q159.
Assertion (A): The turn on time of SCR is about 1 to 4 ms.

Reason (R): The turn off time of SCR is about 10 to 300 ms.

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
Q160.
Which chopper circuit operates in all the 4 quadrants?

a.

A

b.

C

c.

D

d.

E

Discuss
Answer: (d).E
Page 16 of 42