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 40 of 42

Discover more Topics under Electronics and Communication Engineering

Q391.
In integral cycle control of ac regulators, the period of integral cycle control, i.e., (m + n) T should be

a.

less than mechanical or thermal time constant of the system

b.

more than the mechanical or thermal time constant of the system

c.

more or less than the mechanical or thermal time constant

d.

very high

Discuss
Answer: (a).less than mechanical or thermal time constant of the system
Q392.
All other parameters remaining the same, a 3 phase bridge inverter with 180° mode of operation

a.

has the same peak thyristor current as in 120° mode of operation

b.

has higher peak thyristor current than in 120° mode of operation

c.

has lower peak thyristor current than in 120° mode of operation

d.

any of the above

Discuss
Answer: (b).has higher peak thyristor current than in 120° mode of operation
Q393.
As compared to BJT, MOSFET has

a.

lower switching losses and higher conduction losses

b.

higher switching losses and higher conduction losses

c.

higher switching losses and lower conduction losses

d.

lower switching losses and lower conduction losses

Discuss
Answer: (a).lower switching losses and higher conduction losses
Q394.
A current source inverter has simple commutation circuit.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True
Q395.
In load commutated chopper, the commutating element

a.

is capacitor

b.

is capacitor and inductor

c.

is capacitor, inductor and auxiliary thyristor

d.

any of the above depending on load

Discuss
Answer: (a).is capacitor
Q396.
In a half bridge inverter each thyristor is gated at a frequency f. The output frequency is

a.

2 f

b.

f

c.

0.5 f

d.

0.25 f

Discuss
Answer: (b).f
Q397.
Assertion (A): A transistor has lower voltage drop during conduction as compared to thyristor

Reason (R): Transistors are manufactured in very high voltage and current ratings.

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
Q398.
Assertion (A): Typical value of thermal resistance from source to sink of an SCR is about 0.3° C/W

Reason (R): Heat sinks of thyristors are generally made of aluminium.

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
Q399.
In a thyristors are i = kvแตƒ. The value of a is

a.

about 0.5

b.

about 2

c.

about 5

d.

about 20

Discuss
Answer: (c).about 5
Q400.
In an ordinary thyristor

a.

turn on and turn off times are equal

b.

turn on time is more than turn off time

c.

turn off time is more than turn on time

d.

turn on time may be equal, less than or more than turn off time

Discuss
Answer: (c).turn off time is more than turn on time
Page 40 of 42