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 31 of 42

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Q301.
In the basic series inverter circuit, the source current has

a.

low harmonic content

b.

high harmonic content

c.

low or high harmonic content depending on firing angle

d.

zero harmonic content

Discuss
Answer: (b).high harmonic content
Q302.
Thyristors connected in series need static and dynamic stabilizing circuits.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True
Q303.
In a controlled rectifier a freewheeling diode is necessary if the load is

a.

inductive

b.

resistive

c.

capacitive

d.

any of the above

Discuss
Answer: (a).inductive
Q304.
For an illumination control circuit it is advisable to use a matched TRIAC-DIAC pair.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True
Q305.
In a series inverter

a.

the commutating elements carry full load current

b.

the commutating elements carry upto 50% of load current

c.

the commutating elements do not carry load current

d.

any of the above

Discuss
Answer: (a).the commutating elements carry full load current
Q306.
A NAND gate has 3 inputs and one output. The number of thyristors required for this gate are

a.

1

b.

2

c.

3

d.

3 or 4

Discuss
Answer: (c).3
Q307.
Which of these devices is used in relaxation oscillator?

a.

UJT

b.

SCR

c.

DIAC

d.

TRIAC

Discuss
Answer: (a).UJT
Q308.
In a single phase semiconverter feeding a highly inductive load, the load current is

a.

sinusoidal

b.

nearly constant

c.

absolutely constant

d.

rectangular

Discuss
Answer: (b).nearly constant
Q309.
Two thyristors of the same rating and specifications

a.

will have equal on state voltage drops

b.

will have equal forward blocking voltage for the same current

c.

will have different on state voltage drops

d.

may have equal or different on state voltage drops and equal or different forward blocking voltage's for the same current

Discuss
Answer: (d).may have equal or different on state voltage drops and equal or different forward blocking voltage's for the same current
Q310.
A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the starting torque is 100 N-m. At 25 Hz, the starting torque

a.

will be less than 100 N-m

b.

will be more than 100 N-m

c.

may be more or less than 100 N-m depending on motor parameters

d.

very small

Discuss
Answer: (b).will be more than 100 N-m
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