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 33 of 42

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Q321.
Which statement is correct?

a.

BJT and MOSFET are current controlled devices

b.

BJT is voltage controlled and MOSFET is current controlled device

c.

BJT and MOSFET are voltage controlled devices

d.

BJT is current controlled and MOSFET is voltage controlled device

Discuss
Answer: (d).BJT is current controlled and MOSFET is voltage controlled device
Q322.
In a three phase series inverter, the firing frequency is

a.

three times output frequency

b.

six times output frequency

c.

twice the output frequency

d.

equal to output frequency

Discuss
Answer: (b).six times output frequency
Q323.
A 3 phase fully controlled converter is a

a.

3 pulse converter

b.

6 pulse converter

c.

2 pulse converter

d.

12 pulse converter

Discuss
Answer: (b).6 pulse converter
Q324.
A cycloconverter is a group of controlled rectifiers.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True
Q325.
A single phase full wave regulator feeds a resistive load. The firing angle of thyristors is 90°. The input power factor is

a.

1

b.

0.707 lagging

c.

0.5 lagging

d.

0.2 lagging

Discuss
Answer: (b).0.707 lagging
Q326.
The leads in a TRIAC are denoted by

a.

anode cathode, gate

b.

T1 T2, gate

c.

T1, T2, anode

d.

T1, T2, T3

Discuss
Answer: (b).T1 T2, gate
Q327.
A step down cycloconverter has an input frequency f. If it uses natural commutation, the output frequency

a.

must be a sub-multiple of input frequency

b.

can be any frequency

c.

must be an even sub-multiple of input frequency

d.

must be an odd sub-multiple of input frequency

Discuss
Answer: (a).must be a sub-multiple of input frequency
Q328.
In a single phase full wave regulator, the rms current in each thyristors is Ir The run load current is equal to

a.

2Ir

b.

√2 Ir

c.

Ir

d.

Ir / √2

Discuss
Answer: (b).√2 Ir
Q329.
In a half bridge inverter, the freewheeling diodes are needed

a.

even when load is resistive

b.

only when load is inductive

c.

only when load is inductive or capacitive

d.

for all types of loads

Discuss
Answer: (c).only when load is inductive or capacitive
Q330.
When a thyristor is conducting, the voltage drop across it

a.

is absolutely constant

b.

decreases with increase in load current

c.

increases slightly with increase in load current

d.

none of the above

Discuss
Answer: (c).increases slightly with increase in load current
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