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 17 of 42

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Q161.
In a 3 phase fully controlled converter the firing frequency is

a.

3 times the line frequency

b.

6 times the line frequency

c.

9 times the line frequency

d.

12 times the line frequency

Discuss
Answer: (b).6 times the line frequency
Q162.
Two thyristor of same rating and same specifications

a.

will have equal turn on and turn off periods

b.

will have equal turn on but unequal turn off periods

c.

may have equal or unequal turn on and turn off periods

d.

will have unequal turn on and turn off periods

Discuss
Answer: (c).may have equal or unequal turn on and turn off periods
Q163.
The amount of dielectric heating is inversely proportional to frequency.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q164.
A semiconverter feeding an RLE load operates in

a.

first quadrant only

b.

first and second quadrants

c.

first and fourth quadrants

d.

first and third quadrants

Discuss
Answer: (a).first quadrant only
Q165.
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
Q166.
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
Q167.
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
Q168.
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
Q169.
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
Q170.
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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