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 21 of 42

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Q201.
As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True
Q202.
In a certain inverter circuit each thyristor carries 26.67 A for 60°, 13.33 A for 120° and zero A for 180° of the cycle. The rms current of thyristor is

a.

20 A

b.

13.33 A

c.

6.67 A

d.

3.33 A

Discuss
Answer: (b).13.33 A
Q203.
The factor ฮท for a UJT is about

a.

0.1

b.

0.2

c.

0.6

d.

0.9

Discuss
Answer: (c).0.6
Q204.
In a single phase full converter fed by a source having inductance, the number of thyristors conducting during overlap is

a.

1

b.

2

c.

3

d.

4

Discuss
Answer: (d).4
Q205.
The cut in voltages for germanium and silicon diodes respectively as

a.

0.3 V and 0.7 V

b.

0.7 V and 0.3 V

c.

0.6 V and 0.9 V

d.

0.5 V and 0.7 V

Discuss
Answer: (a).0.3 V and 0.7 V
Q206.
Assertion (A): A GTO can be turned on and turned off by gate pulses

Reason (R): A GTO can be turned off by negative gate pulse.

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
Q207.
In a full bridge single phase inverter feeding RLC load

a.

one thyristor and one diode conduct simultaneously

b.

two thyristors conduct simultaneously

c.

two thyristors or two diodes conduct simultaneously

d.

four thyristors conduct simultaneously

Discuss
Answer: (c).two thyristors or two diodes conduct simultaneously
Q208.
It is possible to use a freewheeling diode in

a.

single phase half wave controlled rectifier as well as in single phase full wave controlled rectifier (M - 2 connection)

b.

single phase half wave controlled rectifier but not in single phase full wave controlled rectifier (M - 2 connection)

c.

single phase full wave controlled rectifier (M - 2 connection) but not in single phase half wave controlled rectifier

d.

all controlled rectifier circuits

Discuss
Answer: (d).all controlled rectifier circuits
Q209.
Assertion (A): When the anode current of an SCR starts increasing during turn on process, the anode cathode voltage drop starts decreasing.

Reason (R): During turn on the reverse biased junction in SCR breaksdown.

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
Q210.
An SCR is triggered at 80° in the positive half cycle, only. The rms anode current is 25 A. If the firing angle is changed to 160°, the rms current is likely to be

a.

25 A

b.

12.5 A

c.

less than 25 A

d.

less than 12.5 A

Discuss
Answer: (d).less than 12.5 A
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