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 13 of 42

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Q121.
UJT can be used for

a.

firing an SCR

b.

turning off an SCR

c.

both firing and turning off an SCR

d.

none of the above

Discuss
Answer: (a).firing an SCR
Q122.
In a series inverter supplying a load resistance R, the commutating elements L and C should be such that

a.

R² = 4L/C

b.

R² < 4L/C

c.

R² > 4L/C

d.

R² < 2L/C

Discuss
Answer: (b).R² < 4L/C
Q123.
In a full wave converter (M - 2 connection) feeding an RLE load, the peak thyristor current is 15 A. For fully controlled bridge circuit and same load current, the peak thyristor current will be

a.

30 A

b.

15โˆš2 A

c.

15 A

d.

15/โˆš2 A

Discuss
Answer: (c).15 A
Q124.
Induction heating systems require low frequency inverters.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q125.
A single phase half wave controlled rectifier circuit has an R-L load. A freewheeling diode is also in the circuit. When freewheeling diode is conducting the SCR

a.

is forward biased

b.

is reverse biased

c.

may be forward biased or reverse biased

d.

forward biased initially but reverse biased afterwards

Discuss
Answer: (b).is reverse biased
Q126.
An SBS can conduct is one direction only.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q127.
A 750 A circuit uses thyristor of current rating 175 A. If derating is 25%, the number of thyristors in parallel is

a.

3

b.

4

c.

6

d.

10

Discuss
Answer: (c).6
Q128.
Assertion (A): An inverter does not require forced commutation

Reason (R): A series inverter is a forced commutation inverter.

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: (d).A is wrong but R is correct
Q129.
In a single phase full wave converter (M - 2 connection), the rms transformer voltage is 300 V across each half of secondary. The PIV for each thyristor is

a.

300 V

b.

300/โˆš2 V

c.

600โˆš2 V

d.

300/2 V

Discuss
Answer: (c).600โˆš2 V
Q130.
A dc separately excited motor has a constant field current. The armature is fed from a single phase supply through a semi-converter. When ฮฑ = 0, speed is 600 rpm. If ฮฑ = 90°, the speed is likely to be

a.

about 300 rpm

b.

about 150 rpm

c.

about 75 rpm

d.

about zero

Discuss
Answer: (a).about 300 rpm
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