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.
In a 3 phase full converter, the firing angle is less than 60°. The instantaneous output voltage

a.

will have positive part only

b.

will have both positive and negative parts

c.

may have both positive and negative parts

d.

will have negative part if load is inductive

Discuss
Answer: (a).will have positive part only
Q122.
Which converter is used in HVDC transmission?

a.

3 pulse

b.

6 pulse

c.

12 pulse

d.

24 pulse

Discuss
Answer: (c).12 pulse
Q123.
Assertion (A): The turn on time of SCR is about 1 to 4 ms.

Reason (R): The turn off time of SCR is about 10 to 300 ms.

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
Q124.
Which chopper circuit operates in all the 4 quadrants?

a.

A

b.

C

c.

D

d.

E

Discuss
Answer: (d).E
Q125.
A single phase half wave converter is feeding a resistive load. Just before triggering, the voltage across thyristor is

a.

zero

b.

about 1 V

c.

same as input voltage

d.

twice the input voltage

Discuss
Answer: (c).same as input voltage
Q126.
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
Q127.
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
Q128.
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.

15√2 A

c.

15 A

d.

15/√2 A

Discuss
Answer: (c).15 A
Q129.
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
Q130.
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
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