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 7 of 42

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Q61.
Assertion (A): The circuit of figure thyristor will conduct for 180° during positive half cycle if it is continuously fired.

Reason (R): A thyristor can conduct only when it is forward biased.

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
Q62.
In the below figure, the load is highly inductive. The firing angle is a for each of the thyristors. The periods of conduction of Th1 and Th2 respectively are

a.

0 to ฯ€ and ฯ€ to 2ฯ€

b.

ฮฑ to ฯ€ and ฯ€ + a to 2ฯ€

c.

ฮฑ to ฯ€ + ฮฑ and ฯ€ + ฯ€ to 2ฯ€ + ฮฑ

d.

ฮฑ to ฯ€ - ฮฑ and ฯ€ + ฮฑ to 2ฯ€ - ฮฑ

Discuss
Answer: (c).ฮฑ to ฯ€ + ฮฑ and ฯ€ + ฯ€ to 2ฯ€ + ฮฑ
Q63.
The condition for underdamped oscillations in a series RLC circuit is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (b).B
Q64.
A single phase fully controlled bridge converter is fed by a voltage Vm sin ฯ‰t. The average and rms values of output voltage are

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q65.
Which of the following is correct for a BJT?

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q66.
A fully controlled bridge converter is feeding an RLE load. The load current is Iโ‚€. The input voltage is Vm sin ฯ‰t. The KVL equation to find firing angle ฮฑ is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q67.
The duty cycle of a step down chopper is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q68.
A rectifier is fed by a transformer. The rms voltage and current at secondary of transformer are Vs and Is. Output dc power is Vdc Idc and output ac power is (Vrms ) (Irms), Transformer utilisation factor TUF is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q69.
If Ar and Ac are the amplitudes of reference and control signals, the modulation index M is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q70.
For a single phase half wave converter feeding a resistive load, the firing angle a. The waveshape in below figure is for

a.

output voltage

b.

input voltage

c.

voltage drop across thyristor

d.

none of the above

Discuss
Answer: (d).none of the above
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