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 15 of 42

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Q141.
A single phase semiconverter is feeding a highly inductive load. The circuit has a freewheeling diode across the load and firing angle is ฮฑ. During one cycle of input voltage, the total duration of conduction of freewheeling diode is

a.

ฮฑ

b.

2 ฮฑ

c.

4 ฮฑ

d.

0.5 ฮฑ

Discuss
Answer: (b).2 ฮฑ
Q142.
During forward blocking state of SCR, the voltage and current respectively are

a.

high and high

b.

low and low

c.

high and low

d.

low and high

Discuss
Answer: (c).high and low
Q143.
In a 3 phase full converter the average load current is 150 A. The average thyristor current is

a.

150 A

b.

75A

c.

50 A

d.

25 A

Discuss
Answer: (c).50 A
Q144.
The two modes of operation of three phase bridge inverters are known as

a.

60° mode and 120° mode

b.

90° mode and 120° mode

c.

120° mode and 180° mode

d.

120° mode and 240° mode

Discuss
Answer: (c).120° mode and 180° mode
Q145.
To protect an SCR against high di/dt we connect

a.

a capacitance in series with SCR

b.

a capacitance in parallel with SCR

c.

an inductance in parallel with SCR

d.

an inductance in series with SCR

Discuss
Answer: (d).an inductance in series with SCR
Q146.
In a parallel inverter

a.

the commutating capacitor C is across the primary of transformer and the load is across the secondary

b.

the commutating capacitor and load are connected across the secondary of transformer

c.

the commutating capacitor C and load are connected in series and the combination is across the secondary of transformer

d.

none of the above

Discuss
Answer: (a).the commutating capacitor C is across the primary of transformer and the load is across the secondary
Q147.
A silicon controlled switch has :

a.

2 leads

b.

3 leads

c.

4 leads

d.

5 leads

Discuss
Answer: (c).4 leads
Q148.
A dc chopper V = 500 V feeds an electric fraction dc series motor. The chopping frequency is 400 Hz. The series inductance required to limit the maximum current swing to 10 A is

a.

20 mH

b.

about 31 mH

c.

about 51 mH

d.

about 92 mH

Discuss
Answer: (b).about 31 mH
Q149.
A single phase fully controlled bridge rectifier is fed by a source having inductance. The output voltage during overlap period is

a.

Vm

b.

0.5 Vm

c.

zero

d.

0.5 Vm - voltage drop across inductance

Discuss
Answer: (c).zero
Q150.
A single phase half wave converter is used to charge a battery of 50 V. The thyristor is continuously fired by dc signal. Input voltage is v = Vm sin ฯ‰t. The thyristor will conduct

a.

from 0 to 180°

b.

when v > 50 V

c.

from 0 to 90°

d.

When v < 50 V

Discuss
Answer: (b).when v > 50 V
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