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 19 of 42

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Q181.
As regards single phase dual converter

a.

the change in operation from one quadrant to the other is faster in non-circulating current mode

b.

the change in operation from one quadrant to the other is faster in circulating current mode

c.

the time response to change in operation from one quadrant to other is the same in both the modes

d.

the time response to change in operation from one quadrant to the other may be faster in any of the two modes

Discuss
Answer: (b).the change in operation from one quadrant to the other is faster in circulating current mode
Q182.
In a semi converter feeding a resistive load, the firing angle is ฮฑ. Each thyristor conducts for

a.

ฯ€ radians

b.

(ฯ€ - ฮฑ) radians

c.

(ฯ€ + ฮฑ) radians

d.

(ฯ€ - 0.5 ฮฑ) radians

Discuss
Answer: (b).(ฯ€ - ฮฑ) radians
Q183.
Between which points does UJT exhibit negative resistance characteristics

a.

between peak and valley points

b.

before peak point

c.

after peak point

d.

after valley point

Discuss
Answer: (a).between peak and valley points
Q184.
A thyristor has maximum allowable junction temperature of 110° C and the ambient temperature is 40°C, If the maximum internal power dissipation is 50 W, the thermal resistance is

a.

2° C/W

b.

1.4° C/W

c.

0.7°C/W

d.

2.2° C/W

Discuss
Answer: (b).1.4° C/W
Q185.
A single phase electric heater uses phase controlled thyristors. The firing angle is 90°. The degree of heating is

a.

25% of maximum

b.

50% of maximum

c.

75% of maximum

d.

none of the above

Discuss
Answer: (b).50% of maximum
Q186.
Which of these commutation methods is used in AC-DC converters?

a.

Class A

b.

Class C

c.

Class D

d.

Class F

Discuss
Answer: (d).Class F
Q187.
In a 3 phase semiconverter, the dc output voltage for a certain firing angle is 50% of the maximum possible value. The firing angle is

a.

30°

b.

60°

c.

90°

d.

120°

Discuss
Answer: (c).90°
Q188.
A high frequency series inverter consists of

a.

a number of series inverters in series

b.

a number of series inverters in parallel

c.

a number of parallel inverters in parallel

d.

a number of parallel inverters in series

Discuss
Answer: (b).a number of series inverters in parallel
Q189.
In an SCR, the anode current consists of

a.

only holes

b.

only electrons

c.

both electrons and holes

d.

either electrons or holes

Discuss
Answer: (c).both electrons and holes
Q190.
A 3 phase semiconverter when supplying a certain load has a rectification efficiency of 0.6 and transformer utilisation factor of 0.35. When a 3 phase full converter is supplying the same load

a.

rectification efficiency will be more than 0.6 and TUF will be more than 0.35

b.

rectification efficiency will be more than 0.6 but TUF will be less than 0.35

c.

rectification efficiency will be less than 0.6 and TUF will be less than 0.35

d.

rectification efficiency will be less than 0.6 but TUF will be more than 0.35

Discuss
Answer: (a).rectification efficiency will be more than 0.6 and TUF will be more than 0.35
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