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 38 of 42

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Q371.
In a fully controlled bridge converter feeding a resistive load the waveshapes of output voltage and output current

a.

are always similar

b.

can never be similar

c.

may be similar or dissimilar

d.

are similar only if ฮฑ = 0

Discuss
Answer: (a).are always similar
Q372.
Assertion (A): A GTO circuit is more compact than SCR circuit

Reason (R): A GTO can be turned off by negative gate pulse.

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: (a).Both A and R are correct and R is correct explanation of A
Q373.
In a single phase full wave ac regulator, the firing angles in the two half cycles

a.

are always equal

b.

are sometimes equal

c.

are never equal

d.

may be equal or unequal

Discuss
Answer: (a).are always equal
Q374.
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
Q375.
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
Q376.
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
Q377.
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
Q378.
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
Q379.
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
Q380.
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°
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