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 29 of 42

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Q281.
Assertion (A): McMurray Bredford half bridge inverter uses complementary commutation

Reason (R): Three phase inverter can have two modes of operation.

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
Q282.
In a single phase full wave ac regulator feeding R-L load, the gate pulses

a.

are always of short duration

b.

may be of short duration

c.

should be rectangular with width (ฯ€ - ฮฑ)

d.

cannot be rectangular with width (ฯ€ - ฮฑ)

Discuss
Answer: (c).should be rectangular with width (ฯ€ - ฮฑ)
Q283.
In a semi converter feeding a resistive load,

a.

the waveshapes of input voltage and input current are always similar

b.

the waveshapes of input voltage and input current can never be similar

c.

the waveshapes of input voltage and input current are similar only if firing angle is zero

d.

the waveshapes of input voltage and input current are similar only if firing angle is high

Discuss
Answer: (c).the waveshapes of input voltage and input current are similar only if firing angle is zero
Q284.
In a single phase semi-converter the number of thyristors is

a.

16

b.

8

c.

4

d.

2

Discuss
Answer: (d).2
Q285.
A dc chopper is feeding an RLE load. The current can become discontinuous if

a.

R/L is high

b.

ฮฑ is low

c.

E is high

d.

none of the above

Discuss
Answer: (d).none of the above
Q286.
Which of these commutation methods uses two leads?

a.

Class A

b.

Class B

c.

Class C

d.

Class D

Discuss
Answer: (d).Class D
Q287.
In rectifier circuits, the rms value of ac component of output voltage is equal to

a.

Vrms

b.

0.5 Vrms

c.

(Vrms - Vdc)²0.5

d.

(Vrms² - Vdc²)^0.5

Discuss
Answer: (d).(Vrms² - Vdc²)^0.5
Q288.
A UJT exhibits negative resistance characteristics when

a.

Current is less than valley current

b.

Current is less than peak current

c.

Current is more than peak current but less than valley current

d.

None of the above

Discuss
Answer: (c).Current is more than peak current but less than valley current
Q289.
In rectifier circuits, ripple factor RF and form factor FF are related as

a.

RF = (FF² - 1)^0.5

b.

RF = FF

c.

RF = FF - 1

d.

RF = (FF - 1)^0.5

Discuss
Answer: (a).RF = (FF² - 1)^0.5
Q290.
If we connect two silicon unilateral switches in anti- parallel we get

a.

SCR

b.

SBS

c.

SCS

d.

UJT

Discuss
Answer: (b).SBS
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