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 28 of 42

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Q271.
In thermal ohm's law, temperature and power loss are analogous to

a.

V and I respectively of ohm's law

b.

I and V respectively of ohm's law

c.

R and V respectively of ohm's law

d.

I and R respectively of ohm's law

Discuss
Answer: (b).I and V respectively of ohm's law
Q272.
A string of series connected thyristors needs equalising circuit to

a.

ensure proper firing

b.

ensure proper current division

c.

ensure proper voltage division

d.

none of the above

Discuss
Answer: (c).ensure proper voltage division
Q273.
A surge voltage

a.

has very high magnitude and very long duration

b.

has very high magnitude and very small duration

c.

has very high magnitude and very small duration and can be positive or negative

d.

can be only positive

Discuss
Answer: (c).has very high magnitude and very small duration and can be positive or negative
Q274.
The minimum gate current which can turn on SCR is called :

a.

trigger current

b.

holding current

c.

junction current

d.

breakover current

Discuss
Answer: (a).trigger current
Q275.
A thyristor circuit is feeding an R-L load. The turn on time can be reduced by

a.

decreasing R

b.

decreasing L

c.

increasing L

d.

decreasing R and L together

Discuss
Answer: (b).decreasing L
Q276.
A single phase semiconverter is supplying RLE load and has a freewheeling diode across the load. The firing angle is ฮฑ. The freewheeling diode conducts for

a.

ฮฑ° in each half cycle

b.

(ฯ€ - ฮฑ)° in each cycle

c.

ฮฑ° in one full cycle

d.

(ฯ€ + ฮฑ)° in each half cycle

Discuss
Answer: (a).ฮฑ° in each half cycle
Q277.
In a single phase full wave regulator feeding a resistive load, the average current over one full cycle

a.

is always zero

b.

cannot be zero

c.

may be sometimes zero

d.

is always positive

Discuss
Answer: (a).is always zero
Q278.
The total number of leads in MOS controlled thyristor is

a.

2

b.

3

c.

4

d.

2 or 3

Discuss
Answer: (b).3
Q279.
Assertion (A): Chopper always requires forced commutation

Reason (R): Morgan chopper uses a saturable reactor.

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
Q280.
In a power diode the reverse recovery time is the time from the instant the forward current is zero to the instant when reverse recovery current has decayed to

a.

50% of peak reverse current

b.

25% of peak reverse current

c.

10% of peak reverse current

d.

zero value

Discuss
Answer: (a).50% of peak reverse current
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