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 20 of 42

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Q191.
A chopper cannot be line commutated.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True
Q192.
Natural commutation can be used in :

a.

DC circuits only

b.

AC circuits only

c.

both AC and DC circuits

d.

none of the above

Discuss
Answer: (b).AC circuits only
Q193.
In a thyristor the gate lead is connected to the n layer near the p layer to which anode is connected.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q194.
A single phase half wave rectifier circuit has a free wheeling diode. The free wheeling diode will conduct only if

a.

load is purely resistive

b.

load is purely inductive

c.

load is combination of R and L

d.

load is purely inductive or combination of R and L

Discuss
Answer: (d).load is purely inductive or combination of R and L
Q195.
McMurray Bedford full bridge inverter uses

a.

natural commutation

b.

auxiliary commutation

c.

complementary commutation

d.

any of the above

Discuss
Answer: (c).complementary commutation
Q196.
A single phase half wave converter is feeding a resistive load. Output dc power is Pdc and total power delivered to load is Pac then

a.

Pdc = Pac for all values of firing angles

b.

Pdc = Pac if firing angle is less than 180°

c.

Pdc < Pac for all values of firing angles

d.

Pdc < Pac if firing angle is less than 180°

Discuss
Answer: (d).Pdc < Pac if firing angle is less than 180°
Q197.
Which of the following devices exhibit negative resistance characteristics?

a.

UJT

b.

PUT

c.

Both UJT and PUT

d.

UJT, PUT and SBS

Discuss
Answer: (c).Both UJT and PUT
Q198.
In integral cycle control of ac regulators, the period of integral cycle control, i.e., (m + n) T should be

a.

less than mechanical or thermal time constant of the system

b.

more than the mechanical or thermal time constant of the system

c.

more or less than the mechanical or thermal time constant

d.

very high

Discuss
Answer: (a).less than mechanical or thermal time constant of the system
Q199.
All other parameters remaining the same, a 3 phase bridge inverter with 180° mode of operation

a.

has the same peak thyristor current as in 120° mode of operation

b.

has higher peak thyristor current than in 120° mode of operation

c.

has lower peak thyristor current than in 120° mode of operation

d.

any of the above

Discuss
Answer: (b).has higher peak thyristor current than in 120° mode of operation
Q200.
As compared to BJT, MOSFET has

a.

lower switching losses and higher conduction losses

b.

higher switching losses and higher conduction losses

c.

higher switching losses and lower conduction losses

d.

lower switching losses and lower conduction losses

Discuss
Answer: (a).lower switching losses and higher conduction losses
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