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 8 of 42

Discover more Topics under Electronics and Communication Engineering

Q71.
In a thyristor the gate current is increased, then

a.

anode current will increase

b.

anode current will decrease

c.

anode current will remain constant

d.

anode current may increase or decrease

Discuss
Answer: (c).anode current will remain constant
Q72.
Thyristors are not suitable for logic circuits.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q73.
In a circuit using a full wave converter (M - 2 connection) the PIV of each thyristor is 400 V. For the same output voltage and fully controlled bridge converter, PIV will be

a.

400 V

b.

800 V

c.

200 V

d.

200โˆš2 V

Discuss
Answer: (c).200 V
Q74.
A dc separately excited motor has constant field current. The armature is fed from a single phase supply through a full converter. When ฮฑ = 0, speed is 500 rpm. If ฮฑ = 45°, the speed is likely to be

a.

about 350 rpm

b.

about 250 rpm

c.

about 175 rpm

d.

about 125 rpm

Discuss
Answer: (d).about 125 rpm
Q75.
In a multiphase chopper, all choppers operate together.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q76.
The terminals of a power MOSFET are called

a.

emitter, base, collector

b.

source, gate, drain

c.

source, base, drain

d.

emitter, gate, drain

Discuss
Answer: (b).source, gate, drain
Q77.
Assertion (A): The surge current which an SCR can withstand is much higher than rms on state current.

Reason (R): The duration of surge current is very small.

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
Q78.
Current derating may be necessary when thyristors are operating in

a.

series

b.

parallel

c.

series or parallel

d.

none of the above

Discuss
Answer: (b).parallel
Q79.
If duty cycle is a and the load is ฮฑ resistance R, the rms value of output voltage is

a.

ฮฑV

b.

โˆšฮฑ V

c.

ฮฑ²V

d.

ฮฑV/R

Discuss
Answer: (b).โˆšฮฑ V
Q80.
For a BJT, ฮฑ = 0.98, then ฮฒ =

a.

0.02

b.

0.5

c.

4.9

d.

49

Discuss
Answer: (d).49
Page 8 of 42