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 18 of 42

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Q171.
A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the starting torque is 100 N-m. At 25 Hz, the starting torque

a.

will be less than 100 N-m

b.

will be more than 100 N-m

c.

may be more or less than 100 N-m depending on motor parameters

d.

very small

Discuss
Answer: (b).will be more than 100 N-m
Q172.
In a three phase to single phase full wave bridge cycloconverter, the number of thyristors is

a.

36

b.

18

c.

12

d.

8

Discuss
Answer: (c).12
Q173.
In a cycloconverter it is possible to vary

a.

only output frequency

b.

only output voltage

c.

both output voltage and frequency but not simultaneously

d.

both output voltage and output frequency simultaneously

Discuss
Answer: (d).both output voltage and output frequency simultaneously
Q174.
Lead mounting for SCR is used for

a.

rating less than mA

b.

rating about 1 A or less

c.

rating of 20 A or less than 20 A

d.

rating 100 A or less

Discuss
Answer: (b).rating about 1 A or less
Q175.
A load commutated chopper circuit has

a.

one thyristor

b.

two thyristors

c.

four thyristors

d.

six thyristors

Discuss
Answer: (c).four thyristors
Q176.
The total number of leads in reverse conducting thyristor is

a.

2

b.

3

c.

1

d.

4

Discuss
Answer: (b).3
Q177.
Assertion (A): A TRIAC is a bidirectional SCR.

Reason (R): A TRIAC is a four layers 3 terminal device and can conduct in both directions.

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
Q178.
The value of capacitor C for dynamic equalising circuit of series connected thyristors is determined by

a.

forward characteristics of thyristors

b.

reverse recovery characteristics of thyristors

c.

both forward and reverse recovery characteristics of thyristors

d.

none of the above

Discuss
Answer: (b).reverse recovery characteristics of thyristors
Q179.
A chopper

a.

converts constant voltage dc into ac and then into variable voltage dc

b.

converts constant voltage dc into variable voltage dc directly

c.

converts ac of one frequency into ac of another frequency

d.

converts ac to dc

Discuss
Answer: (b).converts constant voltage dc into variable voltage dc directly
Q180.
Assertion (A): The output voltage of an inverter can be controlled by PWM technique

Reason (R): In a current source inverter the input current is constant.

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
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