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 32 of 42

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Q311.
Which of these devices is used in relaxation oscillator?

a.

UJT

b.

SCR

c.

DIAC

d.

TRIAC

Discuss
Answer: (a).UJT
Q312.
In a single phase semiconverter feeding a highly inductive load, the load current is

a.

sinusoidal

b.

nearly constant

c.

absolutely constant

d.

rectangular

Discuss
Answer: (b).nearly constant
Q313.
Two thyristors of the same rating and specifications

a.

will have equal on state voltage drops

b.

will have equal forward blocking voltage for the same current

c.

will have different on state voltage drops

d.

may have equal or different on state voltage drops and equal or different forward blocking voltage's for the same current

Discuss
Answer: (d).may have equal or different on state voltage drops and equal or different forward blocking voltage's for the same current
Q314.
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
Q315.
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
Q316.
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
Q317.
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
Q318.
A load commutated chopper circuit has

a.

one thyristor

b.

two thyristors

c.

four thyristors

d.

six thyristors

Discuss
Answer: (c).four thyristors
Q319.
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
Q320.
A TRIAC is equivalent to

a.

two thyristors in series

b.

two thyristors in parallel

c.

one thyristor and one diode

d.

one thyristor and one transistor

Discuss
Answer: (b).two thyristors in parallel
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