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 12 of 42

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Q111.
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
Q112.
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
Q113.
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
Q114.
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
Q115.
The total number of leads in MOS controlled thyristor is

a.

2

b.

3

c.

4

d.

2 or 3

Discuss
Answer: (b).3
Q116.
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
Q117.
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
Q118.
Assertion (A): McMurray Bredford half bridge inverter uses complementary commutation

Reason (R): Three phase inverter can have two modes of operation.

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
Q119.
In a single phase full wave ac regulator feeding R-L load, the gate pulses

a.

are always of short duration

b.

may be of short duration

c.

should be rectangular with width (ฯ€ - ฮฑ)

d.

cannot be rectangular with width (ฯ€ - ฮฑ)

Discuss
Answer: (c).should be rectangular with width (ฯ€ - ฮฑ)
Q120.
In a semi converter feeding a resistive load,

a.

the waveshapes of input voltage and input current are always similar

b.

the waveshapes of input voltage and input current can never be similar

c.

the waveshapes of input voltage and input current are similar only if firing angle is zero

d.

the waveshapes of input voltage and input current are similar only if firing angle is high

Discuss
Answer: (c).the waveshapes of input voltage and input current are similar only if firing angle is zero
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