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 7 of 42

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Q61.
Assertion (A): An ideal rectifier should have unity harmonic factor

Reason (R): An ideal rectifier should have unity displacement factor.

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: (d).A is wrong but R is correct
Q62.
A single phase half wave rectifier is feeding a resistive load. When ฮฑ = 0, dc output voltage is 127 V. When ฮฑ = 30°, the dc output voltage will be about

a.

127 V

b.

120 V

c.

110 V

d.

100 V

Discuss
Answer: (b).120 V
Q63.
A two winding transformer is feeding a single phase half wave rectifier circuit. The load is purely resistive. The rms value of transformer secondary current is Is and rms value of load current in Irms. Then

a.

Is = Irms irrespective of the value of firing angle

b.

Is = 0.5 Irms irrespective of the value of firing angle

c.

Is = Irms if firing angle is less than 30°

d.

Is = Irms if firing angle is more than 30°

Discuss
Answer: (a).Is = Irms irrespective of the value of firing angle
Q64.
The terminals of a power BJT are called

a.

emitter, base, collector

b.

emitter, base, drain

c.

source, base, drain

d.

source, base, collector

Discuss
Answer: (a).emitter, base, collector
Q65.
In single phase half wave regulator, the average current over one full cycle

a.

is always positive

b.

may be positive or negative

c.

may be negative

d.

is always negative

Discuss
Answer: (d).is always negative
Q66.
The dynamic equalising circuit consists of a series combination of capacitor C and resistor RC across each thyristor. This resistance RC (along with parallel connected diode)

a.

limits charging current

b.

limits discharging current

c.

limits both charging and discharging currents

d.

none of the above

Discuss
Answer: (b).limits discharging current
Q67.
A single phase semiconverter is feeding a highly inductive load and has freewheeling diode across the load. The waveshapes of output voltage and output current

a.

are similar

b.

are not similar

c.

may be similar or dissimilar

d.

are similar only if firing angle is zero

Discuss
Answer: (b).are not similar
Q68.
An SCR is triggered at 40° in the positive half cycle only. The average anode current is 50 A. If the firing angle is changed to 80°, the average anode current is likely to be

a.

50 A

b.

25 A

c.

less than 50 A but more than 25 A

d.

less than 25 A

Discuss
Answer: (c).less than 50 A but more than 25 A
Q69.
The characteristics of a non-linear resistance is i = kvโด. If i becomes 100 times, v becomes

a.

about 100 times

b.

about 10 times

c.

about 3 times

d.

about twice

Discuss
Answer: (c).about 3 times
Q70.
In a step down chopper using pulse width modulation, Ton = 3 x 10¯³ and Toff = 1 x 10¯³ s. The chopping frequency is

a.

333.33

b.

250

c.

500

d.

1000

Discuss
Answer: (b).250
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