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 5 of 42

Discover more Topics under Electronics and Communication Engineering

Q41.
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
Q42.
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
Q43.
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
Q44.
The circuit in figure is for

a.

resonant commutation

b.

line commutation

c.

auxiliary commutation

d.

complementary commutation

Discuss
Answer: (d).complementary commutation
Q45.
The symbol in figure is for

a.

SUS

b.

SBS

c.

Shockley diode

d.

UJT

Discuss
Answer: (c).Shockley diode
Q46.
The turn on characteristics of a power transistor can be assumed to be linear, as shown in the below figure . During turn on time T, voltage reduces linearly from V to 0 and current rises linearly from 0 to I. The energy loss during time T is

a.

VIT

b.

VIT/2

c.

VIT/3

d.

VIT/6

Discuss
Answer: (d).VIT/6
Q47.
The circuit in figure is for

a.

resonant commutation

b.

self commutation

c.

load commutation

d.

auxiliary commutation

Discuss
Answer: (b).self commutation
Q48.
If 0.5 T is the time period of oscillations and Toff is the time between turn off of one thyristor and turn on of second thyristor, the frequency of output f of a series inverter is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q49.
In auxiliary commutated chopper fed by voltage V and having L and C commutating elements, the peak value of capacitor current is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (c).C
Q50.
A single phase half wave converter is feeding-a resistor load. The input voltage is v = Vm sin ฯ‰t. If firing angle is zero, the output dc voltage Vdc and output rms voltage Vrms respectively

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (b).B
Page 5 of 42