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 25 of 42

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Q241.
In a single phase full wave regulator feeding an R-L load, the power factor angle of load is ฮธ. The range of control of firing angle ฮฑ is

a.

0 โ‰ค ฮฑ โ‰ค ฯ€

b.

ฮธ โ‰ค ฮฑ โ‰ค ฯ€

c.

0 โ‰ค ฮฑ โ‰ค (ฯ€ - ฮธ)

d.

ฮธ โ‰ค ฮฑ โ‰ค (ฯ€ + ฮธ)

Discuss
Answer: (b).ฮธ โ‰ค ฮฑ โ‰ค ฯ€
Q242.
A separately excited dc motor is run from a dc source through a chopper. At 600 rpm and rated torque, the duty cycle of chopper is 0.8. At 600 rpm and half the rated torque, the duty cycle is likely to be

a.

0.9

b.

0.8

c.

0.75

d.

0.6

Discuss
Answer: (c).0.75
Q243.
A relaxation oscillator uses

a.

tunnel diode

b.

UJT

c.

both tunnel diode and UJT

d.

PIN diode

Discuss
Answer: (b).UJT
Q244.
In a stud mounted SCR, the stud is

a.

in thermal contact with heat sink

b.

insulated from heat sink

c.

in electrical and thermal contact with heat sink

d.

in either electrical or thermal contact with heat sink

Discuss
Answer: (c).in electrical and thermal contact with heat sink
Q245.
In pulse width modulation of chopper

a.

T is kept constant and Ton is varied

b.

Ton is kept constant T is varied

c.

both T and Ton are varied

d.

either T or Ton is varied

Discuss
Answer: (a).T is kept constant and Ton is varied
Q246.
In a full bridge inverter, the waveshape of load current depends on

a.

relative values of load parameters R, L and C

b.

relative values of load parameters R and L

c.

relative values of load parameters L and C

d.

gating frequency

Discuss
Answer: (a).relative values of load parameters R, L and C
Q247.
A 3 phase bridge inverter is fed by 400 V battery. The load is star connected and has a resistance of 10 ฮฉ per phase. The peak value of thyristor current is

a.

400/10 A

b.

400/15 A

c.

400/20 A

d.

400/30 A

Discuss
Answer: (b).400/15 A
Q248.
The main utility of SCR is due to

a.

gate triggering

b.

high temperature triggering

c.

dv/dt triggering

d.

high breakdown voltage

Discuss
Answer: (a).gate triggering
Q249.
In a single phase full wave ac regulator the firing angles during both half cycles are equal.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True
Q250.
In a 3 phase full wave regulator feeding a star connected resistance load, firing angle is 75°. Then the number of thyristors conducting at one time is

a.

1

b.

2

c.

3

d.

4

Discuss
Answer: (b).2
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