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 22 of 42

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Q211.
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€
Q212.
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
Q213.
A relaxation oscillator uses

a.

tunnel diode

b.

UJT

c.

both tunnel diode and UJT

d.

PIN diode

Discuss
Answer: (b).UJT
Q214.
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
Q215.
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
Q216.
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
Q217.
The characteristics of which device has peak point and valley point

a.

SCR

b.

PUT

c.

SCS

d.

Shockley diode

Discuss
Answer: (b).PUT
Q218.
In brushless excitation system of modern alternators, the main exciter is

a.

dc generator

b.

ac generator

c.

either dc or ac generator

d.

induction generator

Discuss
Answer: (b).ac generator
Q219.
The two-transistor model of a thyristor consists of two transistors :

a.

one n-p-n and other p-n-p

b.

both p-n-p

c.

both n-p-n

d.

one n-p-n and other UJT

Discuss
Answer: (a).one n-p-n and other p-n-p
Q220.
In a thyristor, the forward breakover voltage

a.

is constant

b.

may be constant or may depend on gate current

c.

decreases as gate current is increased

d.

increases as gate current is increased

Discuss
Answer: (c).decreases as gate current is increased
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