Electronic Devices and Circuits MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Electronic Devices and Circuits, 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 Electronic Devices and Circuits 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 Electronic Devices and Circuits mcq questions that explore various aspects of Electronic Devices and Circuits problems. Each MCQ is crafted to challenge your understanding of Electronic Devices and Circuits 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 Electronic Devices and Circuits 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 Electronic Devices and Circuits. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

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Electronic Devices and Circuits MCQs | Page 30 of 82

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Q291.
Assertion (A): Alkali metals are used as emitters in phototubes.

Reason (R): Alkali metals have low work functions.

a.

Both A and R are true and R is correct explanation of A

b.

Both A and R are true but R is not a correct explanation of A

c.

A is true but R is false

d.

A is false but R is true

Discuss
Answer: (a).Both A and R are true and R is correct explanation of A
Q292.
A JFET operates in ohmic region when

a.

VGS = 0

b.

VGS is less than pinch off voltage

c.

VGS = is Positive

d.

VGS = VDS

Discuss
Answer: (b).VGS is less than pinch off voltage
Q293.
In CE connection, the leakage current of a transistor is about

a.

10 x 10¯โน A

b.

5 x 10¯โถ A

c.

200 x 10¯โถ A

d.

5 x 10¯³ A

Discuss
Answer: (c).200 x 10¯โถ A
Q294.
The early effect in a BJT is caused by

a.

fast turn on

b.

fast turn off

c.

large collector base reverse bias

d.

large emitter base forward bias

Discuss
Answer: (c).large collector base reverse bias
Q295.
In a common emitter BJT amplifier, the maximum usable supply voltage is limited by

a.

avalanche Beakdown of Base-Emitter junction

b.

collector emitter breakdown voltage with base open(ฮฒVCEO)

c.

collector emitter breakdown voltage with emitter open(ฮฒVCEO)

d.

zener break down voltage of the emitter base junction

Discuss
Answer: (c).collector emitter breakdown voltage with emitter open(ฮฒVCEO)
Q296.
Assertion (A): In active region of CE output characteristics of BJT, collector current is nearly constant.

Reason (R): Base current in CE connection is very small.

a.

Both A and R are true and R is correct explanation of A

b.

Both A and R are true but R is not a correct explanation of A

c.

A is true but R is false

d.

A is false but R is true

Discuss
Answer: (a).Both A and R are true and R is correct explanation of A
Q297.
The temperature of cathode is increased from 2500K to 2600K. The increase in thermionic emission current is about

a.

0.1%

b.

4%

c.

50%

d.

150%

Discuss
Answer: (d).150%
Q298.
Consider the following statement:

At finite temperature, magnetic dipoles in a material are randomly oriented giving low magnetization. When magnetic field H is applied, the magnetization?

1. Increases with H
2. Decreases with H
3. Decreases with temp for constant H

Which of the statement given above is/are correct?

a.

1

b.

2

c.

2, 3

d.

1 and 3

Discuss
Answer: (d).1 and 3
Q299.
Ferrites have

a.

low copper loss

b.

low eddy current loss

c.

low resistivity

d.

higher specific gravity compared to iron

Discuss
Answer: (c).low resistivity
Q300.
Eg is the band gap, A is pre-factor, k is Boltzmann constant? Which one of the following is the remaining grade of paper used in paper capacitor, besides the other two grade of paper-low and extra low loss?

a.

Strong dielectric

b.

Regular

c.

Rough

d.

High loss

Discuss
Answer: (b).Regular
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