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1.6 Amplifiers | NEC ELECTRONICS Questions

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1.6 Amplifiers

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Question sets

PANA Academy Past Question Hints and Solutions - Electronics Set2081 · 50 questions 1.1 Basic MCQ2081 · 44 questions 1.2 Theorem MCQ2081 · 26 questions 1.3 AC fundamentals2081 · 29 questions 1.4 BJT MCQs v22081 · 61 questions 1.4 Diode MCQs v22081 · 25 questions 1.5 Signal Generator2081 · 24 questions 1.6 Amplifiers2081 · 11 questions PANA Academy - regulatory-body - Reviewed subset 2026-092083 · 11 questions PANA Academy - professional-practice - Reviewed subset 2026-092083 · 12 questions PANA Academy - project-planning - Reviewed subset 2026-092083 · 15 questions

License Preparation NepalNEC ELECTRONICS

1.6 Amplifiers

Full marks: 11 · Questions: 11

01Power Amplifier Classes

An amplifier that operates in the linear active region at all times (full 360° conduction angle) is a:

A

Class A amplifier

B

Class AB amplifier

C

Class B amplifier

D

Class C amplifier

02Power Amplifier Classes

A certain class A power amplifier delivers 5 W to a load with an input signal power of 100 mW. The power gain is:

A

100

B

50

C

250

D

5

03Power Amplifier Classes

If a series-fed Class A power amplifier draws 4 W of DC power from the supply, its maximum theoretical AC signal power output (at 25% efficiency) is:

A

6 W

B

12 W

C

1 W

D

0.707 W

04Power Amplifier Classes

The conversion efficiency of a power amplifier is formally defined as the ratio of the AC signal power delivered to the load to the:

A

input signal power

B

power dissipated in the output stage

C

total DC power drawn from the power supply

D

none of these answers

05Power Amplifier Classes

The maximum theoretical conversion efficiency of a directly-coupled (series-fed) class A power amplifier is:

A

25%

B

50%

C

79%

D

98%

06Power Amplifier Classes

The transistors in a complementary-symmetry class B push-pull amplifier are biased:

A

deeply into cutoff

B

in saturation

C

at the midpoint of the load line

D

right at cutoff (zero quiescent current)

07Power Amplifier Classes

Crossover distortion is a characteristic problem occurring specifically in:

A

class A amplifiers

B

class AB amplifiers

C

class B push-pull amplifiers

D

all of these amplifiers

08Power Amplifier Classes

The maximum theoretical efficiency of a class B push-pull amplifier is approximately:

A

25%

B

50%

C

79% (π/4 ≈ 78.5%)

D

98%

09Power Amplifier Classes

The maximum theoretical efficiency of a class AB power amplifier is:

A

higher than that of a class B amplifier

B

the same as that of a class A amplifier

C

slightly less than class B (between 50% and 78.5%)

D

lower than 25%

10Power Amplifier Classes

The conversion efficiency of a tuned class C power amplifier is:

A

less than class A

B

less than class B

C

less than class AB

D

greater than classes A, B, or AB (often 80% to 90%+)

11Power Amplifier Classes

The active transistor in a tuned class C power amplifier conducts for:

A

more than one-half of the input cycle

B

exactly one-half of the input cycle (180°)

C

a small fraction of the input cycle (conduction angle less than 180°)

D

the entire 360° of the input cycle

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