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Electronics and Communication Engineering (ECE) Exam  >  Electronics and Communication Engineering (ECE) Test  >  GATE ECE (Electronics) Mock Test Series 2027  >  Test: Amplitude Modulation - Electronics and Communication Engineering (ECE) MCQ

GATE ECE (Electronics) Test: Amplitude Modulation Free Online Test 2026


MCQ Practice Test & Solutions: Test: Amplitude Modulation (10 Questions)

You can prepare effectively for Electronics and Communication Engineering (ECE) GATE ECE (Electronics) Mock Test Series 2027 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Amplitude Modulation". These 10 questions have been designed by the experts with the latest curriculum of Electronics and Communication Engineering (ECE) 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 30 minutes
  • - Number of Questions: 10

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Test: Amplitude Modulation - Question 1
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The carrier amplitude after AM varies between 4 volts and 1 volt. The depth of modulation is

Detailed Solution: Question 1

We know that,
Modulation index;

Given, Vmax = 4 volt and Vmin  = 1 volt
∴ 

Test: Amplitude Modulation - Question 2
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A sinusoidal carrier has an amplitude of 10 V and frequency 30 kHz. It is amplitude modulated by a sinusoidal voltage of amplitude 3 V and frequency 1 kHz. The spectrum of AM wave will be represented as

Detailed Solution: Question 2

Given,

∴ Modulation index,

The sideband frequencies are as under:

Amplitude of each sideband

Hence, the spectrum of AM wave will be as shown in figure below.

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Test: Amplitude Modulation - Question 3
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Assertion (A): The principle of envelope detection of an AM signal is based on multiplying the incoming signal with the locally generated synchronous carrier and pass the product through a LPF.
Reason (R): An envelope detector produces an output signal that follows the envelope of the input AM signal exactly.

Detailed Solution: Question 3

The principle of envelope detection of an AM signal is based on rectifying the incoming signal and passing it through a LPF. Hence, assertion is false. Assertion is the principle of synchronous detection.

Test: Amplitude Modulation - Question 4
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Consider the following statements associated with the synchronous detection method for detection/demodulation of AM signals:
1. The circuit complexity is very less.
2. It introduces frequency and phase errors only.
3. it does not require any locally generated synchronous carrier.
4. It can be used for DSB-SC, SSB and VSB but not for DSB-FC.
Which of the statements given above is/are correct?

Detailed Solution: Question 4

• The circuit complexity of synchronous detection is very high. Hence, statement-1 is not correct.
• Statement-2 is correct.
• Synchronous detection require a locally generated synchronous carrier. Hence, statement-3 is not correct.
• Statement-4 is correct because synchronous detection is used for DSB-SC, SSB and VSB while envelope detection is used for DSB-FC only.

Test: Amplitude Modulation - Question 5
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Assertion (A): in amplitude modulation, the higher percentage of modulation is preferred.
Reason (R): The modulation index of more than 100% can be achieved without compromising the envelope distortion.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Detailed Solution: Question 5

In amplitude modulation, the higher percentage of modulation is preferred because the higher value of percentage of modulation results into a strong and more intelligible received signal which is less likely to get contaminated or lost in the noise. A modulation index of more than 100% results into over modulation which introduces envelope distortion. Hence, assertion is true but reason is false.

Test: Amplitude Modulation - Question 6
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The types of distortions which can occur in the envelope detector output is/are

Detailed Solution: Question 6

Diagonal Clipping

This type of distortion occurs when the RC time constant of the load circuit is too long. Due to this, the RC circuit cannot follow the fast changes in the modulating envelop.diagonal clipping

Negative Peak Clipping

This distortion occurs due to a fact that the modulation index on the output side of the detector is higher than that on its input side .

Hence, at higher depth of modulation of the transmitted signal, the overmodulation may takes place at the output of the detector .

The negative peak clipping will take place as a result of this overmodulation.

negative peak clipping

Test: Amplitude Modulation - Question 7
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A 400 Watts carrier is modulated to a depth of 75 percent. Assuming the modulating signal to a sinusoidal one, the total power in the amplitude-modulated wave is

Detailed Solution: Question 7

Given,
Pc = 400 Watt, ma = 0.75
The total power in the amplitude modulated wave is:

Test: Amplitude Modulation - Question 8
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The modulation index of the low level emitter modulator is 0.7, voltage gain without modulating signal is AQ = 100, carrier frequency fc = 1 MHz. The amplitude of carrier is 10 mV. If the modulating frequency is 1 kHz, the range of voltage gain is

Detailed Solution: Question 8

We have:

or, 
and,

Hence, the range of A = 30 to 170

Test: Amplitude Modulation - Question 9
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The antenna current of an AM transmitter is 8 A if only the carrier is sent, but it increases to 8.93 A if the carrier is modulated by a single sinusoidal wave. What is the antenna current when the percent of modulation is 80%?

Detailed Solution: Question 9

Given, Ic = 8 a, ma = 0.8
We know that, antenna current is

Test: Amplitude Modulation - Question 10
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The antenna current of an AM transmitter is 10 A when it is modulated to depth of 30% by an audio signal. It increases to 11 A when another signal modulates the carrier signal. The modulation index due to second signal is

Detailed Solution: Question 10

Given,

We know that, the overall modulation index is:

or, 
Now, 
or, 

After modulating with the second signal, we have


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About this Electronics and Communication Engineering (ECE) Practice Test

This test contains 10 MCQs on Amplitude Modulation with detailed solutions for each question. It is part of the GATE ECE (Electronics) Mock Test Series 2027 course on EduRev, designed to align with the current Electronics and Communication Engineering (ECE) syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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