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Electronics and Communication Engineering (ECE) Exam  >  Electronics and Communication Engineering (ECE) Test  >  GATE ECE (Electronics) Mock Test Series 2027  >  Test: VSBSC (Vestigial Sideband Suppressed Carrier) - Electronics and Communication Engineering (ECE) MCQ

GATE ECE (Electronics) Test: VSBSC (Vestigial Sideband Suppressed Carrier)


MCQ Practice Test & Solutions: Test: VSBSC (Vestigial Sideband Suppressed Carrier) (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: VSBSC (Vestigial Sideband Suppressed Carrier)". 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: VSBSC (Vestigial Sideband Suppressed Carrier) - Question 1
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VSB modulation is termed as ___________.

Detailed Solution: Question 1

VSB (vestigial sideband) transmission transmits one sideband fully and the other sideband partially thus, reducing the bandwidth requirement.

The spectrum of a vestigial sideband is as shown:

Vestigial Sideband Modulation (VSB) is used for video modulation in TV transmission due to the following reasons :

  • Video signal exhibits a large bandwidth and significant low-frequency content which suggests the use of VSB.  
  • VSB (vestigial sideband) transmission transmits one sideband fully and the other sideband partially thus, reducing the bandwidth requirement.
  • The circuitry for demodulation in the receiver should be simple and therefore cheap. VSB demodulation uses simple envelope detection.

Test: VSBSC (Vestigial Sideband Suppressed Carrier) - Question 2
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Which of the following statements are correct w.r.t. the vestigial sideband modulation?
(i) As compared to SSB-SC, the bandwidth of the vestigial sideband becomes larger.
(ii) The filter required needs to have a sharp cut-off.
(iii) The transmitted vestige of the undesired sideband compensates for the loss of the wanted sideband. 
(iv) Vestigial sideband is used in TV for transmission of the picture and sound signals. 

Choose the correct answer from the code given below:

Detailed Solution: Question 2

Concept:

Vestigial Sideband Modulation is a type of amplitude modulation where a part of the signal called vestige is modulated, along with one sideband. The spectrum requirement is between DSB-SC and SSB (less than DSB-SC and more than SSB) (Statement 1 is true)
Vestigial Sideband Modulation (VSB) is used for video modulation in TV transmission due to the following reasons:

  • A workable compromise between the spectrum-conserving characteristics of single-sideband modulation and the demodulation simplicity of double-sideband amplitude modulation is found in the vestigial-sideband modulation.
  • Video signal exhibits a large bandwidth and significant low-frequency content which suggests the use of VSB.  

The spectrum of a vestigial sideband is as shown:

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Test: VSBSC (Vestigial Sideband Suppressed Carrier) - Question 3
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A VSB transmitter that transmits 25% of the other sideband along with the wanted sideband radiates 0.625 kW when the modulation percentage is 60%. If we want to transmit the same message by an AM transmitter then the carrier power (in kW) required is 

Detailed Solution: Question 3

Concept:
VSB modulation is the process where a part of a signal called vestige is modulated along with one of the sidebands.
A VSB signal is plotted as shown in the following figure:

A guard band is a very small frequency width used to avoid interference.
The mathematical representation of the VSB wave is:

Vm, q = Quardature component of Vm.
fc = Carrier frequency

Power relation in VSB wave:

F = represents a fraction
K = modulation index


Calculation:
Given that:
PVSB = 0.625, K = 60% = 0.6, F = 25% = 0.25
PC = ?
Then:

Option (2) correct.

Test: VSBSC (Vestigial Sideband Suppressed Carrier) - Question 4
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Vestigial sideband is most commonly used in-

Detailed Solution: Question 4

VSB (vestigial sideband) transmission transmits one sideband fully and the other sideband partially thus, reducing the bandwidth requirement.
Vestigial Sideband Modulation (VSB) is used for video modulation in TV transmission due to the following reasons:

  • Video signal exhibits a large bandwidth and significant low-frequency content which suggests the use of VSB.  
  • VSB (vestigial sideband) transmission transmits one sideband fully and the other sideband partially thus, reducing the bandwidth requirement.
  • The circuitry for demodulation in the receiver should be simple and therefore cheap. VSB demodulation uses simple envelope detection.
     

The spectrum of a vestigial sideband is as shown:

Test: VSBSC (Vestigial Sideband Suppressed Carrier) - Question 5
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The frequency response H(ω) of a VSB filter is shown below.

Find the VSB signal XVSB(t) when m(t) = a1 cos ω1t + a2 cos ω2t

Detailed Solution: Question 5

Concept:
VSB (vestigial sideband) transmission transmits one sideband fully and the other sideband partially thus, reducing the bandwidth requirement.
The spectrum of a vestigial sideband is as shown:

Analysis:
xDSB(t) = m(t) cos ωct
= [a1 cos ω1t + a2 cos ω2t] cos ωct
= a1 cos ω1t cos ωct + a2 cos ω2t cos ωct
= a1/2 [cos (ωc - ω1)t + cos (ωc + ω1)t] + a2/2 [cos (ωc - ω2)t + cos (ωc - ω2)t
so, these are the sinusoids that passes through H(ω) and are having gains
0.25, 0.75, 0, 1
∴ xDSB(t) = (a1/8) cos(ωc - ω1)t + (3a1/8) cos(ωc + ω1)t + 0 + (a2/2) cos(ωc + ω2)t

Test: VSBSC (Vestigial Sideband Suppressed Carrier) - Question 6
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Modulation system used for video modulation in TV transmission is

Detailed Solution: Question 6

In TV Transmission the use of FM is made for Audio transmission and AM for Video transmission.
Vestigial Sideband modulation (VSB) is used for video modulation in TV transmission due to the following reasons :

  • Video signal exhibits a large bandwidth and significant low-frequency content which suggests the use of VSB.  
  • VSB (vestigial side band) transmission transmits one side band fully and the other side band partially thus, reducing the bandwidth requirement.
  • The circuitry for demodulation in the receiver should be simple and therefore cheap. VSB demodulation uses a simple envelope detection.

Test: VSBSC (Vestigial Sideband Suppressed Carrier) - Question 7
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When bandwidth is the major consideration a narrow and wide band FM can be approximated to?

Detailed Solution: Question 7

For narrow and wide bands frequency modulation, modulation index is respectively smaller and greater than 1. When bandwidth is considered it can be approximated to AM.

Test: VSBSC (Vestigial Sideband Suppressed Carrier) - Question 8
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In television transmission, the type of modulation used for video is

Detailed Solution: Question 8

In TV Transmission the use of FM is made for Audio transmission and AM for Video transmission.
Vestigial Sideband Modulation (VSB) is used for video modulation in TV transmission due to the following reasons :

  • Video signal exhibits a large bandwidth and significant low-frequency content which suggests the use of VSB.  
  • VSB (vestigial sideband) transmission transmits one sideband fully and the other sideband partially thus, reducing the bandwidth requirement.
  • The circuitry for demodulation in the receiver should be simple and therefore cheap. VSB demodulation uses simple envelope detection.

The spectrum of a vestigial sideband is as shown:

Test: VSBSC (Vestigial Sideband Suppressed Carrier) - Question 9
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Which modulation is used in microwave band?

Detailed Solution: Question 9

In pulse modulation, message signal in the form of pulses are varied with respect to width, amplitude or position. It is mostly used for radio navigation, microwave band and for many others.

Test: VSBSC (Vestigial Sideband Suppressed Carrier) - Question 10
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Signal to quantization noise ratio in PCM system depends on _________

Detailed Solution: Question 10

Pulse code modulation (PCM) is a digital form of communication. For demodulation of PCM, it is necessary to convert it into PAM. Quantization noise occurs in PCM only. Signal to quantization noise ratio depends on the number of quantization levels.

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About this Electronics and Communication Engineering (ECE) Practice Test

This test contains 10 MCQs on VSBSC (Vestigial Sideband Suppressed Carrier) 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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