Direction: The item consists of two statements, one labelled as 'Statement (I)' and the other as 'Statement (II)'. You are to examine these two statements carefully and select the answers to these items using the code given below.

Statement (I): A popular method for generating a VSB modulated wave is to use the frequency discrimination method.

Statement (II): One of the sidebands is partially suppressed and a vestige of the other sideband is transmitted to compensate for that suppression.

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UPSC ESE (Prelims) Electronics and Telecommunication Engineering 19 Feb 2023 Official Paper
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  1. Both Statement (I) and Statement are individually true and Statement (II) is the correct explanation of Statement (I)
  2. Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)
  3. Statement (I) is true but Statement (II) is false
  4. Statement (I) is false but Statement (II) is true

Answer (Detailed Solution Below)

Option 4 : Statement (I) is false but Statement (II) is true
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Detailed Solution

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Here, statement 1 is not correct. Mention the frequency discrimination method as a popular method for generating a VSB (Vestigial Sideband) modulation wave. However, this is not accurate. The frequency discrimination method is not commonly used for generating VSB modulated waves.

Statement 2 is correct. It describes a method where one sideband is partially suppressed, and a vestige of the other sideband is transmitted to compensate for the suppression. This is a correct description of how VSB modulation is achieved. While statement 1 is false, statement 2 accurately explains the process of VSB modulation.

Here, option 4 is correct.  

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