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Chapter 20: Problem 2743

In modulation process radio signal is called (A) modulating wave (B) Carrier wave (C) modulated wave (D) transmitting wave

Short Answer

Expert verified
In the modulation process, a low-frequency message signal (modulating wave) is superimposed on a high-frequency carrier signal (carrier wave). The resulting wave after the modulation process is called modulated wave. Thus, the radio signal in the modulation process is referred to as (B) Carrier wave.

Step by step solution

01

Concept of Modulation

In the modulation process, a low-frequency message signal (also known as the modulating signal) is superimposed on a high-frequency carrier signal. This process alters the characteristics of the carrier wave according to the message signal. The resulting modulated wave is then transmitted over long distances using an antenna.
02

Understanding the Options

Now, let's analyze the given options and match them with the concepts of modulation: (A) Modulating Wave: This refers to the low-frequency message signal that we want to transmit. (B) Carrier Wave: This is the high-frequency signal that is used to carry the modulating signal. (C) Modulated Wave: This is the final wave that is generated after the modulation process, which contains both the message and carrier signals. (D) Transmitting Wave: This term may refer to a signal that is being transmitted, but it isn't specific to the radio signal in the modulation process.
03

Identifying the Correct Option

From our discussion of the different terms related to the modulation process, it is clear that the radio signal in the modulation process is actually the high-frequency signal used to carry the message signal. Therefore, the correct answer is: (B) Carrier wave

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Most popular questions from this chapter

For AM, value of modulation index should be always \((\mathrm{A})<1\) (B) \(=1\) (C) \(>1\) (D) 0

If the band width is \(1.6 \times 10^{12} \mathrm{~Hz}\), how many communication channels can be obtained with \(16 \mathrm{KHz}\) band width radio signal ? (A) \(10^{15}\) (B) \(10^{11}\) (C) \(10^{10}\) (D) \(10^{8}\)

In frequency modulation (A) the amplitude of modulated wave varies as frequency of carrier wave. (B) the frequency of modulated wave varies as amplitude of modulating wave. (C) The amplitude of modulated wave varies as amplitude of carrier wave. (D) The frequency of modulated wave varies as frequency of modulating wave.

If ' \(\mathrm{fm}^{\prime}\) is the modulation frequency in FM the modulation index is proportional to (A) \(\mathrm{fm}\) (B) \(\mathrm{f}_{\mathrm{m}}^{2}\) (C) \(\left(1 / \mathrm{f}_{\mathrm{m}}\right)\) (D) \(\left(1 / \mathrm{f}_{\mathrm{m}}^{2}\right)\)

In the following question from statement-1 (Assertion) is followed by statement-2 (Reason) Each question has the following four choice out of which only one choice is correct (a) Statement- 1 is true, statement \(-2\) is true. Statement \(-2\) is a correct explanation for statement-1. (b) Statement-1 is true, statement-2 is true, statement-2 is not a correct explanation for statement-1. (c) Statement- 1 is true, statement \(-2\) is false (d) Statement-1 is false, statement \(-2\) is true. Statement-1 :- sky wave communication is not suitable for frequencies greater than \(30 \mathrm{MHz}\). Statement \(-2:-\) High frequency signals die out before reaching the ionosphere. (A) a (B) \(b\) (C) \(c\) (D) \(\mathrm{d}\)
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