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Test: Communication System- 3 - Electrical Engineering (EE) MCQ


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25 Questions MCQ Test - Test: Communication System- 3

Test: Communication System- 3 for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Communication System- 3 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Communication System- 3 MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Communication System- 3 below.
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Test: Communication System- 3 - Question 1

Which one of the following statements is correct?

Noise has the greatest effect in a communication system when it interferes with the signal

Test: Communication System- 3 - Question 2

The spectral density and autocorrelation function of white noise is

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Test: Communication System- 3 - Question 3

The power spectral density increases as frequency decreases for

Test: Communication System- 3 - Question 4

The spectral density of white noise

Test: Communication System- 3 - Question 5

Which one of the following types of noise gains importance at high frequency

Test: Communication System- 3 - Question 6

For a message signal m(t) = cos (2πfmt) and carrier of frequency fc, which of the following represents a single sideband (SSB) signal

Test: Communication System- 3 - Question 7

Which one of the following is represented by v(t) = 5[cos (106 π t) – sin (103 π t) × sin(106 π t)]

Test: Communication System- 3 - Question 8

The bandwidth requirement of AM wave is

Test: Communication System- 3 - Question 9

Which of the following modulated signals can be detected by an envelope detector

Test: Communication System- 3 - Question 10

Which of the following desirable features are possessed by SSB in comparison to AM

1. Less power is required

2. Bandwidth required is less

3. Antenna size can be reduced

4. Low frequency can be used

Select the correct answer using the codes given below:

Test: Communication System- 3 - Question 11

One of the advantage of base modulation over collector modulation of a transistor Class C amplifier is

Test: Communication System- 3 - Question 12

A modulated signal is given by,

s(t) = m1(t) cos (2 π fct) + m2(t) sin (2 π fct)

where the baseband signal m1(t) and m2(t) have bandwidths of 10 kHz and 15 kHz respectively. The bandwidth of the modulated signal, in kHz, is

Test: Communication System- 3 - Question 13

In a low level modulation AM system, the amplifiers following the modulated stage can be

Test: Communication System- 3 - Question 14

In a 100% amplitude modulated signal, if the total transmitted power is P, then carrier power will be

Test: Communication System- 3 - Question 15

In AM, the percentage of total power in sideband is

Test: Communication System- 3 - Question 16

In an amplitude modulated system, if the total power is 600 W and the power in carrier is 400 W, then the modulation index is

Test: Communication System- 3 - Question 17

The modulation index of an AM is changed from 0 to 1. How does the transmitted power change

Test: Communication System- 3 - Question 18

A 10 kW carrier is sinusoidally modulated by two carriers corresponding to a modulation index of 30% and 40% respectively. The total radiated power is

Test: Communication System- 3 - Question 19

In an AM signal when the modulation index is one, the maximum power Pt (where Pc is the carrier power) is equal to

Test: Communication System- 3 - Question 20

An amplitude modulated signal is [A + 0.5 A ] cos wct where wm and wc are respectively, modulating and carrier frequencies. The power efficiency is

Test: Communication System- 3 - Question 21

The maximum power efficiency of an AM modulator is

Test: Communication System- 3 - Question 22

A carrier is amplitude modulated by 4 signals of frequency 10 kHz, 15 kHz, 20 kHz and 25 kHz. What is the bandwidth of the modulated signal

Test: Communication System- 3 - Question 23

VSB modulation as compared to SSB modulation, for band occupies

Test: Communication System- 3 - Question 24

Which of the following analog modulation scheme requires the minimum transmitted power and minimum channel bandwidth

Test: Communication System- 3 - Question 25

In frequency modulation

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